#composite design pattern java example

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Composite Pattern Tutorial Explained with Java Example | Composite Pattern Vs Inheritance

Full Video link https://youtu.be/Dzg9ZMuQFHc Hello friends, #Compositepattern video in #Java #Design #Pattern is published on #codeonedigest #youtube channel. This video covers topics 1. What is #Compositedesignpattern? 2. What is the use of Composite

Composite design pattern allows different objects in a similar fashion. Using composite design pattern, we can treat single object or composition of objects uniformly Composite pattern is a type of structure design pattern which describe how classes and objects are related. This is a best tutorial of Composite design pattern with the Java example. ** Topics Covered ** 1. Recap of Bridge Design…

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Learning Design Patterns in Programming

Design patterns are reusable solutions to common software design problems. Whether you're a beginner or an experienced developer, learning design patterns can greatly improve your ability to write clean, scalable, and maintainable code. This post introduces the concept of design patterns, why they're important, and how you can start using them effectively in your projects.

What Are Design Patterns?

A design pattern is a proven way to solve a specific problem in software design. These patterns are not code snippets but templates or best practices that guide developers in structuring their programs.

Why Use Design Patterns?

Code Reusability: Promotes the use of reusable solutions.

Scalability: Makes it easier to scale applications.

Maintainability: Leads to cleaner and more organized code.

Team Collaboration: Helps teams follow a shared vocabulary and approach.

Problem Solving: Speeds up decision-making by providing tried-and-tested approaches.

Categories of Design Patterns

Creational Patterns: Focus on object creation mechanisms (e.g., Singleton, Factory).

Structural Patterns: Deal with object composition (e.g., Adapter, Decorator).

Behavioral Patterns: Manage communication and behavior (e.g., Observer, Strategy).

Common Design Patterns Explained

1. Singleton Pattern

Ensures a class has only one instance and provides a global access point to it.// Singleton in Java public class Database { private static Database instance; private Database() {} public static Database getInstance() { if (instance == null) { instance = new Database(); } return instance; } }

2. Factory Pattern

Creates objects without exposing the instantiation logic to the client.// Factory Example in Python class ShapeFactory: def get_shape(self, type): if type == 'circle': return Circle() elif type == 'square': return Square()

3. Observer Pattern

Defines a one-to-many dependency so that when one object changes state, all its dependents are notified.

4. Strategy Pattern

Allows algorithms to be selected at runtime by defining a family of interchangeable behaviors.

5. Decorator Pattern

Adds new functionality to objects dynamically without changing their structure.

Best Practices for Learning Design Patterns

Start with the basics: Singleton, Factory, and Observer.

Understand the problem each pattern solves.

Use real-world examples to grasp each pattern.

Refactor your existing code using design patterns where applicable.

Don't force patterns—use them where they naturally fit.

Resources for Learning

Refactoring Guru – Visual and code-based examples.

SourceMaking – Classic explanations.

Java Design Patterns GitHub Repo

Book: Design Patterns: Elements of Reusable Object-Oriented Software by the "Gang of Four".

Conclusion

Design patterns are a powerful tool for developers at all levels. They provide a structured approach to solving common programming problems and help build applications that are easier to manage and extend. Start small, practice often, and soon you'll be writing better code with confidence.

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Inheritance in OOP: Concepts and Applications

In the realm of computer science, particularly in object-oriented programming (OOP), inheritance is a core principle that enables developers to create new classes based on existing ones. This mechanism promotes code reusability, simplifies maintenance, and enhances system architecture, making it a cornerstone concept in modern software development.

Inheritance allows a class, known as a subclass or derived class, to inherit properties and behaviors (methods) from another class, called the superclass or base class. This relationship enables subclasses to utilize existing code, extending or modifying it without altering the original source. For instance, if a base class defines a general "Vehicle" with properties like speed and color, subclasses such as "Car" or "Bike" can inherit these properties while introducing their unique attributes or methods.

In practice, inheritance is implemented through syntax specific to each programming language. For example, in Java, it is achieved using the `extends` keyword, while in Python, it involves defining the subclass with the parent class in parentheses. Despite syntactic differences, the underlying concept remains consistent across languages.

One of the primary advantages of inheritance is the facilitation of polymorphism, another foundational OOP concept. Polymorphism allows objects to be treated as instances of their parent class, enabling generic programming and dynamic method binding. This flexibility supports the design of scalable and adaptable systems capable of handling various object interactions seamlessly.

However, inheritance is not without challenges. Overusing or improperly implementing it can lead to complex and tightly coupled hierarchies 横浜 相続, making code difficult to manage or extend. This issue is sometimes addressed through alternative design patterns, such as composition, which involves building classes by assembling objects from other classes rather than inheriting from them.

When used effectively, inheritance enhances code readability and reduces redundancy, pivotal for managing larger projects. Developers can conveniently introduce new functionalities or modify existing systems by extending base classes without extensive rewriting. Moreover, it encourages the use of abstract classes and interfaces, promoting more organized and structured codebases.

In conclusion, inheritance in OOP is an indispensable tool that empowers developers to create robust, maintainable, and efficient software. By leveraging existing code structures, it streamlines development processes and fosters system scalability, underscoring its vital role in the evolving landscape of software engineering.

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ALL ABOUT DESIGN PATTERN

A design pattern [1,2] is a specific method to solve a specific object-oriented software problem, realizing a more simple and convenient reuse of successful designs and architectures. Design patterns are widely used in the modern software industry to reuse best practices and improve the quality of software systems [3]. Nowadays, software engineers have a greet tendency to use design patterns (DPs) because they are considered to have an important role in software engineering in the sense that they can make the understanding of nonentities easier [4]. When a software is conducted, it needs to be carefully architected and designed to get benefitted from the inherent features of software quality [5].

Software design patterns have a considerable impact on the software development life cycle [6]. According to Dave Cohen a developer who find design pattern intriguing, the applicability at the third level (feature) is the “sweet spot.” They shine at encapsulating business logic, memory management, server calls, and much more [7]. Creational Design Pattern is an unlimited scope to recreate Geographical Area Objects without restrictions, developers would use different types of creational design patterns to cook an object in an orderly and sophisticated manner [8]. Structural design patterns focus on organizing classes and objects [9] to form larger, more flexible software structures. These patterns facilitates the composition of objects and define relationships between them to achieve system structural integrity. By emphasizing object composition, inheritance, and interface implementation, structural patterns promote code reusability, and maintainability, and scalability [10]. Multiple research papers involving Behavioral design pattern [11] which have been proven of how have it became an important form in addressing major societal challenges.

Recent studies on design patterns 202-2024 underscore their significant role in enhancing software quality, adaptability, and performance. For instance, a systematic review highlights how design patterns can improve code readability, maintainability, and reusability, which are crucial for larger, object-oriented systems​ [12]. This is especially relevant in modern domains like microservices and machine learning applications, where modularity and scalability are essential. Research indicates that design patterns offer effective architectural solutions, particularly in complex systems with high performance and reliability demands. For example, in microservice-based architectures, design patterns support optimal resource use and scalability by structuring system components to handle increasing workloads efficiently [13].

To discover more about design pattern, here are some sites for you to learn them:

References:

Naghdipour, A., Hasheminejad, S., Keyvanpour, M.R. DPSA. A Brief Review for Design Pattern Selection Approaches. In Proceedings of the 2021 26th International Computer Conference: Computer Society of Iran (CSICC), Tehran, Iran, 3–4 March 2021; pp. 1–14. https://ieeexplore.ieee.org/abstract/document/9420629

Ohstuki, M.; Kakeshita, T. Generating Relationship between Design Pattern and Source Code. In Proceedings of the 13th International Conference on Computer Supported Education, Prague, Czech Republic, 23–25 April 2021; pp. 288–293. https://www.scitepress.org/PublishedPapers/2021/104725/104725.pdf

Wang, L., Song, T., Song, H., & Zhang, S. (2022). Research on Design Pattern Detection Method Based on UML Model with Extended Image Information and Deep Learning. Applied Sciences, 12(17), 8718. https://doi.org/10.3390/app12178718

Yarahmadi, H.; Hasheminejad, S. Design pattern detection approaches: A systematic review of the literature. Artif. Intell. Rev. 2020, 53, 5789–5846. https://link.springer.com/article/10.1007/s10462-020-09834-5

Rana, M.E, Saleh, O.S. Chapter 15 - High assurance software architecture and design. In Emerging Methodologies and Applications in Modelling, System Assurances, Academic Press, 2022, Pages 271-285, ISBN 9780323902403. https://www.sciencedirect.com/science/article/pii/B9780323902403000151

Barmaki, R., Hasheminejad,S., Naghdipour, A. (2023). Software design pattern selection approaches: A systematic literature review.https://www.researchgate.net/publication/366827284_Software_design_pattern_selection_approaches_A_systematic_literature_review

Cohen D. (2021). INTRODUCTION TO DESIGN PATTERNS: WHY THEY'RE WORTH LEARNING. Tech Design Patterns. https://www.scraggo.com/design-patterns-intro/

Okeyo, B. (2024). Creational Design Pattern. https://www.billyokeyo.com/posts/creational-design-pattern/

Ngaogate W. (2023). Applying the Flyweight Design Pattern to Android Application Development. ASEAN Journal of Scientific and Technological Reports 26(2):49-57. https://www.researchgate.net/publication/369544605_Applying_the_Flyweight_Design_Pattern_to_Android_Application_Development

Aratchige, R.M, Guratne, M. Kariyawasam, K. Weerasinghe, P.N. (2024). An Overview of Structural Design Patterns in Object-Oriented Software Engineering. https://www.researchgate.net/publication/377969013_An_Overview_of_Structural_Design_Patterns_in_Object-Oriented_Software_Engineering

Khadilkar, P.R, Cash, P. (2020). Understanding behavioral design: barriers and enablers. Journal of Engineering Design. https://www.tandfonline.com/doi/full/10.1080/09544828.2020.1836611#d1e126

Software-Engineering design patterns for machine learning applications. (2022). IEEE Journals & Magazine | IEEE Xplore. https://ieeexplore.ieee.org/document/9734272

Meijer, W., Trubiani, C., & Aleti, A. (2024). Experimental evaluation of architectural software performance design patterns in microservices. Journal of Systems and Software, 218, 112183. https://doi.org/10.1016/j.jss.2024.112183

A song about Design Pattern:

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Generative AI: Revolutionizing Art, Music, and Content Creation

AI has been utilized in the past to comprehend and suggest information. Generative AI can now assist us in producing original content. Large language models (LLMs), which are trained on vast volumes of text to anticipate the next word in a phrase, are one example of an existing technology that is expanded upon by generative AI. For instance, "jelly" is more likely to come after "peanut butter and ___" than "shoelace". In addition to producing fresh text, generative AI may also produce graphics, movies, and audio. Discover the innovative ways that Google teams are using generative AI to produce new experiences.

