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redactedconcepts · 1 year ago

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JavaScript in the browser

Why JavaScript in the browser?

Now that we can structure the document and its content with HTML, and that we can style it in many ways with CSS, we may want to go beyond those capabilities (dynamically change the HTML document, perform some operations based on some current circumstances, …). JavaScript was created with exactly that goal in mind, and is still being used as such; its recent popular renewal as a language for scripts and web back-ends using Node.js is quite recent. All browsers expect HTML, CSS and JavaScript; Whatever you want to write for the web, even the most complex applications (even GMail, Google Maps, …) will have no choice but to be composed of those three technologies if they want to be understood by browsers.

A quick history to know where we come from

Note: the JavaScript language has nothing to do with the Java language. Please make sure not to use the wrong word!

Step 1: Browser War and standardization

Before the Browser War, the first “mainstream” browser was called Mosaic. It existed between 1993 and 1997 and had very limited features. Netscape released Netscape Navigator in 1995 in an attempt to shake things up and bring more features to the web experience. Quickly, Netscape Navigator had ~80% market share; but then quickly came Microsoft Internet Explorer 1.

The Browser War was a time when web browser market share was shared between Netscape Navigator and Microsoft Internet Explorer, and each browser was trying to one-up the other with fancy features for developers. It is a time that saw the birth of frames, CSS, and… JavaScript! Brendan Eich, back then a developer at Netscape, wrote the first version of JavaScript in 10 days (and it kinda still shows in the quirks of the language!), in order to ship it before Internet Explorer, with almost no documentation. People making websites were quick to use it to do nice things with Netscape Navigator, so Microsoft shipped a reverse-engineered version of it a few days later.

Of course, with this kind of approach, behavior in browsers were inconsistent, so Netscape ended up submitting the language for standardization with the ECMA, where it was given its actual name: ECMAscript (but everybody keeps saying JavaScript, so you should keep calling it that too).

Step 2: shy steps towards consistency

Netscape Navigator 5 was taking far too long to build because of heavy legacy issues, so Netscape decided to give it up and to prepare for Netscape Navigator 6, rebuilt entirely from the ground up. Rebuilding something this large entirely from the ground up is notoriously always a very bad decision in product management, and this occurrence didn’t fail the rule: Netscape disappeared for years while its browser took much longer than expected to be built, making a boulevard for Microsoft Internet Explorer to take virtually all of the market share.

The result for JavaScript is that for years, Microsoft didn’t follow through on their promise to make their version of JavaScript compatible with the ECMA standard. They had good reasons not to: since almost the entire planet was using their product, their incompatibility with other browsers was kind of a competitive advantage. Since developers who could only focus their efforts on one version of JavaScript were focusing on Microsoft Internet Explorer, their websites were effectively broken in other browsers.

This gave birth to Javascript libraries whose goals were to harmonize a single language API that worked in all browsers, such as JQuery (which comes with other features too).

Step 3: towards a more mature language

After years of JavaScript developers having to either produce one code per browser, or use libraries like JQuery, Microsoft’s strategy eventually caught up to them for two main reasons:

Rich front-end applications requiring heavy JavaScript became more and more mainstream, and Microsoft’s willful years of tardiness compared to other browsers led Internet Explorer (circa version 6, 7 and 8) to be much slower than the rest of the competition. People started to install other browsers in order to use comfortably their Gmail, Google Maps, etc.

Microsoft’s behavior was so obviously anti-constructive that they got a ton of lawsuits from competitors and from governments, most of which they lost. One of the most painful outcomes for them was the “ballot screen”: they had to display a screen on installation presenting their competing browsers to all of their European customers. This led European users to even more migrate to other browsers. This was a wake-up call for Microsoft, which reconsidered entirely their strategy, and came up with Internet Explorer versions (circa version 9 or 10) that were finally reasonably compatible with all relevant specs, and with JavaScript engine speeds comparable to their competitors. More recently, to make Internet Explorer and its terrible reputation a thing of the past, they have rebranded it as “Microsoft Edge”, and adopted a much more open strategy.

Microsoft 180-degre shift was immensely beneficial to JavaScript for browsers, since the same JavaScript code can now be ran transparently on all browsers with little risk; also, now that the whole industry is caught up, JavaScript’s pace of standardization for new features has dramatically increased within the past few years, and JavaScript is slowly becoming less and less like the quirky language that was created in 10 days as a marketing stunt in the mid-90s, and more and more like a modern, full-featured language.

JQuery & co

While JQuery’s syntax is very appreciated by developers, one of its obvious tradeoffs is one of performance: all of your users are loading and running a library bringing a ton of features, while you might only need a handful.

It used to make obvious sense up until recently, but JQuery’s two main upsides are now eroding:

It was immensely useful in writing code to safely work on all browsers; but now that Microsoft has caught up and is “fighting” for Microsoft Explorer < 9 to disappear from their clients’ computers, this has become less and less a problem as those browsers disappear.

Even today, it makes quite a few annoying and/or verbose Javascript syntaxes (such as making an Ajax call, or “selecting” an HTML element) much more developer-friendly. But for the newest versions of ECMAscript, many JQuery syntaxes have been used as inspiration and are directly offered in native “vanilla” JavaScript.

Even though JQuery is still heavily used in a lot of production websites, developers are much more prompt to reconsider using it in their websites if they only need a handful of features (see the website called “You might not need JQuery”, offering easy solutions in native “vanilla” JS to reproduce the most used features in JQuery).

A more lightweight and recent library that has been popular is Underscore.js, which was later forked as another project called lodash (got the pun?). It only attempted to make JavaScript’s syntax less verbose (and didn’t attempt to solve the browsers’ inconsistencies). Since they do not intend to tackle the differences between browsers, they are as relevant when using JavaScript in the browser as with Node.js. Maybe someday, ECMAscript will catch up to the syntactic sugar offered by Underscore and lodash, but waiting for this, they are quite popular today, and should remain so in the foreseeable future.

Some feats of JavaScript in the browser

Now that you’re amazingly comfortable with JavaScript in Node.js (!!!), you might wonder what the differences are between the JavaScript you’ve experienced there and the JavaScript you’re going to experience in the browser. Here are some differences:

The JavaScript version In Node.js, if a new version of JavaScript is stabilized, then you can update Node.js on your computer/server, and suddenly, you can use the latest fancy features of JavaScript. In the browser, you know nothing about the engine running your code, since it’s the user’s browser. They might be running a very old browser, that doesn’t understand the latest features. Therefore, most recent upgrades to JavaScript are not usable by front-end developers for months or years. Use the “Can I use?” website to find out what features are reasonably implemented by browsers.

The “special” objects The browser is giving you access to its features through a number of objects, like the window object, which represents the browser tab this code is running in, the navigator object, giving information about the browser used in general, etc. Most of those APIs are not standardized, but they are typically the same across browsers.

The DOM Standing for “Document Object Model”, the DOM is the HTML code as the browser “understands” it, i.e. as a tree. If you’re uncomfortable with why your browser thinks of your HTML code as a tree, you should read this: What is the Document Object Model?. The browser comes with the DOM API, which allows you to travel through the tree as needed: find elements in it, add or remove nodes, travel up or down the tree, … Those APIs are made available through the document object, representing the HTML document in which the code runs.

The event-orientation Since JavaScript in the browser is meant to perform actions when certain things happen, callbacks are not being run after I/O operations are performed like in Node.js, but when some events happen. Those events can be triggered by the user (a click on a button, the browser window being resized, …) or sometimes not (an image isn’t loading properly, the HTML webpage has finished loading, …)

Tools

You have many features in your browser’s dev tools meant to help you: a JavaScript console where you can run code that will directly apply to the webpage that is opened, a debugger allowing you to add breakpoints, etc. Take some time to get familiar with them…

#javascript #web

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fullstackmasters1 · 1 year ago

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What is FrontEnd Developer Course ?

Introduction :

Front-end developers focus on the visual and interactive aspects of a website, crafting the user interface and experience using technologies like HTML, CSS, and JavaScript. They design how a website looks and ensure it is responsive and engaging for users. On the other hand, back-end developers work behind the scenes, managing the server, databases, and application logic. They handle data storage, retrieval, and server-side operations, ensuring the functionality and security of the website or application. The collaboration between front-end and back-end developers is crucial for delivering a seamless and fully functional web experience.

