#Abstract classes in TypeScript

[removeload-academy]

A Beginner’s Guide to Using Abstract Classes in TypeScript

Abstract classes in TypeScript play a crucial role in building robust and scalable applications. They offer a powerful way to define a blueprint for derived classes, enabling developers to create flexible, reusable, and well-structured code.

[techentry]

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Data Types in SQL (e.g., INT, VARCHAR, DATE)

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Q.) What is C#, what are its main features, and why is it a good choice for software development?

A: Ans: C# is a versatile and powerful programming language developed by Microsoft. It's widely used for web, desktop, and game development, offering numerous career opportunities in software development.

Q: Why should I learn Angular?

A: Angular is a powerful framework for building dynamic, single-page web applications. Learning Angular can enhance your ability to create scalable and maintainable web applications and is highly valued in the job market.

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Q: What is React?

A: React is a JavaScript library developed by Facebook for building user interfaces, particularly for single-page applications where you need a dynamic and interactive user experience. It allows developers to create large web applications that can change data without reloading the page.

Q: Is C# suitable for beginners?

A: Yes, C# is an excellent language for beginners due to its simplicity and readability. It has a rich set of libraries and tools that make development easier, and it's well-documented, which helps new learners quickly grasp the concepts.

Q: Why use React?

A: React offers reusable components, fast performance through virtual DOM, one-way data flow, and a large community, making it ideal for developing dynamic user interfaces.

Q: What kind of projects can I create with C# and .NET?

A: With C# and .NET, you can create a wide range of projects, such as web applications, mobile apps (using Xamarin), desktop applications (Windows Forms, WPF), games (using Unity), cloud-based applications, and IoT solutions.

Q: What is JSX?

A: JSX is a syntax extension of JavaScript used to create React elements, which are rendered to the React DOM. React components are written in JSX, and JavaScript expressions within JSX are embedded using curly braces {}.

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[suncloudvn]

Dependency Injection là gì? Hiểu rõ và áp dụng trong lập trình

Trong phát triển phần mềm, đặc biệt là lập trình hướng đối tượng, các thành phần của một ứng dụng thường phụ thuộc lẫn nhau. Dependency Injection (DI) là một kỹ thuật quan trọng giúp quản lý sự phụ thuộc này một cách hiệu quả và linh hoạt. Bài viết này SunCloud sẽ giải thích chi tiết cho bạn Dependency Injection là gì, lợi ích của nó, các kiểu DI phổ biến và cách áp dụng nó trong các ngôn ngữ lập trình hiện đại.

1. Dependency Injection là gì?

Dependency Injection là một mẫu thiết kế (design pattern) cho phép một đối tượng nhận các phụ thuộc của nó từ bên ngoài thay vì tự tạo ra. Điều này giúp tách biệt các thành phần của ứng dụng, cải thiện tính bảo trì, khả năng kiểm thử và tái sử dụng mã nguồn.

2. Lợi ích của Dependency Injection

Dưới đây là một số lợi ích chính của Dependency Injection:

Tăng tính linh hoạt và dễ bảo trì: Bằng cách tách biệt sự phụ thuộc ra khỏi các lớp sử dụng chúng, DI giúp cho mã nguồn dễ dàng thay đổi và bảo trì hơn. Khi cần thay đổi một phụ thuộc, bạn chỉ cần thay đổi ở một nơi duy nhất, thay vì phải sửa đổi toàn bộ mã nguồn.

Cải thiện khả năng kiểm thử: DI làm cho việc kiểm thử dễ dàng hơn bằng cách cho phép sử dụng các đối tượng giả (mock objects) hoặc thay thế các phụ thuộc thực sự trong quá trình kiểm thử. Điều này đặc biệt hữu ích khi kiểm thử các thành phần phức tạp có nhiều phụ thuộc.