Generative AI: Revolutionizing Art, Music, and Content Creation

Because generative AI allows computers to produce code, music, artwork, content, and emotional support, it has completely changed the IT sector as well as every other business. In the twenty-first century, artificial intelligence techniques have made it possible to successfully complete nearly any human work.

Introduction to Generative AI

Artificial intelligence that can produce text, graphics, and other kinds of material is known as AI-generated art. Its democratization of AI—anyone may utilize it with as little as a text prompt or a sentence written in natural language—makes it an amazing tool. To achieve anything valuable, you don't need to learn a language like Java or SQL; all you need to do is speak your language, specify what you want, and an AI model will provide a proposal. This has enormous applications and an influence since it allows you to generate or comprehend reports, develop apps, and much more in a matter of seconds.

Another name for it is generative adversarial networks (GANs), which are a branch of artificial intelligence that concentrates on producing fresh, unique material. In order to create new data based on patterns and examples from previous data, machine learning in creativity model must be trained. Generative AI may be used to produce original and inventive works of Digital art, designs, and even music in the context of art and design.

Generative AI in Art

When it comes to Generative design and art, AI-generated art has several benefits. First of all, by giving them fresh concepts and inspiration, it may assist designers and artists in getting beyond creative obstacles. Because the algorithms may produce a vast array of options, artists are free to experiment and explore new avenues.

Second, by automating some steps in the creative algorithms, generative AI can assist save time and effort for artists. For instance, generative AI algorithms in graphic design enable artists to rapidly iterate and improve their work by producing several versions of a generative design based on a set of criteria.

Generative AI does, however, have inherent limits in the fields of design and art. The fact that algorithms are only as accurate as the data they have been taught on is one of the primary obstacles. The resulting output might be biased or lack diversity if the training data was skewed or had a narrow scope. This may result in less inventiveness and uniqueness in the created designs or artwork.

A Few Groundbreaking Uses of AI-generated art in the Creative Sector:

The renowned AI picture "Edmond de Belamy" brought in $432,500 at Christie's auction. The world can benefit from artificial intelligence, as demonstrated by this remarkable achievement that pushes the field to new heights.

DeepDream is a computer vision application that uses various creative algorithms to produce hallucinogenic pictures.

Generative AI in Music

Pattern recognition is how generative AI in music production finds patterns in already-existing musical data. It then creates new music with a similar sound by using these patterns. In addition, AI systems may be trained to generate music that is in sync with the styles of certain performers.

AI music compositions are capable of producing a vast variety of music, including modern and classical genres. It is capable of producing music in a variety of moods, including melancholy and joyful. It may also produce anything from basic loops to whole songs by combining different instrumentation techniques.

The use of this innovative technology in music creation has several benefits. The primary benefit is in helping musicians rapidly and easily come up with fresh musical ideas. This can be especially beneficial for artists who are trying to experiment with new musical genres or who are having writer's block.

Additionally, AI music composition can assist musicians in creating more individualized and customized songs to suit their own interests and preferences. For example, artificial intelligence systems may be trained to produce fresh content according to each individual's taste or style of music.

A Few Groundbreaking Uses of Generative AI in music production

Artificial intelligence-generated recordings featuring the genres of jazz and classical music have been produced by OpenAI's MuseNet. This provides fresh and imaginative compositions for a range of uses.

Suno AI is an AI platform for creating music videos that produces melodies and songs that sound authentic. With the help of this program, users may write lyrics for their songs and instantly create realistic, catchy music with a single click.

Generative AI in Content Generation

A formidable area of artificial intelligence called "generative AI" has enormous promise to address a wide range of problems that businesses around the globe are facing. It is capable of producing new material rapidly using a range of multi-modal inputs. These models may take text, photos, video, music, animation, 3D models, and other kinds of data as inputs and outputs.

Both major corporations and startups may quickly extract knowledge from their private databases by using generative AI. For instance, you may create unique apps that expedite the creation of content for internal creative teams or external clients. This might involve producing on-brand films that fit the story of your company or summarizing source information to create fresh images.

Simplifying the creative process is one of the main advantages. Additionally, generative AI offers extensive information that helps you identify underlying patterns in your processes and datasets. Companies can replicate difficult scenarios and lessen model bias by adding more training data. In today's fast-paced, dynamic industry, this competitive edge creates new avenues for optimizing your current creative workflows, enhancing decision-making and increasing team productivity.

Several Groundbreaking Uses of Generative AI in Content Generation:

With the ability to write news articles, develop creative marketing campaigns, and even write the screenplays for films and TV shows, tools like GPT-4 and ChatGPT 4o have revolutionized the creation of content. These tools demonstrate how artificial intelligence can support and improve content strategy.

Many video generating applications allow users to create realistic-looking films with simple text inputs. For example, Synthesia, Steve.AI, Veed.IO, and several more technologies produce inventive and lifelike videos that simultaneously create new avenues for creativity and chances.

Conclusion:

Anyone can now more easily communicate their ideas thanks to generative AI, which is revolutionizing the way we produce music, art, and entertainment. For authors, singers, and painters, the possibilities are unlimited since computers can now create original, creative creations. Creativity is no longer constrained by knowledge or ability thanks to instruments that only need a brief stimulus.

It's critical to be aware of generative AI's limitations, like as bias in training data, as it develops. But the advantages—like time savings and creative inspiration—are changing the creative industry. Generative AI is here to stay, opening doors to a more creative future through its ability to create captivating images and melodies. Accept this fascinating technology and see how it might improve your artistic endeavors!

FAQ:

What is Generative AI, and how does it work?

AI that generates new material by utilizing preexisting data is known as generative AI. According to the patterns it detects, it generates outputs using techniques similar to neural networks.

How is Generative AI used in Digital art and music creation?

It inspires original ideas and helps artists get beyond creative hurdles. In music, it creates creative compositions by dissecting the structures and genres of already-written songs.

What are the ethical concerns surrounding Generative AI?

Copyright violations, prejudice in content generation, problems with authenticity, and the possibility of abuse—such as fabricating false information or deepfakes—are some ethical concerns.

Can Generative AI replace human creativity?

No, because generative AI lacks human experience and emotional depth, it cannot completely replace human creativity. It serves as an instrument to stimulate and advance human creativity.

What does the future hold for Generative AI in creative industries?

Future prospects are bright, as generative AI is expected to improve teamwork, optimize processes, and stimulate creativity in music, art, and video production.

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Sequence Diagram For Library Management System Ppt

Sequence And Collaboration Diagram Of Library Management System Collaboration Diagram Library Management System ERD Entity Relationship Diagrams, ERD Software for Mac and Win. When it comes to system construction, a class diagram is the most widely used diagram. UML Class Diagrams is a type of static structure diagram that is used for general conceptual modeling of the systematics of the application. Such a diagram would illustrate the object-oriented view of a system. The object orientation of a system is indicated by a class diagram.

Examples by Technology or Application Domain

Online shopping UML diagrams Ticket vending machine UML diagrams Bank ATM UML diagrams Hospital management UML diagrams Digital imaging and communications in medicine (DICOM) UML diagrams Java technology UML diagrams Application development for Android UML diagrams Software licensing and protection using SafeNet Sentinel HASP security solution

Examples by Types of Diagrams

Activity diagram examples Class diagram examples Communication diagram examples Component diagram examples Composite structure diagram examples Deployment diagram examples Information flow diagram example Interaction overview diagram examples Object diagram example Package diagram examples Profile diagram examples Sequence diagram examples

State machine diagram examples Timing diagram examples Use case diagram examples

Use Case Diagrams

Business Use Case Diagrams

Airport check-in and security screening business model

Restaurant business model

System Use Case Diagrams

Ticket vending machine

Bank ATM UML use case diagrams examples

Point of Sales (POS) terminal

e-Library online public access catalog (OPAC)

Online shopping use case diagrams

Credit card processing system

Website administration

Hospital Management

Radiology diagnostic reporting UML use case diagram example

Software protection and licensing UML use case diagram example

Information Flow Diagrams

Scheduled Workflow information flow for the IHE Radiology Technical Framework

Class Diagrams

Abstract Factory Design Pattern

Domain Models

Library domain model

Bank account class diagram example

Online shopping domain model

Health insurance policy UML class diagram example

Digital imaging in medicine - DICOM model of the real world

Sentinel HASP software licensing domain UML class diagram example

APIs

Digital imaging in medicine - DICOM Application Hosting API

Java util.concurrent API UML class diagram examples

Implementation Models

Android Camera implementation classes

Sentinel HASP licensing UML class diagram of Aladdin package

Object Diagrams

Web application Login Controller object diagram

Composite Structure Diagrams

Bank ATM UML composite structure diagram example

Apache Tomcat 7 web server UML composite structure diagram example

Observer design pattern as UML collaboration use example

Package Diagrams

Multi-Layered Application Model

Multi-Layered Web Architecture

Java™ Platform Standard Edition 7 API UML package diagram example.