Front-End Developer

1.Core Technologies:

HTML (Hypertext Markup Language):

HTML serves as the backbone of web content. It provides a standardized way to structure information on a webpage. Elements like <div>, <p>, and <h1> are essential building blocks, allowing developers to organize and present content logically. HTML5 introduces new semantic elements, such as <nav>, <article>, and <section>, enhancing the structure of web documents.

CSS (Cascading Style Sheets):

CSS is the stylistic language that brings visual appeal to web pages. Selectors target HTML elements, and properties like color, font-size, and margin define their appearance. CSS enables the separation of content and presentation, allowing for consistent styling across an entire website. Advanced CSS features like Flexbox and Grid provide powerful layout options.

JavaScript:

JavaScript is the scripting language that adds interactivity and dynamic behavior to websites. With the advent of ECMAScript 6 (ES6), JavaScript has become more powerful and expressive. Frameworks like React.js, Angular, and Vue.js simplify complex UI development, promoting the creation of interactive and responsive web applications.

2. Responsive Web Design:

Responsive web design ensures a seamless user experience across devices. Media queries in CSS allow developers to apply styles based on the characteristics of the user’s device, adapting the layout and content presentation. Techniques like fluid grids and flexible images enable websites to gracefully scale from desktops to tablets and smartphones.

3. Browser Developer Tools:

Integrated developer tools in browsers offer a robust environment for debugging and optimizing code. Developers can inspect and modify HTML and CSS in real-time, analyze network activity, and diagnose performance issues. Browser developer tools are indispensable for identifying and resolving issues during the development process.

4. Version Control Systems:

Git, a distributed version control system, enables collaborative development by tracking changes in source code. Developers use Git to create branches, merge code changes, and maintain a history of project alterations. Platforms like GitHub, GitLab, and Bitbucket provide centralized repositories for hosting Git projects, fostering collaboration among developers.

5. Build Tools and Package Managers:

npm, as a package manager for Node.js, simplifies the management of project dependencies. It allows developers to install and share packages, enhancing code modularity. Webpack, a module bundler, streamlines the integration of various assets, optimizing the performance of web applications through features like code splitting and hot module replacement.

6. Cross-Browser Compatibility:

Achieving consistent user experiences across different browsers is a common challenge in front-end development. Testing tools like BrowserStack simulate various browser environments, helping developers identify and address compatibility issues. Cross-browser testing ensures that websites function as intended for users, regardless of their chosen browser.

7. Web Performance Optimization:

Optimizing web performance is crucial for delivering a fast and efficient user experience. Techniques include code minification to reduce file sizes, lazy loading of assets to prioritize critical content, and image optimization to balance quality and load times. Google Lighthouse is a tool that assesses web page performance, providing insights and recommendations for improvement.

8. Accessibility (a11y):

Creating accessible websites is an ethical and legal imperative. Web Content Accessibility Guidelines (WCAG) offer a comprehensive set of guidelines to ensure websites are usable by individuals with disabilities. Implementing accessible design practices, such as providing alternative text for images and using semantic HTML, promotes inclusivity and broadens the reach of digital content.

9. Progressive Web Apps (PWAs):

Progressive Web Apps (PWAs) combine the best features of web and mobile applications. They provide offline functionality, push notifications, and fast load times. Service workers, a key component of PWAs, enable background processes, allowing users to access content even in the absence of a network connection.

10. Continuous Learning:

Front-end development is a dynamic field that evolves rapidly. Developers need to stay informed about new tools, frameworks, and best practices. Resources like MDN Web Docs offer comprehensive documentation, while platforms like freeCodeCamp provide hands-on learning experiences. Continuous learning ensures that developers remain at the forefront of industry advancements and deliver cutting-edge solutions.

The following set of Frontend Developer Questions are based on HTML.

1. What Is an Attribute in HTML?

2. What is Marquee in HTML?

3. What is Semantic HTML?

4. How do you Display a Table on an HTML Webpage?

5. What is SVG in HTML?

6. In HTML, how do you separate a section of text?

7. How do you Create Nested Web Pages in HTML?

1. What Is an Attribute in HTML?

In HTML (Hypertext Markup Language), an “attribute” provides additional information about an HTML element and is always included in the opening tag of the element. Attributes are used to modify or customize the behavior of an HTML element.

Attributes consist of a name and a value, separated by an equal sign (=) and enclosed in double or single quotes. The value should be assigned to the attribute to specify its effect on the element.

html

<element attribute=”value”>Content</element>

Let’s break it down:

element: This is the HTML element to which you are applying the attribute.

attribute: The specific characteristic or property you want to assign to the element.

value: The value associated with the attribute. It defines how the attribute affects the element.

For example, the href attribute in an <a> (anchor) element is used to specify the URL that the link points to:

html

<a href=”https://www.example.com">Visit Example.com</a>

In this case, href is the attribute, and “https://www.example.com" is its value.

Attributes can vary depending on the HTML element. Different elements support different attributes. Learning about common attributes associated with specific HTML elements is crucial for creating effective and well-structured web pages.

2. What is Marquee in HTML?

In HTML, the <marquee> element is used to create a scrolling text or image effect on a web page. It was commonly used in the early days of the web to draw attention to certain content, but its usage has become less popular due to concerns about accessibility and modern web design practices.

Here’s a simple explanation:

html

direction: Specifies the direction of the scrolling. It can be “left” (default), “right,” “up,” or “down.”

behavior: Defines the scrolling behavior. It can be “scroll” (default), “slide,” or “alternate” (alternating between scrolling and sliding).

scrollamount: Determines the speed of the scrolling. The higher the number, the faster the scrolling.

For example, to create a simple left-scrolling marquee, you would use.

html

<marquee direction=”left”>Scrolling Text</marquee>

Keep in mind that the <marquee> element is considered obsolete in HTML5, and it’s not recommended for use in modern web development. Instead, CSS and JavaScript are preferred for creating dynamic and animated effects, as they offer more control, better performance, and improved accessibility.

3. What is Semantic HTML?

Semantic HTML (HyperText Markup Language) refers to using HTML markup in a way that accurately represents the structure and meaning of the content on a webpage. In simpler terms, it involves choosing HTML elements that best describe the type of content they enclose.

Semantic Elements:

HTML has a set of elements that carry meaning about the structure of your document. For example, , , , , , etc. These elements provide information about the role of the enclosed content.

Meaningful Tags:

Instead of using generic tags like or for everything, semantic HTML encourages the use of specific tags that convey the purpose of the content they wrap. For instance, use for navigation links, for paragraphs, to for headings, etc.

Accessibility:

Semantic HTML improves accessibility by providing a clear document structure. This benefits users who rely on screen readers or other assistive technologies to navigate and understand the content.

Search Engine Optimization (SEO):

Search engines use the structure of your HTML to understand the content of your webpage. Semantic HTML can contribute to better SEO because search engines can more accurately interpret the meaning and importance of different parts of your content.

Readability and Maintenance:

Using semantic HTML makes your code more readable and understandable for other developers (including your future self). It also facilitates easier maintenance and updates because the code reflects the logical structure of the content.

Example of non-semantic HTML:

html

<div id=”nav”>Navigation</div>

</div>

<div id=”content”>Content</div>

<div id=”sidebar”>Sidebar</div>

</div>

<div id=”footer”>Footer</div>

Example of semantic HTML:

html

<nav>Navigation</nav>

</header>

<main>

<div id=”content”>Content</div>

</article>

<aside id=”sidebar”>Sidebar</aside>

</main>

<footer>Footer</footer>

In the semantic example, the structure and purpose of each section are clearly defined using semantic HTML elements, making it more meaningful and understandable.

4. How do you Display a Table on an HTML Webpage?

The displaying a table on an HTML webpage is a common task and can be done using the <table>, <tr>, <th>, and <td> elements.

Create a Table:

Use the element to define a table on your webpage.

html

<table>

<! — table rows and cells will go here →

</table>

Add Table Rows:

Use the element to define a table row. Each row will contain cells for your data.

html

<table>

<tr>

<! — table cells will go here →

</tr>

</table>

Add Table Header Cells (Optional):

Use the element to define header cells. These cells are typically used for column or row headers.

html

<table>

<tr>

<th>Header 1</th>

<th>Header 2</th>

<! — add more header cells if needed →

</tr>

<tr>

<! — data cells will go here →

</tr>

</table>

Add Table Data Cells:

Use the element to define data cells within your rows.

html

<table>

<tr>

<th>Header 1</th>

<th>Header 2</th>

</tr>

<tr>

<! — add more data cells if needed →

</tr>

</table>

Putting it all together, here’s a simple example:

html

<!DOCTYPE html>

<html>

<head>

<title>Simple Table Example</title>

</head>

<body>

<h2>Sample Table</h2>

<tr>

<th>Header 1</th>

<th>Header 2</th>

</tr>

<tr>

</tr>

<tr>

</tr>

</table>

</body>

</html>

In this example, a table with two columns and three rows is created. The first row contains header cells (<th>), and the subsequent rows contain data cells (<td>). The border=”1" attribute is used to add a border to the table for better visibility, but it’s not required. You can customize the structure and appearance of the table according to your needs.

5. What is SVG in HTML?

SVG stands for Scalable Vector Graphics. It is an XML-based vector image format that is used to define two-dimensional vector graphics for the web. SVG images can be created and edited with any text editor, and they can be scaled to different sizes without losing quality. In HTML, SVG is often used to embed vector graphics directly into a web page.

Here are some key points about SVG in HTML:

XML-Based Format: SVG is based on XML (eXtensible Markup Language), which means that SVG files are essentially text files that can be created and edited with a text editor.

Vector Graphics: SVG is well-suited for describing vector graphics, which are graphics that are defined by mathematical equations. This makes SVG images scalable without loss of quality, as they can be resized to any size.

Embedding in HTML: SVG images can be embedded directly into HTML documents using the <svg> element. This allows you to include graphics within your HTML code, and they can be manipulated using CSS and JavaScript.

html

</svg>

Interactive Elements: SVG supports interactive elements and can be scripted using JavaScript. This allows for dynamic and interactive graphics on web pages.

Graphics Editing Software: SVG files can be created using graphics editing software like Adobe Illustrator or Inkscape, and then the generated SVG code can be directly embedded into HTML.

Using SVG in HTML is beneficial for creating graphics that need to scale well across different screen sizes and resolutions. It is widely supported by modern web browsers.

6. In HTML, how do you separate a section of text?

In HTML, you can use various elements to separate and structure different sections of text. Here are a few commonly used elements for this purpose.

Paragraphs (<p>):

Use the <p> element to define paragraphs of text. Each <p> tag creates a new paragraph, and the content inside the tag is treated as a separate block.

html

<p>This is the first paragraph.</p>

<p>This is the second paragraph.</p>

Headings (<h1>, <h2>, <h3>, <h4>, <h5>, <h6>):

Headings are used to define headings for sections of content. They create a hierarchical structure with <h1> being the highest level and <h6> being the lowest.

html

<h1>Main Heading</h1>

<h2>Subheading 1</h2>

<h3>Sub-subheading 1.1</h3>

Divisions (<div>):

The <div> element is a generic container that can be used to group and separate content. It doesn’t add any specific styling or formatting by default, but it can be styled with CSS.

html

<div>

<p>This is a paragraph inside a div.</p>

</div>

Line Breaks (<br>):

The <br> element is used to insert a line break within text, effectively creating a new line without starting a new paragraph.

html

This is some text.<br>

This is on a new line.

Choose the element that best fits your content structure. Combining these elements allows you to create well-organized and semantically meaningful HTML documents.

7. How do you Create Nested Web Pages in HTML?

Creating nested web pages in HTML involves structuring your HTML documents in a hierarchical manner. This is typically done using HTML tags to represent different levels of content. Here’s a simple example of how you can create nested web pages.

html

<!DOCTYPE html>

<head>

<title>Nested Pages Example</title>

</head>

<body>

<! — Main Page Content →

</header>

<nav>

<ul>

<li><a href=”#”>About</a></li>

<li><a href=”#”>Contact</a></li>

</ul>

</nav>

<main>

<h2>Introduction</h2>

<p>This is the main content of the page.</p>

</section>

<! — Nested Page →

<h2>Subpage</h2>

<p>This is a nested page within the main page.</p>

</section>

<! — Another Nested Page →

<h2>Another Subpage</h2>

<p>This is another nested page within the main page.</p>

</section>

</main>

<! — Footer →

</footer>

</body>

</html>

In this example:

The main page contains a header, navigation bar, main content, and a footer.

The main content includes sections representing different parts of the page.

Two sections () within the main content are considered as nested pages. These sections can be thought of as subpages within the main page.

You can extend this structure further based on your needs. You might also use other tags like <article>, <aside>, <div>, etc., depending on the semantic meaning of the content. The key is to maintain a logical structure that reflects the hierarchy of your content.

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laomusicarts · 2 years ago

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Learning ECMAScript 6+ (ES6+)

I just finished the course “Learning ECMAScript 6+ (ES6+)” by Eve Porcello!

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Check it out:

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freyayuki · 6 years ago

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freeCodeCamp JavaScript Course Notes List

Currently, I’m going through freeCodeCamp’s new learning curriculum. I just finished the first part, which was the Responsive Web Design Certification course.

While going through said course, I took notes on the following:

CSS Grid

CSS Flexbox

I also made several responsive web design projects as part of the course.

The second part of the freeCodeCamp curriculum was the Javascript Algorithms And Data Structures Certification course. The following is a list of all the notes I took while going through said course:

1. Basic JavaScript Notes

Part 1

Part 2

Part 3

2. ES6 or ECMAScript 6 Notes

Part 1

Part 2

3. Regular Expressions or Regex Notes

Part 1

Part 2

4. Debugging Notes

5. Basic Data Structures Notes

Part 1

Part 2

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aditioffpage1 · 2 years ago

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Introduction to Different Types of JavaScript for Web Applications

Are you looking to learn more about the different types of JavaScript? As a web developer, understanding the various options available for JavaScript is vital for success in your profession. In this article, we will provide an introduction to the different types of JavaScript, including client-side, server side, frameworks, libraries, trans pilers, poly-fills, syntax parsers and code optimizers.

Client-side JavaScript (also known as frontend JavaScript) is used to create interactive webpages that are viewable on modern web browsers. It allows developers to add interactivity and dynamic content to their websites. Additionally, it can be used to manipulate HTML and CSS elements which provides users with an improved experience when they interact with these elements on a webpage.

Server-side JavaScript (also known as backend JavaScript) is used primarily for server-side applications such as creating databases or processing data. It can also be used to build websites and APIs that require data from the server or database. Unlike frontend JavaScript which runs on the user's browser, server-side JavaScript is executed on the server and then sent to the user's browser when required.

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Frameworks are prewritten code that provide developers with a structure for building applications quickly and efficiently. Popular frameworks include ReactJS and NodeJS which both have extensive libraries of prebuilt components that make development faster and easier. They also allow developers to build complex applications from smaller components instead of having to write code from scratch each time.

Libraries are collections of code written by others that can be incorporated into your own projects and applications. Popular library examples include jQuery and Dojo Toolkit which help developers with many aspects of coding.

Mastering Different Types of Java-script for Web Applications

Writing web applications in JavaScript has become immensely popular in recent years. With the everchanging and expanding world of technology, understanding the different types of JavaScript is essential for developers to successfully create and maintain web applications. To help you master different types of JavaScript for web applications, here’s a comprehensive guide on the various variations of JavaScript, frameworks, runtime environments, query languages, and debugging techniques you should be aware of.

JavaScript Variations

When it comes to JavaScript variations, there are 3 main types: frontend JavaScript, backend JavaScript, and ES6 features. Frontend JavaScript is used to create interactive elements on a website by writing code that alters the website’s user interface. Backend JavaScript is used to power the logic behind a website’s server-side components. Lastly, ES6 (ECMAScript 6) introduces new syntax elements and also includes some features that make it easier to write complicated code such as classes, constants, arrow functions etc.

Frameworks

When developing web applications with JavaScript, frameworks like React or Vue can simplify complex tasks when developing frontend interfaces or React Native for mobile apps. Angular provides many useful tools for structuring standard enterprise projects which makes it a popular framework choice for many teams. With tools like React Hooks and Context API making state management easier than ever before.

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Runtime Environment & Query Language

The Node.js runtime environment makes it possible to run JavaScript outside of the browser—meaning that you can use the same language across your entire project rather than mixing languages (such as PHP/Python). Additionally Graph QL is an opensource query language that allows different software systems to interact with one another without relying on traditional REST.