Java Servlet 2.5 API UML package diagram example

Java Servlet 3.0 API UML package diagram example

Spring and Hibernate ORM data access packages and classes

(Data) Transfer Object (Value Object) design pattern package template

Component Diagrams

Online shopping component diagram

Sentinel HASP licensing components

Deployment Diagrams

Online shopping web application manifestation

Online shopping web application UML deployment diagram

Clustered deployment of J2EE web application

Multilayered load balancing of J2EE servers

Apple iTunes UML deployment diagram

Android application deployment

Network Diagrams

Home network diagram example

Web application network diagram example

Profile Diagrams

Service Oriented Architecture Modeling Language (SoaML) UML profile diagram examples

Java Enterprise JavaBeans (EJB) 3.0 UML Profile

Digital Imaging and Communications in Medicine (DICOM) UML profile diagram example

Activity Diagrams

Business flow - Process purchase order

Business flow - Document management process

Electronic prescription service

Software design - Resolve software issue

Software licensing - activation of Sentinel HASP SL provisional product UML activity diagram example

Online shopping UML activity diagram

Ticket vending machine

Web security - Single Sign-On (SSO) for Google Apps

State Machine Diagrams

Water Phase Diagram as State Machine

Bank ATM behavioral state machine UML diagram example

Online shopping user account UML state machine diagram example

Java Thread states and life cycle UML protocol state machine example

Java EJB life cycle of a session object UML state machine example

Digital Imaging and Communications in Medicine (DICOM) Hosted Application life cycle UML protocol state machine example

Sequence Diagrams

Online bookshop UML sequence diagram

Submit comments to Pluck using DWR, AJAX, JSON

Facebook user authentication in a web application

Spring and Hibernate transaction management

Timing Diagrams

Medical domain - Stages of Alzheimer’s disease UML timing diagram example

Web user experience - Website latency UML timing diagram example

Communication Diagrams

Online bookshop communication diagram

Interaction Overview Diagrams

Online shopping interaction overview diagram

Management Information System Ppt

Submit comments to Pluck using DWR, AJAX, JSON

UML use case diagrams are one of professional uml diagrams for library management systems.

Library management system is an enterprise resource planning system, usually used in public and corporate libraries, academic as well as government libraries, developed to handle basic housekeeping functions of a library. It helps to provide information on any book present in library to the users as well as staff member. It also keeps a track of book issued, returned and added to library.

UML use case diagram is one of uml diagrams which aims to gather requirements of a system, get an outside view of a system, identify internal and external factors influencing the system and show the interacting among the requirements are actors.

5 Steps to Create UML Diagrams for Library Management Systems

Sequence Diagram For Library Management System Ppt Download

Cryptomator nextcloud add. Edraw is such a professional and smart UML diagram software which enables users to be hands-free and finish following steps with just several clicks.

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Run Edraw, navigate to Software and double click UML model diagram to open a blank drawing page.

Drag relevant UML symbols from left libraries and drop on the drawing page.

Double click the symbols to add information and finish typing by click any blank area on the page.

Drag proper connector from left libraries to connect symbols.

Click Save on File tab to save the diagram as the default format .eddx. Choose Save as on File tab to save as other formats. You can choose to save in local files or save in your Cloud. You can also hit Export & Send under File to export the uml diagram as images, ppt , web documents and so on.

Below is the created UML diagram for library management systems.

EdrawMax: a swiss knife for all your diagramming need

Effortlessly create over 280 types of diagrams.

Provide various templates & symbols to match your needs.

Drag and drop interface and easy to use.

Customize every detail by using smart and dynamic toolkits.

Compatible with a variety of file formats, such as MS Office, Visio, PDF, etc.

Feel free to export, print, and share your diagrams.

Software to Create UML Use Case Diagram

Edraw UML Diagram Software almost makes everything ready and users need not to do too much that’s why it stands out from so many diagram programs.

It provides a mass of standard UML symbols for users to drag-and-drop and does not require any drawing skills.

It also offers abundant UML templates for users to download free and edit contents to get a new diagram within several clicks.

It supports inserting data by adding hyperlinks, note, and attachments to make UML diagrams more resourceful and interesting.

More UML Diagrams Types

Order Management System Ppt

Edraw UML diagram software is not only professional for creating UML use case diagrams, but also powerful in creating UML state chart, UML class diagram, UML deployment diagram, UML package diagram, UML component diagram, UML activity diagram, and etc.

UML Class Diagram

Sequence Diagram For Library Management System Ppt

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Amazon DynamoDB single-table design using DynamoDBMapper and Spring Boot

A common practice when creating a data model design, especially in the relational database management system (RDMS) world, is to start by creating an entity relationship diagram (ERD). Afterwards, you normalize your data by creating a table for each entity type in your ERD design. The term normalization refers to the process of organizing the columns (attributes) and tables (relations) of a relational database to minimize data redundancy. The practice of creating ERDs works even with NoSQL database systems such as Amazon DynamoDB. The patterns provided by modules such as Spring Data, which is used by Spring Boot based application for data access, still heavily depend on these patterns from the RDMS world. However, normalizing your data in this way doesn’t yield optimal results when you’re using a nonrelational database. Relational databases use joins to combine records from two or more tables, but those joins are expensive. However, DynamoDB does not support joins. Instead, data is pre-joined and denormalized into a single-table. This blog post shows how to implement an ERD design by using a single-table design approach instead of using multiple tables. We use the higher-level programming interface for DynamoDB called DynamoDBMapper to demonstrate an example implementation based on Spring Boot. Solution overview In this post, we use the Ski Resort Data Model that is provided as an example in NoSQL Workbench for DynamoDB. This example model provides several entities and defines the following access patterns: Retrieval of all dynamic and static data for a given ski lift or overall resort, facilitated by the table SkiLifts Retrieval of all dynamic data (including unique lift riders, snow coverage, avalanche danger, and lift status) for a ski lift or the overall resort on a specific date, facilitated by the table SkiLifts Retrieval of all static data (including if the lift is for experienced riders only, vertical feet the lift rises, and lift ride time) for a certain ski lift facilitated by the table SkiLifts Retrieval of the date of data recorded for a certain ski lift or the overall resort sorted by total unique riders, facilitated by the SkiLifts table’s global secondary index SkiLiftsByRiders With dynamic and static data in a single table, we can construct queries that return all needed data in a single interaction with the database. This is important for speeding up the performance of the application for these specific access patterns. However, there is a potential downside, the design of your data model is tailored towards supporting these specific access patterns. Which could conflict with other access patterns, making those less efficient. Because of this trade-off it’s important to prioritize your access patterns and optimize for performance as well as cost based on priority. To apply the single-table design successfully in your application, you need to understand your application’s data access patterns. Access patterns are dictated by your design, and using a single-table design requires a different way of thinking about data modeling. You can learn more about this pattern from the AWS re:Invent 2020 talks from Alex DeBrie (AWS Data Hero), Data modeling with DynamoDB – Part 1 and Data modeling with DynamoDB – Part 2. Additionally, Amazon DynamoDB Office Hours with Rick Houlihan (senior practice manager at AWS) are a great source of information that include examples of modeling real-world applications. Usually, you don’t know all the access patterns beforehand. Iterate your design and continue to improve it before actually putting the application into use. In this blog post’s example application, we use the following stack: Amazon Corretto 11, the no-cost, multiplatform, production-ready distribution of the Open Java Development Kit (OpenJDK) Spring Boot version 2.4, Spring’s convention-over-configuration solution for creating stand-alone, production-grade Spring-based applications Apache Maven, a software project management and comprehension tool Amazon DynamoDB Local, the downloadable version of DynamoDB you can use to develop and test applications in your development environment AWS SDK for Java v1, specifically for the higher-level programming interface for DynamoDB, which is called DynamoDBMapper Project Lombok, a java library that reduces boilerplate code by using annotations in your classes JUnit 5, unit testing framework for Java based applications The first iteration of our data model is shown in the following table. Primary Key Attributes PK SK Date Total Unique LiftRiders Average Snow Coverage Inches Avalanche Danger Open Lifts Experienced Riders Only Vertical Feet Lift Time Lift Number RESORT_DATA DATE#07-03-2021 07-03-2021 7788 50 HIGH 60 RESORT_DATA DATE#08-03-2021 08-03-2021 6699 40 MODERATE 60 RESORT_DATA DATE#09-03-2021 09-03-2021 5678 65 EXTREME 53 LIFT#1234 STATIC_DATA TRUE 1230 7:00 4545 LIFT#1234 DATE#07-03-2021 07-03-2021 3000 60 HIGH OPEN LIFT#1234 DATE#08-03-2021 08-03-2021 3500 50 MODERATE OPEN LIFT#6789 STATIC_DATA FALSE 2340 13:00 1122 LIFT#6789 DATE#08-03-2021 08-03-2021 4000 60 MODERATE OPEN LIFT#6789 DATE#09-03-2021 09-03-2021 2000 88 EXTREME OPEN This table uses the DynamoDB concept called composite primary key. A composite primary key is composed of two attributes. The first attribute is the partition key (PK) and the second attribute is the sort key (SK). DynamoDB uses the partition key’s value as input to an internal hash function. The output from the hash function determines the partition (physical storage internal to DynamoDB) in which the item will be stored. All items with the same partition key value are stored together, in sorted order by sort key value. The values for the partition key and sort key in this table start with a prefix like #, which makes values easier to understand. Such a prefix also allows you to create simple queries on the sort key that filter on items starting with a certain prefix. Prerequisites for this solution For this walkthrough, you should have the following prerequisites: Java Development Kit (JDK), such as Amazon Corretto installed, version 11 or higher Apache Maven, which you can install locally or use the Maven wrapper that is provided with the example project Implementing the solution We focus on two access patterns in this post and provide integration tests that demonstrate the functionality by using DynamoDB Local. Integration tests provide examples that can be a good starting point when you plan to implement a similar access pattern in your own application. We focus on the following two patterns: Retrieval of all dynamic and static data for a given ski lift or overall resort. Retrieval of the date of dynamic data recorded for a certain ski lift or the overall resort sorted by total unique riders. To make this query efficient, we use a global secondary index on the DynamoDB table. Follow these steps to create an environment in which to test these access patterns: Create the Spring Boot application. Add domain classes, providing a mapper between Java POJOs and the DynamoDB model. To reduce the amount of boilerplate code we need to write, we use Project Lombok annotations to generate most of this code. Add integration tests to validate the access patterns by using DynamoDB Local. The example project can be found in this GitHub repo. Using the combination of Spring Boot with Project Lombok is common practice, because the use of Project Lombok minimizes boilerplate code and thereby improves the developer productivity in creating Spring Boot based applications. The Spring Data model is often used for accessing databases. Implementing the data access layer of your application without Spring Data and instead using the higher-level programming interface provided by the AWS SDK for Java has some advantages. For example, you can create a dedicated project for data access, allowing you to not only use this library in your Spring Boot applications but also in other plain Java code. Creating your domain classes that provide the mapping between the application logic and DynamoDB is easier when you combine Project Lombok and the AWS SDK for Java. The following code example demonstrates how to use the Project Lombok annotations and DynamoDBMapper annotations together to create a Java POJO representing the static lift stats domain class. The Project Lombok annotations minimizes the boilerplate code and the DynamoDBMapper annotations provide a mapping between this class and its properties to tables and attributes in DynamoDB. For example the @DynamoDBHashKey and @DynamoDBTable annotations allows DynamoDBMapper to link the getPK() method to the partition key in the table SkiLifts. @AllArgsConstructor @Builder @Data @DynamoDBTable(tableName = "SkiLifts") @NoArgsConstructor public class LiftStaticStats { @DynamoDBAttribute(attributeName = "ExperiencedRidersOnly") private boolean experiencedRidersOnly; @DynamoDBAttribute(attributeName = "VerticalFeet") private int verticalFeet; @DynamoDBAttribute(attributeName = "LiftTime") private String liftTime; @DynamoDBAttribute(attributeName = "LiftNumber") private int liftNumber; @DynamoDBHashKey(attributeName = "PK") public String getPK() { return "LIFT#" + liftNumber; } @DynamoDBRangeKey(attributeName = "SK") public String getSK() { return "STATIC_DATA"; } } The following code block creates a QueryRequest expressing to DynamoDB that we want all data from the table that share the same partition key represented by the attribute liftPK. The result of this request is retrieved from DynamoDB by performing a query: AttributeValue liftPK = new AttributeValue("LIFT#" + liftNumber); QueryRequest queryRequest = new QueryRequest() .withTableName("SkiLifts") .withKeyConditionExpression("PK = :v_pk") .withExpressionAttributeValues(Map.of(":v_pk", liftPK)); QueryResult queryResult = amazonDynamoDB.query(queryRequest); The results of this query can contain items of different types of objects, both LiftDynamicStats and LiftStaticStats objects. The DynamoDBMapper class isn’t suited to implement this query because its typed methods don’t allow for a query result that contains different types of objects. However, for this access pattern it is important to retrieve the data set containing different types of objects with just one query to DynamoDB. Because the QueryRequest and QueryResult classes are able to deal with query results containing different types of data objects, using the QueryRequest and QueryResult classes is the best alternative for implementing this query. Second access pattern Our second access pattern is the retrieval of the date of dynamic data recorded for a certain ski lift or the overall resort sorted by total unique riders. We need to sort this data by the number of unique riders, but the table design doesn’t facilitate an easy query for such a use case. For this reason, we introduce a global secondary index to support our access pattern. The partition key (PK) remains the same, but we use the total unique riders property as the sort key (SK). Do we need more data for this access pattern? Yes: the date, but other attributes aren’t relevant, so those are not included in global secondary index. The following table provides some example data in which the items are sorted by the total unique lift riders. Primary Key Attributes PK SK TotalUniqueLiftRiders Date RESORT_DATA TOTAL_UNIQUE_LIFT_RIDERS#7788 7788 07-03-2021 RESORT_DATA TOTAL_UNIQUE_LIFT_RIDERS#6699 6699 08-03-2021 RESORT_DATA TOTAL_UNIQUE_LIFT_RIDERS#5678 5678 09-03-2021 LIFT#1234 TOTAL_UNIQUE_LIFT_RIDERS#3500 3500 08-03-2021 LIFT#1234 TOTAL_UNIQUE_LIFT_RIDERS#4000 4000 08-03-2021 LIFT#6789 TOTAL_UNIQUE_LIFT_RIDERS#3000 3000 07-03-2021 LIFT#6789 TOTAL_UNIQUE_LIFT_RIDERS#2000 2000 09-03-2021 With just one query, it’s very easy to get a list for a specific lift sorted by the total unique lift riders. The only additional data retrieved by this query is the date. The integration test in the project called GlobalSecondaryIndexTestIT.testRetrieveDateOfLiftDataSortedByTotalUniqueLift() implements this scenario. See the following code, in which we use the DynamoDBMapper to query the global secondary index using an expression that will only return objects of the type LiftDynamicStats: List results = mapper.query(LiftDynamicStats.class, new DynamoDBQueryExpression() .withConsistentRead(false) .withExpressionAttributeValues( Map.of(":val1", new AttributeValue().withS("LIFT#" + lift1))) .withIndexName("GSI_1") .withKeyConditionExpression("GSI_1_PK = :val1")); Run tests in the project by using Maven To run our tests, we run the following command in the root folder of the project: ./mvnw clean verify The output shows the results of running the tests, including access to DynamoDB Local. The test results are not that important. We used these tests to demonstrate how different access patterns can be implemented and thereby providing a starting point for integrating the single-table design in Java applications. You also can find the test results in /target/surefire-reports/. Summary This post showed how to complement the functionality provided by the AWS SDK for Java with the functionality provided by Project Lombok. Such an approach allows for an efficient programming model in Spring Boot–based applications as well as any other Java application. Furthermore, you can extend the same concept in this post to simple functions, including AWS Lambda functions. Within a project, you can use this data access layer in applications based on Spring Boot and deployed on Amazon Elastic Container Service (Amazon ECS) on AWS Fargate. Similarly, you can use the data access layer within the same project in smaller scoped functions deployed as lightweight Lambda functions. This way, you can avoid the added overhead of Spring Boot. This is one of the main advantages of using the components provided by the AWS SDK for Java instead of implementations based on modules such as Spring Data. This post’s example project demonstrates functionality by using DynamoDB Local, but also provides a great stepping stone to start developing your own Java-based applications and functions. About the author Arjan Schaaf is a cloud infrastructure architect at AWS Professional Services, based in the Netherlands. He helps customers solve complex challenges by providing solutions that use AWS services. When not working, Arjan likes Alpine activities, backyard BBQ, and spending time with family and friends. https://aws.amazon.com/blogs/database/amazon-dynamodb-single-table-design-using-dynamodbmapper-and-spring-boot/