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psychicanchortimemachine · 4 years ago

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TOP 10 OF ANGULAR 10

Angular model 10, has been launched at the twenty fourth of June, 2020 but with the beta version this time. This can imply that we are nearing the final launch of the newest version of the google-developed, typescript primarily based framework. The Version 10.0.0 is a major release that spans the framework, Angular Material, and the CLI. It has only been four months since they launched model 9.0 of Angular. Let’s explore the new features of Angular 10…

Here’s a list of top ten features of the newly updated Angular 10

1. Language Service and Localization

The language-service-precise compiler permits more than one typecheck files by using the venture interface which creates ScriptInfos as necessary. Autocompletion is additionally appeared to have been removed from HTML entities, consisting of &, <, etc., on the way to safeguard the inhouse center functionality of Angular LS, which holds questionable value and a performance cost. One of the fine capabilities of Angular 10 is that the today's angular model supports for merging of more than one translation files which could best load one report in the previous variations. Now clients can specify a couple of documents in step with locale, and the translations from each of these documents may be merged together by a message ID. In practice, this means you want to position the files so as of most vital first, with fallback translations later.

2. Router

The CanLoad shield now can go again Urltree in angular model 10. A CanLoad protect returning Urltree cancels the modern-day navigation and allows to redirect. This suits current conduct to the available CanActivate guards which might be also reputedly added. This however doesn’t have an effect on the preloading. Also, any routes with a CanLoad guard won’t be preloaded, and the guards will now not be completed as part of preloading. 3.Service Workers and Bug Fixes In the previous versions of angular Vary headers might had been considered even as retrieving sources from the cache, however simply stopping the retrieval of cached belongings and fundamental to unpredictable conduct because of inconsistent/buggy implementations in various browsers. However, in angular model 10 Vary headers are omitted even as retrieving sources from the ServiceWorker caches, which can bring about sources being retrieved even when their headers are not similar. If your utility needs to distinguish its responses based totally on request headers, it is important to ensure that the Angular ServiceWorker is configured to keep away from caching the affected sources. With this Angular 10 model, there had been a number of malicious program fixes, this consists of the compiler keeping off undefined expressions in a holey array and the middle averting a migration error at the same time as a nonexistent image is imported. Another worm restore ensures right identification of modules affected by overrides in TestBed. 4. Warnings about CommonJS imports

Starting with version 10, we now warn you while your build pulls in this kind of bundles. If you’ve started seeing these warnings on your dependencies, allow your dependency realize that you’d decide on an ECMAScript module (ESM) package. Converting pre-Ivy code All the pre-Ivy dependencies from npm ought to be converted to Ivy dependencies, which is supposed to take place as a precursor to jogging ngtsc at the application. Further all the destiny compilation and linking operations must be made inside the course of transforming variations of the dependencies.

5.Optional Stricter Settings

Angular version 10 offers a more strict project setup in order to create a new workspace with ng new.ng new --strictOnce this flag is enabled, it initializes the new task with a pair of recent settings that improve maintainability, help in catching bugs well in advance in time, and allow the CLI to perform superior optimizations on your app. Enabling this flag configures the app as side-effect free to make certain extra superior tree-shaking

What the flag does?

Enables strict mode in TypeScript

Turns template type checking to Strict

Default bundle budgets have been reduced by ~75%

Configures linting rules to prevent declarations of type any

Configures your app as side-effect free to enable more advanced tree-shaking

6. New browser configuration

The browser configuration is up to date for new initiatives to exclude older and less used browsers. This has the side effect of disabling ES5 builds by means of default for brand new projects. To permit ES5 builds and differential loading for browsers that require it (which include IE or UC Browser), actually upload the browsers you want to guide within the .browserslistrc file. 7. Typescript 3.9, TSLib 2.9 & TSLint v6

Angular 10 features typescript 3.9. As opposed to the previous version which supported typescript 3.6, 3.7 and even 3.8. Typescript is a language that builds on JavaScript by adding syntax for type declarations and annotations which is used by the TypeScript compiler to type-check our code. This in turn clean readable JavaScript that runs on lots of different runtimes. Typescript helps save the files with its rich editing functionality across editors. With Typescript 3.9 the team has worked on performance, polish, and stability. Apart from error-checking, this version powers things like completions, quick fixes and speeding up the compiler and editing experience.

8.Deprecations

The Angular Package Format no longer includes ESM5 or FESM5 bundles, saving you 119MB of download and install time for Angular packages and libraries. These formats are are not needed as any downleveling to help ES5 is finished at the end of the construct process. Deprecating support for older browsers including IE 9, 10, and Internet Explorer Mobile.

9. Flags and logic

Logic is updated relating formatting day periods that cross midnight, which will fit the time within an afternoon period that extends past midnight. Applications which are the use of either formatDate() or DatePipe or the b and B format codes are likely to be affected by this change. Another point underneath this segment is that any resolver that returns EMPTY will occur to cancel navigation. In order to enable any navigation, builders will should replace the resolvers to update some vale, together with default!Empty. Angular NPM inside the version 10 does no longer contain wonderful jsdoc comments to assist the Closure Compiler’s superior optimizations. Support for Closure Compiler in applications has been experimental and damaged for some times. For folks who will employ Closure Compiler is possibly better off soaking up Angular programs constructed from resources directly in preference to ingesting variations published on NPM. As a brief workaround, customers can't overlook using their present-day construct pipeline with Closure flag --compilation_level=SIMPLE. This flag will make sure that the build pipeline produces buildable, runnable artifacts, at a price of elevated payload size because of advanced optimizations being disabled.

10.New Date Range Picker

Material now consists of a brand new date range picker. To use the new date range picker, you can use the mat-date-range-input and mat-date-range-picker components.

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secretcupcakesublime · 4 years ago

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TOP 10 OF ANGULAR 10

Here’s a list of top ten features of the newly updated Angular 10

1. Language Service and Localization

2. Router

5.Optional Stricter Settings

What the flag does?

Enables strict mode in TypeScript

Turns template type checking to Strict

Default bundle budgets have been reduced by ~75%

Configures linting rules to prevent declarations of type any

Configures your app as side-effect free to enable more advanced tree-shaking

6. New browser configuration

8.Deprecations

9. Flags and logic

10.New Date Range Picker

Material now consists of a brand new date range picker. To use the new date range picker, you can use the mat-date-range-input and mat-date-range-picker components.

get in touch with us!

#b2b website #ecommerce

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freyayuki · 6 years ago

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freeCodeCamp Basic Data Structures Course Notes Part 2

Now that there’s a new freeCodeCamp learning curriculum, I resolved to go through each of the lessons and finish all of them.

I was able to finish all the Responsive Web Design courses including all the projects. Check out this post for more info about these projects.

Check out the following articles for the notes I took while going through the course:

Flexbox Notes

CSS Grid Notes

Now that I’m done with the Responsive Web Design Certification course, the next course is the Javascript Algorithms And Data Structures Certification course.

The first part of that course is Basic JavaScript. Check out the notes I took while going through that course:

Part 1

Part 2

Part 3

The second part of the JavaScript course is the ES6 or ECMAScript 6 course. Check out the notes I took while going through that course:

Part 1

Part 2

The third part of the JavaScript course is the Regular Expressions or Regex course. Check out the notes I took while going through that course:

Part 1

Part 2

The fourth part of the JavaScript course is Debugging. You can find the notes I took while going through this course here.

The fifth part of the JavaScript course is Basic Data Structures. This is part 2 of the notes I took while going through this course. You can find part 1 here.

You can find the Basic Data Structures course here: https://learn.freecodecamp.org/javascript-algorithms-and-data-structures/basic-data-structures

Iterate Through All an Array's Items Using For Loops

Sometimes when working with arrays, it is very handy to be able to iterate through each item to find one or more elements that we might need, or to manipulate an array based on which data items meet a certain set of criteria. JavaScript offers several built in methods that each iterate over arrays in slightly different ways to achieve different results (such as every(), forEach(), map(), etc.), however the technique which is most flexible and offers us the greatest amount of control is a simple for loop.

We have defined a function, filteredArray, which takes arr, a nested array, and elem as arguments, and returns a new array. elem represents an element that may or may not be present on one or more of the arrays nested within arr. Modify the function, using a for loop, to return a filtered version of the passed array such that any array nested within arr containing elem has been removed.

Create complex multi-dimensional arrays

One of the most powerful features when thinking of arrays as data structures, is that arrays can contain, or even be completely made up of other arrays.

arrays can contain an infinite depth of arrays that can contain other arrays, each with their own arbitrary levels of depth, and so on. In this way, an array can very quickly become very complex data structure, known as a multi-dimensional, or nested array. Consider the following example:

We have defined a variable, myNestedArray, set equal to an array. Modify myNestedArray, using any combination of strings, numbers, and booleans for data elements, so that it has exactly five levels of depth (remember, the outer-most array is level 1). Somewhere on the third level, include the string 'deep', on the fourth level, include the string 'deeper', and on the fifth level, include the string 'deepest'.

let myNestedArray = [ ['unshift', false, 1, 2, 3, 'complex', 'nested'], ['loop', 'shift', 6, 7, 1000, 'method'], ['concat', false, true, 'spread', 'array', ['deep']], ['mutate', 1327.98, 'splice', 'slice', 'push', [['deeper']]], ['iterate', 1.3849, 7, '8.4876', 'arbitrary', 'depth', [[['deepest']]]] ];

let nestedArray = [ // top, or first level - the outer most array "first", "Sirius", "Regulus", ['second', "Harry", "Ron"], // an array within an array, 2 levels of depth [ ['third'], ['Arthur', "Molly"] // arrays nested 3 levels deep ], [ [ ['fourth'], ['Lucius'], ["Narcissa"] // arrays nested 4 levels deep ], [ [ ['fifth'], ["Fred"], ["George"] // an array nested 5 levels deep ] ] ] ]; //first console.log(nestedArray[1]); //returns Sirius //second console.log(nestedArray[3][2]); //returns Ron //first bracket - 0 is first, 1 is sirius, 2 is regulus, 3 is second //second bracket - 0 is second, 1 is harry, 2 is ron //third console.log(nestedArray[4][1][1]); //returns Molly //fourth console.log(nestedArray[5][0][1]); //returns Lucius //fifth console.log(nestedArray[5][1][0][2]); //returns George

var deepArray = [//0 or first "Bellatrix", [//second or 1 "Andromeda", [//third or 2 "Narcissa", [//fourth or 3 "Sirius", [//fifth or 4 "Regulus" ] ] ] ] ]; console.log(deepArray[0]); //returns Bellatrix console.log(deepArray[1][0]); //returns Andromeda console.log(deepArray[1][1][0]); //returns Narcissa console.log(deepArray[1][1][1][0]); //returns Sirius console.log(deepArray[1][1][1][1][0]); //returns Regulus

Add Key-Value Pairs to JavaScript Objects

At their most basic, objects are just collections of key-value pairs, or in other words, pieces of data mapped to unique identifiers that we call properties or keys.

Notice that with bracket notation, we enclosed followers in quotes. This is because the brackets actually allow us to pass a variable in to be evaluated as a property name. Had we passed followers in without the quotes, the JavaScript engine would have attempted to evaluate it as a variable, and a ReferenceError: followers is not defined would have been thrown.

Using the same syntax, we can also add new key-value pairs to objects. We've created a foods object with three entries. Add three more entries: bananas with a value of 13, grapes with a value of 35, and strawberries with a value of 27.

let foods = { apples: 25, oranges: 32, plums: 28 }; foods.bananas = 13; foods["grapes"] = 35; foods.strawberries = 27; console.log(foods);

var fleur = { firstName: "Fleur", lastName: "Delacour", sister: "Gabrielle", husband: "Bill" }; var fleurSister = fleur.sister; console.log(fleurSister); //returns Gabrielle var fleurHusband = fleur["husband"]; console.log(fleurHusband); //returns Bill //add new key-value pairs to the fleur object fleur.bloodStatus = "Quarter-Veela"; fleur["school"] = "Beauxbatons"; console.log(fleur); //returns the fleur object with the new key-value pairs

Modify an Object Nested Within an Object

Object properties can be nested to an arbitrary depth, and their values can be any type of data supported by JavaScript, including arrays and even other objects. Consider the following:

//Set the value of the online key to 45 let userActivity = { id: 23894201352, date: 'January 1, 2017', data: { totalUsers: 51, online: 42 } }; userActivity.data.online = 45; console.log(userActivity);

Access Property Names with Bracket Notation

can use bracket notation as a way to access property values using the evaluation of a variable.

imagine that our foods object is being used in a program for a supermarket cash register. We have some function that sets the selectedFood and we want to check our foods object for the presence of that food. This might look like:

We’ve defined a function, checkInventory, which receives a scanned item as an argument. Return the current value of the scannedItem key in the foods object. You can assume that only valid keys will be provided as an argument to checkInventory.

let foods = { apples: 25, oranges: 32, plums: 28, bananas: 13, grapes: 35, strawberries: 27 }; function checkInventory(scannedItem) { return foods[scannedItem]; } console.log(checkInventory("apples")); //returns 25 console.log(checkInventory("bananas")); //returns 13 console.log(checkInventory("strawberries")); //returns 27

var shoppingList = { robes: 3, hat: 1, gloves: 1, cloak: 1, books: 8, wand: 1, cauldron: 1, phials: 1, telescope: 1, scales: 1, pets: 1 }; var checkList = (item) => shoppingList[item]; console.log(checkList("robes")); //returns 3 console.log(checkList("books")); //returns 8 console.log(checkList("wand")); //returns 1

Use the delete Keyword to Remove Object Properties

Objects are key-value stores which provide a flexible, intuitive way to structure data, and, they provide very fast lookup time.

How to “remove a key-value pair from an object”? Use the delete keyword.

delete foods.apples; //will remove the apples key

Use the delete keyword to remove the oranges, plums, and strawberries keys from the foods object.

let foods = { apples: 25, oranges: 32, plums: 28, bananas: 13, grapes: 35, strawberries: 27 }; delete foods.oranges; delete foods.plums; delete foods.strawberries; console.log(foods);

var deathEaters = { 1: "Bellatrix", 2: "Alecto", 3: "Amycus", 4: "Nymphadora", 5: "Sirius", 6: "Peter", 7: "Lucius", 8: "Severus", 9: "Andromeda", 10: "Minerva" }; delete deathEaters["4"]; delete deathEaters["5"]; delete deathEaters["9"]; delete deathEaters["10"]; console.log(deathEaters); //returns

Check if an Object has a Property

we can add, modify, and remove keys from objects. But what if we just wanted to know if an object has a specific property? JavaScript provides us with two different ways to do this. One uses the hasOwnProperty()method and the other uses the in keyword. If we have an object users with a property of Alan, we could check for its presence in either of the following ways:

users.hasOwnProperty('Alan'); 'Alan' in users; // both return true

We've created an object, users, with some users in it and a function isEveryoneHere, which we pass the users object to as an argument. Finish writing this function so that it returns true only if the users object contains all four names, Alan, Jeff, Sarah, and Ryan, as keys, and false otherwise.

Iterate Through the Keys of an Object with a for...in Statement

We've defined a function, countOnline; use a for...in statement within this function to loop through the users in the users object and return the number of users whose online property is set to true.

Generate an Array of All Object Keys with Object.keys()

We can also generate an array which contains all the keys stored in an object using the Object.keys()method and passing in an object as the argument. This will return an array with strings representing each property in the object. There will be no specific order to the entries in the array.

Finish writing the getArrayOfUsers function so that it returns an array containing all the properties in the object it receives as an argument.

var snape = { name: "Severus Snape", house: "Slytherin", bestFriend: "Lily Evans", occupation: { job: "Teacher", title: "Potions Master", head: "Head of Slytherin House", school: "Hogwarts" }, bloodStatus: "Half-Blood" }; var snapeKeys = (obj) => Object.keys(obj); console.log(snapeKeys(snape)); //returns name,house,bestFriend,occupation,bloodStatus (5) ["name", "house", "bestFriend", "occupation", "bloodStatus"]

Modify an Array Stored in an Object

The user object contains three keys. The data key contains five keys, one of which contains an array of friends. From this, you can see how flexible objects are as data structures. We've started writing a function addFriend. Finish writing it so that it takes a user object and adds the name of the friend argument to the array stored in user.data.friends and returns that array.