[delicatepersonpeach]

How significant is JavaScript for Modern Web Developers?

The significance of JavaScript as a web innovation can be resolved from the way that it is as of now utilized by 94.5%, everything being equal. As a customer side programming language, JavaScript causes web engineers to make pages dynamic and intuitive by carrying out custom customer side contents. Simultaneously, the designers can likewise utilize cross-stage runtime motors like Node.js to compose worker side code in JavaScript. They can even consolidate JavaScript, HTML5 and CSS3 to make site pages that look great across programs, stages, and gadgets. There are additionally various reasons why every advanced web engineer should realize how to use all advantages of JavaScript.

Why No Web Developer can Create Modern Web Applications without JavaScript?

Carry out Client-Side Scripts

JavaScript was initially planned as a customer side scripting language. A huge level of sites actually use JavaScript as a customer side programming language. The web engineers can undoubtedly compose custom customer side contents in JavaScript, and coordinate the contents consistently into HTML. They can additionally utilize JavaScript to make the pages intelligent, react to clients instaneously, and make more extravagant UIs, without less worker connection and lessens worker load.

Compose Server-Side Code

The web designers can likewise compose worker side code in JavaScript by utilizing a cross-stage runtime motor like Node.js. Node.js is planned as a cross-stage and worker side runtime climate. It further executes the JavaScript code proficiently through Google V8 JavaScript motor. The implicit libraries given by Node.js further permit software engineers to run their web applications easily without depending on outer web workers. Consequently, the web designers can utilize Node.js to compose both customer side and worker side code in JavaScript.

Improve on Complex Web Application Development

In spite of being a deciphered programming language, JavaScript improves on advancement of complex web applications by permitting engineers to work on the application's sythesis. The developers can utilize JavaScript libraries to make shadow DOM limits. As well as improving on the web application's construction, the shadow DOM further decouples parts of individual JavaScript libraries. The shadow DOM further make internet browsers convey archives with generally utilized HTML labels like div, select and input.

MEAN Stack

The engineers can additionally work on advancement of current web applications by exploiting four segments of MEAN stack — MangoDB, Express.js, Angular.js and Node.js. MangoDB is an advanced and schemaless NoSQL information base, while Angular.js is a well known JavaScript structure upheld by Google. Simultaneously, Node.js is a cross-stage and worker side runtime climate, though Express.js is planned with highlights to improve on advancement of single-page and different pages sites. The four parts of MEAN stack empower designers to compose both front-end and back-finish of a site in JavaScript. Nonetheless, segments of MEAN stack are as yet interoperable.

Responsive Web Design

Most engineers these days embrace responsive website architecture to make a site open and look great across numerous programs, gadgets and programs. Responsive website composition empowers designers to advance a site for the two PCs and cell phones with a solitary code base. In any case, the engineers need to join CSS3, HTML5 and JavaScript to make the site pages responsive. Subsequently, the designers should utilize JavaScript to advance pages for cell phones.

Google AMP Project

Google has started the Accelerated Mobile Pages (AMP) venture to make sites that convey more extravagant client experience across changing cell phones. Google has consolidated a few enhancement procedures to speed up portable pages straightforwardly. In any case, it expects engineers to coordinate AMP innovation into the site pages through HTML5, CSS3 and JavaScript. Consequently, the developers need to utilize JavaScript while improving sites for cell phones with AMP.

Numerous Transpilers

JavaScript is a lightweight programming language. It does not have a portion of the hearty highlights given by current programming dialects like Java and C#. Be that as it may, the web designers can undoubtedly broaden JavaScript by utilizing a transpilers like CoffeeScript, TypeScript, DukeScript and Vaadin. Each transpiler empowers engineers to meet the prerequisites of enormous undertaking application by making the work process complex.

Changing Libraries and Frameworks

The web engineers can without much of a stretch expand the usefulness of JavaScript by utilizing various libraries and systems. The completely includes JavaScript libraries like AngularJS and Ember empower JavaScript web designers to add usefulness to complex web applications without composing extra code. Simultaneously, lightweight JavaScript libraries like React.js make it simpler for software engineers to achieve explicit assignments. The designers can additionally utilize open source devices like NPM to introduce and deal with all JavaScript libraries utilized by a web application productively.

Continues To develop

As referenced before, JavaScript does not have a portion of the high level highlights given by present day programming dialects like multithreading capacity and record read/compose alternative. Be that as it may, the programming language has been advancing reliably to meet the arising patterns in web application improvement. For example, ECMAScript 6, the most recent variant of JavaScript improves on present day web application advancement by giving a few new classes, modules, module loaders, generators and images, alongside Unicode uphold and reflect API.

The advanced web engineers should utilize JavaScript to cause their web applications to convey ideal client experience across different gadgets, working frameworks, and programs. Nonetheless, they should be comfortable with different JavaScript libraries, systems, and devices. They can even consolidate different libraries and structures to improve and stretch out JavaScript as per necessities of huge tasks.

[profoundballoonanchor]

Across Arrow

Arrows Across America Map

Navigation Arrows Across America

Across Arrow

In general, a thinner arrow promotes speed and straight flight as it faces less wind resistance. Arrows with smaller diameters are also known to be more effective at penetrating game. Straightness: You'll see the straightness of an arrow listed with figures like +/.003, +/.006, etc. The lower the number, the straighter the arrow is.

Well organized and easy to understand Web building tutorials with lots of examples of how to use HTML, CSS, JavaScript, SQL, PHP, Python, Bootstrap, Java and XML.

All arrows pointed east on the west-east airways and north on the south-north airways. They were built between December 1926 and November 1932, when metal arrows became the standard. Each photo is a link to a webpage with more photos and information about that site, including the gps location. A copy and paste arrows symbols & arrows signs collection for easy access. Just click on an arrow symbol to copy it to the clipboard and paste it anywhere. Please also also check out our font keyboard to help users easily get fonts right at the phone keyboard at. The Executioner carbon crossbow arrow was designed for superior performance, bringing you speed, kinetic energy, and accuracy. All 20' and 22' fletched arrows will come with 3' Bohning X Vanes; All 18' fletched arrows will come with 2' Blazer Vanes; Comes with both Half Moon and Flat Nocks - Pressed Fit; Executioner Brass Inserts Installed.

Nature Sport Central is reader supported and may earn a commission through affiliate links.

Before you settle for a particular crossbow bolt brand, here are some things to always bear in mind:

Ensure that you use broadheads and field points of identical weight and that this weight is precisely the same as that of the heads you got with bolts that came with your crossbow.

Do not ever use arrow heads and arrow shafts lighter than your manufacturer’s recommended limit. Using heavier ones isn’t an issue, but lighter ones essentially mean that you’re dry-firing your crossbow, which will render its warranty void, lead to it malfunctioning, and cause you possible injury.

The majority of crossbow packages will come only with bolts that have target practice field points. Broadheads you’ll probably have to buy on your own.

Using heavier arrows than is recommended doesn’t carry any risk with it, but do bear in mind that it will bring down the FPS (velocity) output of your compound crossbow.

Here are a couple of the best carbon arrows for compound crossbows that you might want to take a look at:

Carbon Express PileDriver Fletched Carbon Crossbolt Review

These Carbon Express arrows will provide you with the best penetration since they’re made from heavier carbon that results in the most kinetic energy, possibly at bone crushing levels! The advanced methods used in these surprisingly cheap carbon arrows’ construction yield superior accuracy because of the consistency of the spine, and also the more powerful knockdown.

The Crossbolt’s composite material retains its durability on impact, resulting in both reliability and consistency. 6 universal flat nocks, inserted moon nocks and standard 4-inch vanes are all part of the package with these bolts.

Carbon Express PileDriver Fletched Carbon Crossbolt with 4-Inch Vanes, 6-Pack

Designed for the hunter who wants ultimate penetration

Heaviest carbon crossbolt in CX lineup that creates maximum kinetic energy and great knock-down power

Advanced construction ensures spine consistency for greater accuracy; very durable at impact for exceptional reliability and repeat performance

Bolts come with standard 4' vanes, inserted moon nocks, plus 6 universal flat nocks (vane and nock color may vary from image)

Item specifications: Straightness: ± 0.004-Inch, Diameter: 0.348-Inch

The LAUNCHPAD™ Precision Nocks result in enhanced shaft alignment, controlled arrow release, and more consistent accuracy. Also included is a nock collar that acts as a protector for the shaft against nock-end impacts.

The front shaft section has BuffTuff® used on it, and the bolts feature Mossy Oak Brush pattern. Built-In Weight Forward™ technology is employed to give super down-range accuracy when using a broadhead. Each bolt is laser sorted to make sure that it is straight and consistent with each shot.

Black Eagle Executioner Crossbow Fletched Carbon Arrows/Bolts Review

Black Eagle’s Executioner arrows do indeed live up to their name. These crested carbon arrows are built for speed, kinetic energy, and accuracy. They feature Executioner brass inserts that give an overall weight for ideal forward of center (FOC).

This maximizes the arrow’s accuracy during its trajectory, without loss of speed or kinetic energy, resulting in a deadly output from your crossbow. Grouped Together Technology is employed to match the spines of every dozen crossbow bolts, resulting inconsistency.

Black Eagle Executioner Crossbow Fletched Carbon Arrows/Bolts

The Executioner carbon crossbow arrow was designed for superior performance, bringing you speed, kinetic energy, and accuracy.

All 20' and 22' fletched arrows will come with 3' Bohning X Vanes

All 18' fletched arrows will come with 2' Blazer Vanes

Comes with both Half Moon and Flat Nocks - Pressed Fit

Executioner Brass Inserts Installed

Each shaft is weighed and grouped to ensure that it is a perfect match. Black Eagle guarantees, at least, the straightness they’ve specified. The majority of the companies in this industry measure a 28’’ section, but Black Eagle Arrows measures the shaft’s full length.

These arrows come packaged with half-moon nocks as well as flat nocks. These bolts have nocks pressed to fit rather than glued onto them. Bohning vanes are also included.

Read more: Best Crossbow Scope

We have become so accustomed to modern avionics that we almost forget how wondrous GPS actually is, and perhaps even take it for granted. Talk to an old timer and he may tell you how impressed he was with LORAN when it came out. Of course the older guys will regale you with stories about VOR and NDB approaches and navigation.

But there are probably few people alive today that can talk about flying without radios at all. About 100 years or so ago, the US Department of Commerce established federal air routes, where pilots would look for large concrete arrows on the ground. These arrows were up to 70 feet long, usually painted yellow, and placed 10 to 15 miles apart. At 3000 feet, pilots could usually see from one to the other. Beacons were installed for night flight.

The purpose was to move the mail. Remember the airmail postage stamp? The United States Post Office Department issued the first airmail stamp in 1918 and it was a big deal to get mail bearing that stamp.

Arrows Across America Map

Where were they placed? Basically, all over the United States. You could fly from New York to San Francisco, simply following these large arrows. But then came the electronic age, and by the 1940s, the system was replaced by navigational radio systems. During World War II, numerous concrete arrows were destroyed as well – so as to not help enemy pilots visually navigate the country. The cool thing is, even though the system has it been out of use for over 70 years, you still find remnants all over the country, including here in South Carolina.

Navigation Arrows Across America

A visible arrow from Beacon 14, originally of the Atlanta–New York line, can be seen near Woodruff, SC. The arrow is also clearly visible in Google Street view, and, while slightly overgrown by vegetation, you can still see a concrete pad near Effingham.

Across Arrow

You can find more information here, here, and here.

[codeonedigest]

Server Side Page Fragment Composition Design Pattern for Microservices E... Full Video Link    https://youtu.be/RkghOb236u0Hello friends, new #video on #serversideuicomposition #page #frgament #composition #designpattern for #microservices #tutorial for #api #developer #programmers with #examples are published on #codeonedigest #youtube channel.  @java #java #aws #awscloud @awscloud @AWSCloudIndia #salesforce #Cloud #CloudComputing @YouTube #youtube #azure #msazure #codeonedigest @codeonedigest   #microservices #microservices #microservicesarchitecture #whataremicroservices #microservicestutorial #serversiderendering #serversiderenderingvsclientsiderendering #serversiderenderinginreactjs #serversiderenderingreactnextjs #serversiderenderingreactjs #serversideuirendering #serversidepagecomposition #microservicedesignpatterns #microservicedeploymentonkubernetes #microservicedesignpatternsspringboot #microservicedesignpatternsjava #designpattern

[thetechyafrolady]

DESIGN PATTERNS & DOUBLE DISPATCH

Just as there are many types of software available, there also exist multiple software patterns used when developing certain applications and systems. Software patterns, by definition, involve the various practices utilized when solving a recurring problem—usually in object-oriented systems—. A suitable software pattern, according to Jeff Friesen, must name and define the problem, give a solution to the problem, and list the disadvantages of the pattern. Of course, different patterns exist to solve different types of problems. The patterns can be broadly classified into four categories, collectively known as the “Gang-of-Four (GoF)”: creational patterns, structural patterns, behavioral patterns, and concurrency patterns. A few examples of these software patterns (arbitrarily listed) include iterator, double checked locking, blackboard, composite, and factory patterns.

In software development, there are two popularly used GoF patterns namely the strategy and visitor design patterns. To understand how these two patterns work, it is necessary to understand encapsulation —basically wrapping fields and methods (or behaviors) as classes— in java. A more detailed introduction to encapsulation can be found in this link. The main difference between the Strategy and Visitor patterns is that the Strategy Pattern will encapsulate a single group of similar methods/ behaviors, whereas the Visitor pattern will encapsulate numerous groups. With this distinction, the Visitor pattern is then best used for what is known as Double Dispatch.

Think of Single dispatch as the simplest case of java’s object oriented programming as shown in the figure below:

The output from the program will be:

In this short program, we created a class NarutoAnime with the method printInfo(). In the main method, we then made an instance of the class and called the printInfo() method. Now, if we had multiple classes all with a printInfo() method (say BAnime and CAnime), then at runtime, the type can be figured out to call the correct printInfo(). In the example above, Java knows to use n’s printInfo() and infers the reference at runtime, so it calls the correct printInfo() method.

With double dispatch, the visitor allows for adding operations to java classes without changing them. The runtime types of two objects are involved in a call. In other methods, we “choose” the method twice. We do this by simulating it using the “this” keyword. Now, take the following snippet of code into consideration:

Here, we create two instances of two separate classes and call the printInfo() method.