#freecodecamp #javascript #learn programming #how to code #learning resources #coding #programming #learn to code #js #resources #javascript basic data structures #learn how to code #my notes #learn js #learn javascript #basic data structures #learn basic data structures

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freeudemycourses · 4 years ago

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[100% OFF] Angular 11 - La Guia Completa + 15 Proyectos

[100% OFF] Angular 11 – La Guia Completa + 15 Proyectos

What you Will learn ? Crear 15 aplicaciones utilizando Angular Dominar databinding, directivas, componentes, routeo, servicios, formularios y la estrucutra de un proyecto de Agular Construir código limpio y elegante como un profesional Aplicar conceptos de ECMAScript 6 Consumir API��s desde Angular Configurar Angular Material en nuestro proyecto Course Description Este curso desarrollaras 15…

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udemycouponfree9 · 5 years ago

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Modern Javascript for Beginners 2020 + Javascript Projects

n this course, we hope to interrupt down the newbie ideas of the Javascript programming language into manageable elements so you possibly can study them quick and retain the ideas for much longer. This course will likely be helpful for each inexperienced persons to the world of programming and programmers who already know different programming languages. We'll be educating you the newest model of Javascript (ECMAScript 2015 and above). Every idea is taught by way of a wealth of over-the-shoulder examples so that you perceive the ideas higher. What will you study in our course? 1. A thorough introduction to the Javascript programming language 2. Information storage utilizing variables and constants (each ES5 & ES6 strategies) 3. Using the console to debug your code, verify errors and retrieve intermediate outputs 4. Creating dynamic storages utilizing variables and Javascript's completely different datatypes, together with complicated and easy ones 5. Javascript's strict mode and the way it regulates your code 6. Type conversions in Javascript (together with NaN, undefined and null) 7. Various methods to present outputs and get inputs from the customers 8. Applying the numerous operators out there in Javascript in your strings, numbers and boolean values 9. What are template strings (backticks) and when & methods to use them 10. Working with strings and making use of the varied pre-defined string strategies out there to you on them 11. Read the full article

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ryadel · 5 years ago

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How to become a Web Developer: a detailed plan for learning JavaScript

Everyone who wants to become an IT developer usually begins with making sites, as the easiest part of it. To work, you need only a text editor for writing the code and browser to see visually what you are doing. If you're not aiming to a full-stack approach and you just want learn the magic of client-side programming, you won't have to study complicated algorithms: as a matter of fact, the main skill each client-side web developer must have nowadays is the knowledge of JavaScript (and its frameworks). The best way to learn is by creating own website using multiple technologies. For example, you can create website and display stats from popular games like Counter-Strike and Valorant. Such a project requires HTML, CSS, Git, Bootstrap, JavaScript, Bash, MySQL. A nice example is the Valorant Tracker project, which is something that could be done in 4-6 months if you're willing to learning JavaScript programming. Once you manage to pull off something like that, you'll have a good chance to get hired as a junior code in a decent company and start your developer career. Nowadays, JS has been developing incredibly fast, so it's easy to get confused while studying this language. We offer you an educational plan with a convenient structure, where you will find all the main aspects of JavaScript and other adjacent technologies.

Why JavaScript?

We have to mention that language being pretty open - many companies are rivaling using JS with the goal of its evolution. The language is incredibly flexible, so it is perfect for people who like both object-oriented and functional approaches. A mammoth amount of different libraries and frameworks allows you to solve even the most difficult issues. Moreover, the server platform Node.js allows you to use JS not just in browsers but on the console. You can create apps for both smartphones and PC. Apps for a computer by using the Electron framework, and mobile apps thanks to NativeScript or ReactNative.

Git

The first thing you should do is to study how Git works: a source code manager is a vital instrument for developers, so you have to learn it first - since it's arguably the best choice nowadays. Here are three common topics you might start to learn to quickly understand the basics: Creation and moving of the files across catalogs. Initialization and commits in Git. Repositories settings in GitHub. Also, you must have the next skills: Object-oriented JS - constructors and factories. Functional JS - functions of the highest order, circuit, and recursion. Specification of the Jasmine tests. Basics of the HTML, CSS, and jQuery. To better understand these topics, be sure to check out our posts, guides and tutorials regarding Git and GitHub.

Algorithms and data structures

Later you have to learn algorithms (especially big complicated ones), and basic data structures: connected lists, turns, stacks, binary searching trees, and hash-tables.

Back-end JavaScript frameworks

Node.js - Approximately a decade ago JS was used only for writing the code for front-end (just like CSS and HTML), but today due to Node.js the situation is quite the opposite. Node - is a server area for committing all the actions by JS, so you won't have to learn all the new syntax. Although, you will have to import and export files, divide the entire code for modules, and use the pack-manager NPM. Express.js - Besides learning Node you have to get more knowledge about back-end development, especially about servers and routing. Ports and protocols with HTTP will be a nice start before studying Express. Express.js - Node-library for requests` processing.

Asynchronous JavaScript (AJAX)

If you don’t want to refresh your page after each change in your DB, Ajax is certainly what you will need - it sends asynchronous HTTP-request to reload only part of the page. You can work with Ajax through the jQuery (see below) or by directly (manually) handling the XMLHttpRequest object. Asynchrony is the thing that makes JS unique but separating developers into two sides: some love it and some hate. Each developer has to know both advantages and disadvantages of that technology. You can start by studying call stacks, events cycles, and callbacks, then - studying promises.

Databases, Schemes, Models, and ORM

Databases one of the most important parts of web development. If your app has to save or load some information without losing it just after the page's update, you definitely will have to use DB. You have to learn how to see the difference between relational and non-relational DB and learn their connection ways. The next step will be studying the SQL and different systems for controlling DB. Knowledge of ORM won't be excessive.

HTML and CSS

Those languages are the very basics of the web-design. You don't have to know them perfectly but understand their code. Then you will have to learn at least one popular library (for example, Bootstrap). For CSS you have to learn processors, like Sass that will make CSS more similar to the normal code. For making work with the HTML you can pick any template, like PUG. To better understand these topics, be sure to check out our posts, guides and tutorials regarding HTML, HTML5, CSS and CSS3.

jQuery and DOM manipulations

After you finished the main look of the page using HTML and CSS, you will use event translators and jQuery for the DOM controlling. Many people think that jQuery is useless and soon will be replaced by Angular or React. Maybe it's true, but jQuery is worldwide popular, so in any case, you must know it. Moreover, you can get into the situation when you will have to do an incredibly complicated job using React-microscope, so in that situation, light jQuery will be your salvation. To better understand these topics, be sure to check out our posts, guides and tutorials regarding JQuery.

Chrome instruments for developers

If we didn't mention the Chrome instrument which makes the programming job easier, we wouldn't forgive ourselves. Thanks to them you will be able to learn DOM, debugging process through the console, routes` tracking and so much more.

Test-Diven Development

Also called TDD: this is the development tactic when the software divides for a few tiny cycles: Writing down the code to make all changes you had to. Writing down the code that will pass all tests. Refactoring the code and writing new tests if those are necessary. If some parts of the code don't pass the test, they have to be rewritten. If you work with JS we firmly recommend you pay attention to the Jasmine, Chai, and Mocha frameworks. To better understand these topics, be sure to check out the ASP.NET Core 3 and Angular 9 book, which features an entire chapter about client-side TDD using the Karma test runner and Jasmine testing suite.

Web Sockets

We have to pay extra attention to that topic because web-sockets are useful. WebSocket protocol, unlike the HTTP one, will allow you to work with a bidirectional data stream – the reason why is that tech unique. The most popular library called socket.io and is well documented here.

EcmaScript 6 (ES2015)

Nowadays, the main standard is ES6 (ES2015), ES2016 has been confirmed already and the ES2017 is under development right now, so you always have to watch their updates and use the newest and most stable version. All compatibility problems can be solved easily with the next apps.

Babel

Babel - compiles ES6 (ES2016 support is expected soon) into the ES5, which is well-known by all browsers. It also can compile JSX/REACT-components, which makes it vital for web-developers. Webpack - takes all your files (images, fonts, style tables, JS-files, etc) into the single dependency graph. You don't have to use it if you are making a small app but shall use it while working with React.