In the printInfo() method of the two classes, an Info object is passed. This object has the  showInfo() method, which is called by both classes. Notice that “this” is passed as a parameter.

In the Info() class, there are two methods with the same name, but different parameters relating to the intended class (Naruto or Akudama Drive). Thus, when the program runs, the following output is obtained (study carefully the role of the showInfo() method and “this”):

Thus, double dispatch (DD) is an interesting concept that is used in the design patterns. Note that whether a developer decides to use DD or not really depends on the problem to solve and how to go about solving it. Such decisions are crucial to enable a well-rounded and cooperative environment for software development.

[t-baba]

You say JavaScript, I say JS.. let's call the whole thing off?

#495 — July 3, 2020

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👴🏻 Just because I know you're not all as ancient as me, the subject line is a reference to an old Gershwin song 🎵😄

JS Weekly

JavaScript's Creator Recommends We Call JavaScript 'JS' — In response to a lively Twitter thread this week posing the question “If you were given the chance to rename JavaScript, what would you call it?” Brendan Eich wisely suggested, nay declared, we go with JS. While there’s an aspect of fun around this whole debate, it seems a sensible idea given JS has no relation to Java at all, although it might take us a while to rebrand ;-)

Twitter

A Brief Status Update on Vue 3.0 — The 18th beta of Vue 3.0 is out. Amongst other things, they’re targeting mid July for the first release candidate, then early August for the final Vue 3.0 release. You’re encouraged to start using it already though.

Evan You

Locate Front-End Issues Like JavaScript or Network Errors Instantly — Get proactively alerted on any client-side issues such as JavaScript and network errors, optimize the load time of your front-end resources, and detect any UI issues that affect critical user journeys. Try it free with Datadog Synthetics.

Datadog sponsor

▶  What’s New in V8 and JavaScript — A 20-minute talk from this week’s web.dev LIVE event that Google put on. The speakers cover a variety of new features and improvements to JavaScript generally as well as in V8 and Chrome.

Shu-yu Guo and Leszek Swirski (Google)

Announcing TypeScript 4.0 Beta — Last week we said the TS 4 beta was “due any moment” and last thing on a Friday was clearly the time to shine 😂 4.0 has no substantial breaking changes but there are lots of bits and pieces to play with including variadic tuple types, short-circuiting assignment operators, and editor improvements.

Daniel Rosenwasser (Microsoft)

V8 Release V8.4 — The next release of V8 (due to come out in coordinate with Chrome 84) boasts improved startup time, support for weak references and finalizers (worth seeing the code examples for these advanced features), and private methods and accessors.

Camillo Bruni

⚡️ Quick bytes:

Node 14.5 is out and includes a new experimental DOM-esque EventTarget API.

The JS2014 code golfing competition is open until July 15. You have to create something amazing in 1024 bytes (or fewer) of JavaScript.

Take care to not use the Internet Archive as a CDN for your JavaScript assets – obvious, perhaps, but a major British bank seems to have done just that 😄

💻 Jobs

JavaScript Developer at X-Team (Remote) — Join the most energizing community for developers and work on projects for Riot Games, FOX, Sony, Coinbase, and more.

X-Team

Find a Job Through Vettery — Use Vettery to connect with growing tech teams at startups and Fortune 500 companies.

Vettery

📚 Tutorials, Opinions and Stories

Understanding Template Literals — I really like Tania’s tutorials as they are both straightforward and thorough. Template literals are a piece of syntax (introduced in ES6/ES2015) worth understanding if you don’t use them yet.

Tania Rascia

The !! Operator and a Misunderstanding of How JS Handles Truthy / Falsy Values — Ben Nadel has noticed developers using the double-bang (!!) operator far more often in their JavaScript code than they have to. As such, he provides a series of unnecessary examples followed by cleaner, more intuitive examples.

Ben Nadel

CascadiaJS 2020 - An Online Conf for Web Devs That’s Actually Fun 🎉 — More than just a live stream, network and socialize with 1000+ fellow JS devs. Save 20% off with promo code JSWEEKLY.

CascadiaJS sponsor

▶  Low Code for the Node.js Developer with Node-RED — The project lead of Node-RED, a visual, Node-based ‘low code’ programming tool, talks about the concepts of ‘low code’ in the Node space and how Node-RED works.

Nick O Leary (IBM)

▶  The Bits And Bytes of Binary — Do you need to know the ins and outs of messing with binary in order to build a web app? No. But binary nonetheless runs the show at the low level, including in many algorithms, and this series from Low Level JavaScript covers the basics well.

Low Level JavaScript

Tips for Golfing in JavaScript — If you're thinking of entering JS1024 or otherwise want to take pleasure in crushing your JavaScript into as few bytes as possible, this collection of tips and tricks is for you. (Golfing is the art of representing an idea in as little code as possible.)

Stack Exchange

Continuous Deployment of Gatsby Apps to Heroku

CircleCI sponsor

An In-Depth Beginner's Guide to Testing React Apps — A lot of posts will say ‘in-depth’ and be 500 words long – this isn’t one of those! If you’re a beginner to testing, there’s a lot to chew on here but it stays accessible throughout.

Johannes Kettmann

Exploring the Web Speech API — One of those APIs I keep forgetting exists but with which you can do some pretty cool stuff.

James at De Voorhoede

TodoMVC Implemented Using a Game Architecture: ECS — Can you build more traditional GUIs with the Entity Component System as popular in game development? An interesting idea.

Andy Bulka

Getting Started with the Vue 3 Composition API

Joel Parks

🔧 Code & Tools

Vest: Effortless Validations Inspired by Testing Frameworks — If you’re used to unit testing, the syntax used here will be familiar.

Evyatar

React Hook Form 6.0: Simple, Extensible React Form Validation — Now with better TypeScript support, a smaller package size, and numerous refinements and improvements, RHF is certainly worth a look if you’re building or refactoring forms. GitHub repo.

Blue Bill

Stream Chat API & JavaScript SDK for Custom Chat Apps — Build real-time chat in less time. Rapidly ship in-app messaging with our highly reliable chat infrastructure.

Stream sponsor

Hyperapp: (Another) Tiny Framework for Building Web Interfaces — Claims to be 2x faster than React and comes in at less than 2KB.

Jorge Bucaran

Textures.js: SVG Textures for Data Visualization — Built on top of d3.js, this lets you bring together patterns and colors in an elegant and, dare we say, old school manner.

Riccardo Scalco

emoji-picker-element: A Lightweight Emoji Picker for the Modern Web — See a live demo here. Some cool performance advantages for this: It’s a web component and it’s built on Svelte and IndexedDB.

Nolan Lawson

🎨 Creative Corner

24a2: An Ultra-Minimalist Dot Matrix-Based Game Engine — What makes this different is that it has a limited set of features so you can build a game in a few hours. Here’s an example.

James Routley

PHONK: A Creative Scripting Toolbox for Android Devices — If you’ve got any old Android devices sat around, this could be a way to have some fun with them. It’s based around JavaScript.

Victor Diaz

parallax-effect: Parallax Effect in JavaScript using Face Tracking — A lot of designers seem to love parallax effects, whereas a lot of us end users aren’t so keen. But if you’re going to do it, do it in an over the top creative way like this 😂

munrocket

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[siva3155]

300+ TOP React Native Interview Questions and Answers

React Native Interview Questions for freshers experienced :-

1. What is React Native? React native is an open-source JavaScript framework designed by Facebook for native mobile applications development. It is based on a JavaScript library-React. React Native saves your development time as it enables you to build real and native mobile apps within a single language – JavaScript for both Android and iOS platforms, such that code once, run that on any platform, and the React Native App is ready for use with native look and feel. 2. Why use React Native? There is the following list of React Native features behind its use: Easy to use. Open-source framework Cross-platform compatibility Code Sharing Use a common language – JavaScript for cross-platform development. Faster Development Saves Time and efforts Gives Native look and feel 3. What are the advantages of React Native? React Native is based on “Learn Once Write Everywhere” approach to equip developers with a tool that only needs to be learned once, just in a single language and then can be reused on both iOS and Android mobile platform. React Native offers cross-platform development and a real experience to developers allowing them to build only one app with effectively 70% code sharing between different platforms. React Native helps in faster development. Building one app instead of two using a common language gives speedier app deployment, delivery, and quicker time-to-market. React Native exists with essential components for ending of native apps as the app development ends with native look and feel. React Native has a large community of developers for its security. The developers are always ready to fix bugs and issues that occur at any instant. They improve the performance of React Native from time to time with the best practices possible. React Native supports Live and Hot Reloading. Both are different features. Live Reloading is a tool that helps in compiling and reading the modified files. Hot Reloading is based on HMR (Hot Module Replacement) and helps to display the updated UI content. 4. List the essential components of React Native. These are the following essential components of React Native: View is the basic built-in component used to build UI. Text component displays text in the app. Image component displays images in the app. TextInput is used to input text into the app via the keypad. ScrollView is a scrolling container used to host multiple views. 5. What are the cons of React Native? React Native is still a new development platform as compared to iOS and Android platforms. It is still immature, i.e., in an improvement stage and impacting negatively on apps. Sometimes, React Native built-in apps face performance problem if there is a requirement of advanced functionality. In that case, they don’t perform well as compared to native apps. React Native has a steep learning curve for an average learner as it is not more comfortable in comparison to other cross-platform apps. It is because of existing JSX (JavaScript Syntax extension) in which HTML and JavaScript get combined and make learning challenging for average ones. React Native is based on JavaScript library which is fragile and creates a gap in the security robustness. As an expert’s point of view, React Native is not secure and robust for building highly confidential data apps like Banking and Financial apps. 6. How many threads run in React Native? There are two threads run in React Native: JavaScript thread Main UI thread 7. What are props in React Native? props pronounced as the properties of React Native Components. props are the immutable parameters passed in Presentational Component to provide data. 8. What are React Native Apps? React Native Apps are not web apps; they are the real and native mobile applications built-in a single language with the native components to run on mobile devices. 9. List the users of React Native? There are thousands of React Native built-in apps. Here is the list of those apps: Facebook Facebook Ads Manager Instagram F8 Airbnb Skype Tesla Bloomberg Gyroscope Myntra UberEats 10. For what purpose XHR module used in React Native? XHR module implements XMLHttpRequest to post data on the server.

React Native Interview Questions 11. Can we use Native code alongside React Native? Yes, we can use a native code alongside React Native for task completion, and several limitations can also overcome in previous versions like Titanium. 12. Are React Native built-in mobile apps like other Hybrid Apps which are slower in actual than Native ones? React Native designed as a highly-optimized performance-based framework that builds real mobile apps with native components. Facebook is the best-suited example of high performance based app built-in React Native. 13. What is the difference between React and React Native? React is a JavaScript library while React native is a framework based on React. js used for building UI and web applications while React Native is used for creating cross-platform native mobile apps. Both uses synonymous tags such as

are the tags in React.js and are the tags in React native. js uses DOM for path rendering of HTML tags while React Native uses AppRegistry for app registration. 14. What is the difference between React Native and Native Script? React Native uses only a single core development language- JavaScript while Native Script can use any of these languages- Angular, Vuejs, TypeScript, and JavaScript. React Native has faster development speed than Native Script. React Native exists with reusable components that developed at once can be used at different mobile platforms and accelerates mobile app development while Native Script exists with a less number of plugins among which some pass improper verification. React Native performs high as compared to Native Script. React Native is React based and uses virtual Dom for faster UI updation while Native Script uses slower Angulas, Vuejs, and TypeScript. Native Script exists with a box of various themes that shorten the gap between the different platform UIs while React Native doesn’t live with predefined themes; you get default look and feel by the devices. 15. Can we combine native codes of Android and iOS in React Native? Yes, we can do this as React Native fluently combines the components of both iOS and Android written in Swift/ Objective-C or Java. 16. What is the point of StyleSheet.create() in react native? In React Native, StyleSheet.create() send the style only once through the bridge to avoid passing new style object and ensures that values are immutable and opaque. 17. Why React Native has very clear animations? The animated API of React Native was designed as serializable so that users can send animations to native without going through the bridge on every frame. Once the animation starts, a JS thread can be blocked, and the animations will still run fluently. As the code converted into native views before rendering, the animations in React native will run smoothly, and the users get bright animations. 18. Differentiate between the React component and the React element. React component is a class or function that accepts input and returns a React element while React element displays the look of React Component Instance to be created. 19. Why React Native use Redux? Redux is a standalone state management library that React Native use to simplify data flow within an app. 20. Which node_modules will run in React Native? How to test for this? In React Native, node_modules as any pure JavaScript library that does not rely on Node.js runtime modules, and does not rely on web-specific concepts like window.location.pathname will run fine. But be conscious as there exists no way to test for this with Babel- it doesn’t scan these libraries for offending dependencies. A module that uses window.location.pathname may fail at runtime in a different unexpected place. 21. What is Virtual DOM and how it works in React Native? Virtual Dom is an in-memory tree representation of the real DOM with lightweight elements. It provides a declarative way of DOM representation for an app and allows to update UI whenever the state changes. Working Virtual DOM lists elements and their attributes and content. It renders the entire UI whenever any underlying data changes in React Native. Due to which React differentiates it with the previous DOM and a real DOM gets updated. 22. What is InteractionManager and what is its importance? InteractionManager is a native module in React native that defers the execution of a function until an “interaction” finished. Importance React Native has JavaScript UI thread as the only thread for making UI updates that can be overloaded and drop frames. In that case, InteractionManager helps by ensuring that the function is only executed after the animations occurred. 23. What is the point of the relationship between React Native and React? React is a JavaScript library. React Native is a framework based on React that use JavaScript for building mobile applications. It uses React to construct its application UI and to define application business logic. React updates a real DOM by tree diffing and allows React Native to work. 24. What are the similarities between React Native and React? React.js and React Native share same lifecycle methods like componentDidMount same state and prop variables same component architecture similar management libraries like Redux 25. Describe HOC. HOC (High Order Components) in React is the functional programming methodology for reusing component logic. takes a component as an argument and returns a new component It is a pattern evolved from React’s compositional nature to decompose the logic into simpler and smaller reusable functions. 26. Define Native apps. Native app is a software program for a specific mobile device that is developed on a particular platform in a specific programming language like Objective-C/Swift for iOS and Java for Android. It can use device-specific hardware and software as built on a particular device and its OS. It uses the latest technology such as GPS and provides optimized performance. 27. What are Hybrid Apps? Hybrid applications are the web applications developed through HTML, CSS, JavaScript web standards and wrapped in a native container using a mobile WebView object. These apps are easier to maintain. 28. What are refs in React? When to use Refs? Refs are escape hatch that provides a direct way to access DOM nodes or React elements created in the render method. Refs get in use when To manage focus, text selection, or media playback To trigger imperative animations To integrate with third-party DOM libraries 29. What does a react native packager do? A react native packager does a few things: It combines all JavaScript code into a single file It translates any JavaScript code that your device don’t understand (e.g., JSX or some of the newer JS syntax) It converts assets like PNG files into objects that can be displayed by an Image 30. What is NPM in React Native? npm installs the command line interface in React Native. npm install -g react-native-cli 31. What are “props” and “state”? “Props” and “state” are both plain JavaScript objects used to control data inside the components. props short for “properties.” Immutable parameters -> Unchangeable inside the component. Set by their parent and fixed for the whole lifetime of a component. Get passed to the Presentational component. state Mutable parameters -> Changeable inside the component. Get handled within the container component. Can’t be accessed and modified outside the component. 32. What is Style? The style prop is a plain JavaScript object use to making style of React Native application. There are two ways to style your element in React Native application. style property: adds styles inline. external Stylesheet: enables us to write concise code. 33. How To Handling Multiple Platforms? React Native smoothly handles multiple platforms. The large numbers of the React Native APIs are cross-platform so that one React Native component will work seamlessly on both iOS and Android. It provides the ways using which you can easily organize your code and separate it by platform: Platform module to detect the platform in which the app is running and platform-specific file extensions to load the relevant platform file. 34. When would you use a class component over a functional component? We use class component if our component has state or a lifecycle method(s). Otherwise, we use a Functional component. 35. How React Native handle different screen size? React Native offers many ways to handle different screen sizes: Flexbox Flexbox is designed to provide a consistent layout on different screen sizes. It offers three main properties: flexDirection justifyContent alignItems Pixel Ratio exists in the official documentation with the definition such that we can get access to the device pixel density by using PixelRatio class. We will get a higher resolution image if we are on a high pixel density device. An ethical principle is that multiply the size of the image we display by the pixel ratio. Dimensions easily handle different screen sizes and style the page precisely. It needs to write the code only once for working on any device. 36. Are all React components usable in React Native? Web React components use DOM elements to display (ex. div, h1, table, etc.), but React Native does not support these. We will need to find libraries/components made specifically for React Native. But today React is focusing on components that can be shared between the web version of React and React Native. This concept has been formalized since React v0.14. 37. What is the challenge with React Native? Working across separate Android and iOS codebases is challenging. 38. Does React Native use the same code base for Android and iOS? Yes, React Native uses the same code base for Android and IOS. React takes cares of the native components translations. For example A React Native ScrollView uses native ScrollView on Android and UiScrollView on iOS. 39. Thus React Native is a native Mobile App? Yes, React Native compiles a native mobile app using native app components. React Native builds a real mobile app that is indistinguishable from an app built using Objective-C or Java. 40. What is Gesture Responder System? The gesture responder system manages the lifecycle of gestures in the app. Users interact with mobile apps mainly through touch. They can use a combination of gestures, such as tapping on a button, zooming on a map, sliding on a widget or scrolling a list. The touch responder system is required to allow components to negotiate these touch interactions without any additional knowledge of their parent or child components. 41. How can React Native integrate more features on the existing app? React Native is great to start a new application from scratch. However, React Native works well to add new features to an existing native app. It needs some steps to add new React Native based features, screen, views, etc. The specific steps are different for different platform you’re targeting. Set up directory structure. Install JavaScript dependencies. Configuring permissions. Code integration. Test your integration. 42. What is the storage system in React Native? React Native uses AsyncStorage class to store data in key-value pair which is global to all app. AsyncStorage is a JavaScript code which is a simple, unencrypted, asynchronous and persistent. React Native also uses separate files for iOS and RocksBD or SQLite for Android. Using AsyncStorage class, you must have a data backup, and synchronization classes as data saved on the device is not permanent and not encrypted. 43. How React Native load data from server? React Native provides the Fetch API which deals networking needs. React Native uses componentDidMount lifecycle method to load the data from server. fetch('https://mywebsite.com/mydata.json') Other Networking libraries which interact with server are: XMLHttpRequest API WebSockets React Native Questions and Answers Pdf Download Read the full article

[janicecpitts]

Deck Addition

Contents

Deck. big blind

Outdoor living space

Remove snow. (4

Square metres (approximately

View an interactive chart with the resale value and average cost of a wood deck addition in this project outline from the Remodeling Cost vs. Value report.

The addition of the big blind ante may provide a clue as to WSOP’s future treatment of short deck. big blind ante was introduced on a trial basis in 2018 and then rolled out on a wider level in 2019. …

Surplus Building Supplies The municipal government holds a condominium in an Ironwood building at 8789 marsac ave. and is preparing to dispose of the property in what will

Mar 22, 2016 … Planning to add a deck to your home? These expert tips will help you with designing the perfect deck addition for your outdoor living space.

In Experiment 4, the events are non-mutually exclusive. The addition causes the king of clubs to be counted twice, so its probability must be subtracted.

A great addition to any garden the Java A great addition to any garden the Java storage box by Keter provides an ideal solution to store larger items securely and maintain your outdoor living space clutter-free. Featuring an oversized design the box will hold numerous items from gardening tools and pool equipment to cushions and toys.

Decks & Porches. remove snow. (4,255 projects). Average National Cost: $110. View Costs in Your Area. Decks & Porches. Build an Addition. (3,773 projects).