React and Redux

React (also known as ReactJS) - the library which will allow you to create a user's interface. It was created by Facebook in 2013 and became worldwide popular pretty fast. React is needed not just for web-design, but there are versions for smartphones (React Native) and VR (React VR), published later by the same company. Redux - container of predictable states, usually used with React. It can be used for shortening the code by the modeling way. Pretty useful in real-time working apps with a big number of users, such as games. To better understand these topics, be sure to check out the series of React & ReactJS articles we've published in the last few years.

Authentication, Sessions, Cookies

You have to understand how the app will interact with users - how users will log in\out of their accounts, get bonuses, etc. For identifying people during surfing your site, web-sites using cookies - small text-files that send a reply from server to browser for user's HTTP request. For the connection between DB and log-in page, you can use the express-session library.

Web Security

Each site/app, of course, must be secure and reliable. You have to get the knowledge of all possible attacks on your creation and ways of protection as well. To better understand these topics, be sure to check out the various IT & Development Security articles we published in the last few years.

Conclusions

In this post we tried to write a list of the main study topics that await a novice JavaScript developer. Most of these tools will become your best friends, others will make you spit blood: each of them, however, will help you better understand how to overcome the inevitable difficulties that await your learning path and satisfy the development requests of the clients. Read the full article

#Ajax #Babel #Counter-Strike #CSS #Electron #ES2015 #Express.js #Git #GitHub #HTML #Jasmine #Javascript #Karma #Node.js #React #Redux #Valorant

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thinktanker · 5 years ago

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Angular JS vs React JS: Which One to Choose?

Angular and React, both of these are most in-demand frameworks. It is the biggest question for any business owner to choose the right JavaScript system, application or website. It can have an immediate bearing on task’s toughness and capacity to fit in cutoff times, further code practicality, and versatility of your future application.

The essential contrast among AngularJS and ReactJS lies in the condition of its administration. AngularJS has information restricting packaged in as a matter of course, though React is commonly enlarged by Redux to give unidirectional information stream and work with changeless information. Both are restricting methodologies and there is no agreement on what is better: variable/bi-directional information authoritative or unchanging/unidirectional. Let us have a look at benefits of React as well as AngularJs

Implementation

AngularJS is a system that gives countless local alternatives and highlights. It permits you to profit by various alternatives legitimately, which makes it conceivable to begin a task quicker without being threatened by the decisions to be made at startup.

When looking at ReactJS Vs AngularJS, it is essential to realize that ReactJS is an open-source JavasScript library. Thus, you have to add outside segment libraries to have a similar number of highlights. You should include components for “directing” to compel unidirectional streams, to call APIs, set up tests, oversee conditions, and that’s only the tip of the iceberg.

Data Binding

AngularJS makes use of a two-way data binding that connects Document Object Model(DOM) values to model data. Meaning, if for the purpose of user interaction with a field, a new value is provided to the app, it will surely result in the update of both the view and the model. Additionally, it also lets you write less boilerplate code in order to include the interactions between the components in your application. These two-way data binding approaches have a negative impact on the performance.

When talking about React JS, it supports one way binding. It offers singular behavior for your application. The risk of errors are decreased React JS and also helps to maintain complex nature by one way data flow while also maintaining ease to debug large react applications

Architecture

Based on MVVM model i.e., model-view-view-model comes with features such as data link, change detection, forms, routing, navigation, HTTP implementation are just listed of many.

React JS is based on MVC model which is model view controller that only works with view layer with libraries like Redux and Flux as controller or react-router for navigation

Performance

AngularJS offers a boost in loading speed by its MVVM model which loads pages considerably faster and advances to asynchronous mod which reduces entry in a server increasing speed of designing web pages.

In ReactJS an own virtual DOM is created where its components are framed. Also brings ease in navigation because data is displayed without refreshing the page.

AngularJS offers low execution with complex and dynamic applications. Likewise, virtual DOM empowers the quicker exhibition of ReactJS applications than AngularJS applications for the uses of a similar size.

Dependency Injection

It is a product configuration design that helps in making parts reusable, viable, and testable. AngularJS consequently finds the proper infused objects with parameters, for example, $routeParams, $filter, store, and $scope. $inject and $provide are the two capacities that make dependency injection conceivable in the AngularJS system. In any case, the inherent holder for dependency injection with React is missing. It is made conceivable by the consideration of instrument modules, for example, Browserify, RequireJS, ECMAScript 6 modules. It is one of the huge purposes of correlation among AngularJS and ReactJS.

Directives And Templates

AngularJS has its directives to chip away at DOM. ng-tie or ng-application are a portion of the standard directives with it. Further, you can even make your orders also. It is considered as one of the most remarkable approaches to work with the DOM. Likewise, to outline, we can utilize orders, both standard and explicit to tie DOM components with AngularJS applications.

In React, whenever an event occurs it chooses to reinterpret all templates and UI but does not differ any division in templates or template logic and directives.

Conclusion

AngularJS and ReactJS both have a great community for support offers wide documentation but with different perspectives when it comes to how app development is done.

Therefore you may choose React js and hire a finest Reactjs development company when you want to expand functions of your application or when you have dynamic content that changes constantly.

You shall choose AngularJs when you need to quickly start and establish a framework seeking a powerful fast and a maintained project of any size.

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tak4hir0 · 5 years ago

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1. Don’t use public accessor within classesDon’t: Do: Why? All members within class are public by default (and always public in runtime, TS private/protected will "hide" particular class properties/methods only during compile time). Don't introduce extra churn to your codebase. Also using publicaccessor is not "valid/idiomatic javascript" 2. Don’t use private accessor within Component classDon’t: Good: Better: Why: private accessor won't make your properties/methods on class private during runtime. It's just TypeScript "emulation during compile time". Don't get fooled and make things "private" by using well known patterns like: In reality, you should almost never need to work directly with React Component instance nor accessing its class properties. 3. Don’t use protected accessor within Component classDon’t: Do: Why: Using protected is an immediate "RED ALERT" 🚨🚨🚨 in terms of functional patterns leverage with React. There are more effective patterns like this for extending behaviour of some component. You can use: just extract the logic to separate component and use it as seen aboveHoC (high order function) and functional composition.CaaF ( children as a function )4. Don’t use enumDon’t: Good: If you need to support runtime enums use following pattern: Better: If you don’t need to support runtime enums, all you need to use are type literals: Why?: To use enum within TypeScript might be very tempting, especially if you're coming from language like C# or Java. But there are better ways how to interpret both with well known JS idiomatic patterns or as can be seen in "Better" example just by using compile time type literals. Enums compiled output generates unnecessary boilerplate (which can be mitigated with const enum though. Also string enums are better in this one)Non string Enums don’t narrow to proper number type literal, which can introduce unhandled bug within your appIt’s not standard/idiomatic JavaScript (although enum is reserved word in ECMA standard)Cannot be used with babel for transpiling 👀🙇‍Enum helperIn our “Good” example, you might think like, ugh that’s a lot of boilerplate dude! I hear you my friends. Loud and clear 🙏 If you need to support runtime enums for various reasons, you can leverage small utility function from rex-tils library like showcased here: 5. Don’t use constructor for class ComponentsDon’t: Do: Why: There is really no need to use constructor within React Component. If you do so, you need to provide more code boilerplate and also need to call super with provided props ( if you forget to pass props to your super, your component will contain bugs as props will not be propagated correctly). But… but… hey ! React official docs use constructor! 👉 That’s fine (React team uses current version of JS to showcase stuff) But… but…, class properties are not standard JavaScript! 👉 Class fields are in Stage 3, which means they are gonna be implemented in JS soon Initializing state with some logicOf course you may ask, what if I need to introduce some logic to initialize component state, or even to initialize the state from some dependant values, like props for example. Answer to your question is rather straightforward. Just define a pure function outside the component with your custom logic (as a “side effect” you’ll get easily tested code as well 👌). 6. Don’t use decorators for class ComponentsDon’t: Good: Better: Why: Decorators are parasitic 🐛 👀 🤢 You won’t be able to get original/clean version of your class.TypeScript uses old version of decorator proposal which isn’t gonna be implemented in ECMAscript standard 🚨.It adds additional runtime code and processing time execution to your app.What is most important though, in terms of type checking within JSX, is, that decorators don’t extend class type definition. That means (in our example), that our Container component, will have absolutely no type information for consumer about added/removed props.7. Use lookup types for accessing component State/Props types🙇‍ lookup types Don’t: Do: Why: Exporting Props or State from your component implementation is making your API surface bigger.You should always ask a question, why consumers of your component should be able to import explicit State/Props type? If they really need that, they can always access it via type lookup functionality. So cleaner API but type information is still there for everyone. Win Win 💪If you need to provide a complex Props type though, it should be extracted to models/types file exported as Public API.8. Always provide explicit type for children PropsDon’t: Do: Why: children prop is annotated as optional within both Component and Functional Component in react.d.ts which just mirrors the implementation how React handles children. While that's ok and everything, I prefer to be explicit with component API.if you plan to use children for content projection, make sure to explicit annotate it with type of your choosing and in opposite, if your component doesn't use it, prevent it's usage with never type.Children type constraint 🚸Hey, mister Skateboarder ! I have a question ✋: What types can be used for children annotation in TypeScript ? I mean, can I constraint children to be only a particular type of Component (like is possible with Flow) ? Something like Tab within Tabs children: Tab[] ? Unfortunately not 🙃, as TypeScript isn’t able to “parse” output of JSX.factory 👉 React.createElement which returns JSX.Element from global namespace, which so what compiler gets is an object type, with type checking turned off (WARNING:every time you any a kitten dies 🙀😅) Or as stated in TypeScript docs 👀: “By default the result of a JSX expression is typed as any. You can customize the type by specifying the JSX.Element interface. However, it is not possible to retrieve type information about the element, attributes or children of the JSX from this interface. It is a black box ⬛️ 📦." NOTE: TS 2.8 introduced locally scoped JSX namespaces, which may help to resolve this feature in the future. Watch this space! We can use following types for annotating children: ReactNode | ReactChild | ReactElementobject | {[key:string]:unknown} | MyModelprimitives string | number | boolean where T can be any of formernever | null | undefined ( null and undefined doesn't make much sense though )9. Use type inference for defining Component State or DefaultPropsDon’t: Good: Better: By making freezing initialState/defaultProps, type system will infer correct readonly types (when someone would accidentally set some value, he would get compile error). Also marking both static defaultProps and state as readonly within the class, is a nice touch, to prevent us from making any runtime errors when incorrectly setting state via this.state = {...} Why: Type information is always synced with implementation as source of truth is only one thing 👉 THE IMPLEMENTATION! 💙Less type boilerplateMore readable codeby adding readonly modifier and freezing the object, any mutation within your component will immediately end with compile error, which will prevent any runtime error = happy consumers of your app!What if I wanna use more complicated type within state or default props?Use as operator to cast your properties within the constant. Example: How to infer state type if I wanna use derived state from props?Easy 😎… We will use pattern introduced in tip no. 5 with power of conditional types (in particular, standard lib.d.ts ReturnTypemapped type, which infers return type of any function ✌️)

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t-baba · 6 years ago

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V8 Lite, accurate timing in JavaScript, and generating a million digits of Pi

#454 — September 13, 2019

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JavaScript Weekly

V8's Work on a Lighter V8 — V8 Lite has been a project aimed at reducing V8’s memory usage. Initially it was going to be a separate mode of V8 but many improvements have been able to come over to regular V8 too. Here’s a look at some of the key optimizations and the actual benefits to real workloads.

Mythri Alle, Dan Elphick, and Ross McIlroy (V8)

Moving Your JavaScript Development to the Terminal on Windows — If you’ve recently taken a look at Windows after becoming comfortable with macOS or Linux, this is for you. It’s a very detailed look at creating a powerful and elegant terminal-based development experience on Windows 10 using WSL and more.

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All-In-One Visual Testing and Review Platform — Replace time-consuming manual QA to catch visual UI bugs automatically. With Percy, you can test your UI across browsers and responsive widths on every pull request for continuous visual coverage.

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Metronomes in JavaScript — An interesting experiment in comparing the efficacy of async functions, Web Workers, and using the Web Audio API’s clock for scheduling things precisely.

Monica Dinculescu

Lists of New ECMAScript Features by Version — This is pretty neat. Short and sweet lists of new ES features (with basic examples) that were introduced in ES2015 (a.k.a. ES6), ES2016, ES2017 and so on.

Dietmar Aumann

Immer 4.0: A Way to Work with Immutable State in JS — A popular package for working with immutable state in a convenient way. You apply changes to a draft state object and the mutations are applied to a state resulting in a new one.

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💻 Jobs

Full Stack Engineer — Expensify seeks a self-driven individual passionate about making code effective, with an understanding of algorithms and design patterns.

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Find a JavaScript job through Vettery — Make a free profile, name your salary, and connect with hiring managers from top employers.

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📘 Articles & Tutorials

Let's Generate a Million Digits of Pi in 9 Lines of JavaScript — BigInt support makes this possible.

Andrew Jennings

A Re-Introduction to Destructuring Assignment — Destructuring assignment, introduced in ES6, provides an interesting way to dig into arrays and other objects to withdraw values more directly.

Laurie Barth

A Much Faster Way to Debug Code Than with Breakpoints or console.log — Wallaby catches errors in your tests and code and displays them right in your editor as you type, making your development feedback loop more productive.

Wallaby.js sponsor

Using void in JavaScript and TypeScript — void means rather different things in JS and TypeScript and does some things I hadn’t expected too.

Stefan Baumgartner

The 5 Big Features of TypeScript 3.7 and How to Use Them — It’s due in early November.

Tim Perry

▶ A 6 Hour React Native 'Crash Course' for Beginners — It’s slow going at first, but that’s because it’s truly aimed at beginners. It’s amazing how much is included here, though, and it’s well recorded too.

Maximilian Schwarzmüller

It’s Not Wrong That "🤦🏼‍♂️".length == 7 — The underlying ‘length’ of an emoji character is a complicated thing.. not just in JavaScript but in other languages too.

Henri Sivonen

X3D: Declarative 3D for the Modern Web — A look at X3D and how it offers a simple declarative approach for including 3D visualizations into web pages.

Adrian Sureshkumar

How Taiko Compares to Other Browser Automation Tools

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Angular Dependency Injection Tips

Armen Vardanyan

▶ 11 Talks from JSFoo VueDay 2019 — Talks from a Vue conference that took place in India two weeks ago.

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🔧 Code & Tools

nanoSQL 2: A Universal 'Database Layer' for Client, Server and Mobile — Basically an abstraction for any JavaScript developers who want a database in their app. It can use numerous actual databases behind the scenes, including localStorage, IndexedDB, RocksDB, Redis, DynamoDB, ScyllaDB and SQLite. It claims to be like “Lego™ for databases”.

Scott Lott

React Suite 4.0: A Suite of 'Sensible' UI Components — A set of components that’s been under active development for a couple of years now. Supports React 16+, uses TypeScript, and they work on all major browsers. Components include things like buttons, modals, drawers, navigation bars, form input fields, tables, calendars, and more. GitHub repo.

HYPERS

Spacekit: A Library for Creating 3D Visualizations of Space — Here’s an example.

Ian Webster

Headroom.js: Hides Your Page Header Until Needed — A pure JS widget for hiding elements until needed (for example, show your page header when scrolling up).

Nick Williams

Automated Code Reviews for JavaScript — Set standards on coverage, duplication, complexity, and style issues and see real-time feedback in your Git workflow.

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Storytime: Tell Stories About Pieces of Code — This is hard to explain without a demo, so check out this explain demonstrating how React Fiber works.

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Emoji Button: A Vanilla JavaScript Emoji Picker — Turns a button element into an emoji picker (similar to that some operating systems provide).

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Filesize.js: A Library to Create Human Readable File Size Strings — For example: filesize(265318) returns 259.1 KB.

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⚡️ Quick Releases

Babel 7.6.0 (and 7.6.1) — Popular JavaScript transpiler.

mustache.js 3.1 — Logic-less JavaScript templating.

Bootstrap-Vue 2.0 — Plugins and components bringing Bootstrap to Vue.js.

🐦 An interesting Twitter thread...

Kyle Simpson, the author of YDKJS, has been thinking about some pain points when using asynchronous functions, particularly in relation to being able to cancel their execution when circumstances change. The whole thread is an interesting read, complete with people making suggestions of their workarounds.

We'd be pretty keen to link to any articles or opinion pieces covering this topic if you have any spare time this weekend ;-)

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