Wood Deck Ideas The heat lamp promises warmth on chilly nights and the floor cushions are great for extra lounge seating. The whitewashed wood deck keeps the tonal

In November 2017, the council discussed and cautiously supported the proposed roof deck addition. Even so, it prompted concerns among some council members — chiefly, Karen Holman and Lydia Kou — about …

Under the Building Code Act, a building permit is required for the construction of a new building, an addition, or alteration of any building or structure with a building area of over 10 square metres (approximately 108 square feet).The following list provides examples of common projects that require building permits. If the scope of your project does not appear on the list below or you are …

In addition, Trex RainEscape is easy and efficient to install on new decks and during deck resurfacing projects – making it an ideal solution for both contractors and do-it-yourselfers. The Trex RainE…

“You get no warranty on wood and it is higher maintenance, so why not change?” Barnds asked. The addition of a 16-by-20-foot composite deck in a simple linear pattern with a built-in bench and planter …

Our new version of the popular, 4 handed, double deck Pinochle is ready for a test drive. If you are a double deck player, you will enjoy this game.

Deck And Patio Contractors Building a porch or deck takes a decent amount of carpentry skills as well as knowledge of power tool use. For those unfamiliar with construction,

There are many rules associated with solving probability problems. This lesson deals with the addition rule. The addition rule helps you solve probability problems that involve two events. Even though we discuss two events (usually labeled A and B), we’re really talking about performing one task (rolling dice, drawing cards, spinning a spinner, etc.) and finding about the probability of two …

We recommend framing the new deck addition independently of the existing frame. In order to do this, you will need to install new beams and footings to support …

Exterior House Paint Dc Deck Building home improvement springfield Mo porch builders builders warehouse Kitchens The cafe, which counts Dan Jarvis and Dickie Bird amongst its regulars, is

via Check This Out More Resources

[ageloire]

The Beginner's Guide to Design Patterns

To fully understand the importance of design patterns, let's start with an example -- when a user uses your product, how do they save their landing page, blog post, template, etc.? Do their projects auto-save, or do they need to press a "Save" button?

Let's say you choose auto-save. Great. Now, how much time do you have? Do you want to go into each individual page and code for the auto-save component, with a big potential for error?

Or do you want to use a design pattern to ensure each of your website pages saves the same way, without tedious effort on your part?

That's the value of design patterns.

Here, we'll explain what design patterns are, and provide lists of design patterns in Java, C# and .Net, so you can save valuable time and effort on your next design project.

Design patterns explained simply

At its most basic, design patterns are solutions to recurring problems.

In the UX world, then, a design pattern is a pre-prescribed solution to a common design problem. Essentially, it's a way of saying, "Here's how we typically solve for this problem, if you want to use our method."

Chelsea Bathurst, a Design Lead at HubSpot, puts it this way: "Basically, components are the foundation -- how does this thing look. Design patterns are how they work together."

Design patterns are undeniably useful. They allow designers to avoid "re-inventing the wheel", and because they are tried-and-true solutions from experienced designers, they are less risky than creating something from scratch.

There are three types of design patterns: 

Creational design patterns: Regarding object creation mechanisms

Structural design patterns: Regarding Class and Object composition -- identifying relationships and patterns between components

Behavioral design patterns: Identifying communication patterns between Class objects

Next, let's take a look at our lists of design patterns in java, or C# and .NET, so you can begin applying them yourself. 

Design patterns in Java

Factory Pattern

Abstract Factory Pattern

Singleton Pattern

Prototype Pattern

Builder Pattern

Adapter Pattern

Bridge Pattern

Composite Pattern

Decorator Pattern

Facade Pattern

Flyweight Pattern

Proxy Pattern

Chain Of Responsibility Pattern

Command Pattern

Interpreter Pattern

Iterator Pattern

Mediator Pattern

Memento Pattern

Observer Pattern

State Pattern

Strategy Pattern

Template Pattern

Visitor Pattern

Design patterns in C# and .NET

Abstract Factory Pattern

Builder Pattern

Factory Method Pattern

Prototype Pattern

Singleton Pattern

Adapter Pattern

Bridge Pattern

Composite Pattern

Decorator Pattern

Facade Pattern

Flyweight Pattern

Proxy Pattern

Chain Of Responsibility Pattern

Command Pattern

Interpreter Pattern

Iterator Pattern

Mediator Pattern

Memento Pattern

Observer Pattern

State Pattern

Strategy Pattern

Template Pattern

Visitor Pattern

Once you understand the uses of each of these design patterns, you can choose which ones will best fit your needs. However, it's critical you understand basic java, or C# and .NET programming concepts, to correctly apply these solutions. If you don't, begin by taking an introductory course before taking any next steps with these design patterns.

from Marketing https://blog.hubspot.com/marketing/design-patterns

[lewiskdavid90]

80% off #From 0 to 1: Design Patterns – 24 That Matter – In Java – $10

An intensely practical, deeply thoughtful and quirky look at 24 Design Patterns. Instructors are ex-Google, Stanford.

All Levels,  – 11.5 hours,  63 lectures 

Average rating 4.2/5 (4.2 (100 ratings) Instead of using a simple lifetime average, Udemy calculates a course’s star rating by considering a number of different factors such as the number of ratings, the age of ratings, and the likelihood of fraudulent ratings.)

Course requirements:

There are no pre-requisites other than curiosity – about Design, about Patterns, about Life

Course description:

Prerequisites: Basic understanding of Java Taught by a Stanford-educated, ex-Googler, husband-wife team More than 50 real-world examples

This is an intensely practical, deeply thoughtful, and quirky take on 24 Design Patterns that matter.

Let’s parse that.

The course is intensely practical, bursting with examples – the more important patterns have 3-6 examples each. More than 50 real-world Java examples in total. The course is deeply thoughtful, and it will coax and cajole you into thinking about the irreducible core of an idea – in the context of other patterns, overall programming idioms and evolution in usage. The course is also quirky. The examples are irreverent. Lots of little touches: repetition, zooming out so we remember the big picture, active learning with plenty of quizzes. There’s also a peppy soundtrack, and art – all shown by studies to improve cognition and recall. Lastly, the patterns matter because each of these 24 is a canonical solution to recurring problems.

What’s Covered:

Decorator, Factory, Abstract Factory, Strategy, Singleton, Adapter, Facade, Template, Iterator, MVC, Observer, Command, Composite, Builder, Chain of Responsibility, Memento, Visitor, State, Flyweight, Bridge, Mediator, Prototype, Proxy, Double-Checked Locking and Dependency Injection. The only GoF pattern not covered is the Interpreter pattern, which we felt was too specialized and too far from today’s programming idiom; instead we include an increasingly important non-GoF pattern, Dependency Injection. Examples: Java Filestreams, Reflection, XML specification of UIs, Database handlers, Comparators, Document Auto-summarization, Python Iterator classes, Tables and Charts, Threading, Media players, Lambda functions, Menus, Undo/Redo functionality, Animations, SQL Query Builders, Exception handling, Activity Logging, Immutability of Strings, Remote Method Invocation, Serializable and Cloneable, networking. Dependency Inversion, Demeter’s Law, the Open-Closed Principle, loose and tight coupling, the differences between frameworks, libraries and design patterns.

Talk to us!

Mail us about anything – anything! – and we will always reply

Full details Identify situations that call for the use of a Design Pattern Understand each of 24 Design Patterns – when, how, why and why not to use them Distill the principles that lie behind the Design Patterns, and apply these in coding and in life, whether or not a Design Pattern is needed Spot programming idioms that are actually built on Design Patterns, but that are now hiding in plain sight

Full details Yep! Engineers – from street-smart coders to wise architects – ought to take this course. After this class, you’ll look at software design with a new pair of eyes. Yep! Product Managers ought to take this course – you will learn to understand the ‘how’ of Software Design without being constrained by it. Yep! Technology executives and investors who don’t write code ought to take this course – after this you will always have an intelligent point-of-view on software, and won’t find your eyes glazing over when its time to talk nitty-gritty Computer Science majors (undergrad or grad) – if you are among the folks that make ‘real world example Observer Pattern’ such a common search phrase on Google, this is precisely the place for you. Yep! Journalists, Wall Street types or IP lawyers seeking to understand recurring patterns of problems and solutions in technology. Yep! If you are prepping hard for software engineering interviews

Nope! This course is not right for you if you are looking for a Programming 101 course. That’s not because there are pre-requisites, but simply because a Programming 101 course focuses on syntax, and on doing, while this course focuses on design, and on thinking.

Full details

Reviews:

“While it is repetitious at times, a highly thought through and very well presented course.” (Phani)

“The detailed explanations were extremely helpful to get a grip on the patterns. Especially nice was that patterns were compared and put into the context of other patterns where appropriate, and that a limited set of examples were used under different perspectives. However, in the first place I had expected to see more concrete instructions how to implement the patterns from scratch. Nevertheless, the course was really cool, thnx :)” (Markus Lommer)

“One of the best Udemy course I’ve taken! The instructors are extremely knowledgeable, they understand that design patterns are not inherently trivial at first glance, and make the effort to break things down in a way that is easily accessible.” (Maurice McFarlane)

  About Instructor:

Loony Corn

Loonycorn is us, Janani Ravi, Vitthal Srinivasan, Swetha Kolalapudi and Navdeep Singh. Between the four of us, we have studied at Stanford, IIM Ahmedabad, the IITs and have spent years (decades, actually) working in tech, in the Bay Area, New York, Singapore and Bangalore. Janani: 7 years at Google (New York, Singapore); Studied at Stanford; also worked at Flipkart and Microsoft Vitthal: Also Google (Singapore) and studied at Stanford; Flipkart, Credit Suisse and INSEAD too Swetha: Early Flipkart employee, IIM Ahmedabad and IIT Madras alum Navdeep: longtime Flipkart employee too, and IIT Guwahati alum We think we might have hit upon a neat way of teaching complicated tech courses in a funny, practical, engaging way, which is why we are so excited to be here on Udemy! We hope you will try our offerings, and think you’ll like them

Instructor Other Courses:

Learn by Example: JUnit Loony Corn, A 4-person team;ex-Google; Stanford, IIM Ahmedabad, IIT (0) $10 $20 Under the Hood: How Cars Work 25 Famous Experiments …………………………………………………………… Loony Corn coupons Development course coupon Udemy Development course coupon Software Engineering course coupon Udemy Software Engineering course coupon From 0 to 1: Design Patterns – 24 That Matter – In Java From 0 to 1: Design Patterns – 24 That Matter – In Java course coupon From 0 to 1: Design Patterns – 24 That Matter – In Java coupon coupons

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