Tăng tính tái sử dụng mã nguồn: DI thúc đẩy việc viết mã nguồn có tính mô-đun cao, trong đó các thành phần độc lập có thể được tái sử dụng trong các ngữ cảnh khác nhau mà không cần thay đổi mã nguồn gốc.

3. Các loại Dependency Injection phổ biến

Constructor Injection

Trong kiểu này, các phụ thuộc được cung cấp thông qua hàm khởi tạo (constructor) của lớp. Đây là một trong những phương pháp phổ biến và dễ hiểu nhất để thực hiện DI.

Setter Injection

Setter Injection cung cấp các phụ thuộc thông qua các phương thức setter. Phương pháp này cho phép các phụ thuộc được thay đổi sau khi đối tượng được tạo ra.

Interface Injection

Interface Injection yêu cầu các đối tượng phụ thuộc phải triển khai một interface cụ thể để nhận các phụ thuộc của chúng. Mặc dù ít phổ biến hơn so với Constructor và Setter Injection, Interface Injection vẫn có thể hữu ích trong một số trường hợp.

4. Công cụ hỗ trợ Dependency Injection

Spring Framework (Java)

Spring là một framework phổ biến trong Java, cung cấp hỗ trợ mạnh mẽ cho DI thông qua Container IoC (Inversion of Control). Spring cho phép bạn cấu hình DI bằng cách sử dụng XML, Java Config hoặc Annotation.

.NET Core (C#)

.NET Core cung cấp một hệ thống DI tích hợp sẵn, giúp dễ dàng quản lý sự phụ thuộc trong các ứng dụng ASP.NET Core.

Angular (TypeScript)

Angular là một framework front-end phổ biến sử dụng TypeScript, cũng hỗ trợ DI một cách mạnh mẽ.

5. Lưu ý khi sử dụng Dependency Injection là gì?

Chỉ Inject những gì thực sự cần thiết: Tránh việc inject quá nhiều phụ thuộc vào một lớp. Điều này không chỉ làm phức tạp hóa mã nguồn mà còn làm giảm tính rõ ràng và dễ hiểu.

Sử dụng DI Container: Sử dụng các DI container như Spring, .NET Core DI container, hoặc Angular DI container để quản lý và cấu hình các phụ thuộc một cách hiệu quả, nhất quán.

Đảm bảo các thành phần độc lập: Thiết kế các thành phần của bạn để chúng có thể hoạt động độc lập và chỉ phụ thuộc vào các interface hoặc abstract class. Điều này giúp tăng cường khả năng tái sử dụng và kiểm thử.

Kết Luận

Dependency Injection là một kỹ thuật quan trọng trong phát triển phần mềm hiện đại, giúp quản lý các thành phần một cách hiệu quả và linh hoạt. Bằng cách áp dụng DI, bạn có thể tạo ra mã nguồn dễ bảo trì, dễ kiểm thử và có tính tái sử dụng cao. Việc hiểu rõ Dependency Injection là gì, sử dụng các công cụ hỗ trợ giúp bạn khai thác tối đa lợi ích của kỹ thuật này trong các dự án phần mềm của mình. Cùng tìm hiểu thêm các kiến thức công nghệ mới nhất tại suncloud.vn nhé.

Nguồn: https://suncloud.vn/dependency-injection-la-gi

[grandhotelabyss]

Those are large-scale reforms. Is there anything that the average person can do? You can start by valuing artists as much as you value what they make. Some years ago, the Urban Institute published a survey with a remarkable pair of findings. When asked whether they value the arts, 96 percent of respondents said yes. But when asked whether they value artists—think they “contribute ‘a lot’ to the general good of society”—only 27 percent said yes. Is there any other field in which there’s such a monumental gap between what we think of a thing and what we think of the people who bring us that thing? Art is loved; artists are disdained, disregarded, even despised. We need to acknowledge two points that ought to be obvious: if we don’t have artists, then we won’t have art; and the overwhelming majority of artists are not celebrities or superstars, not dilettantes or dabblers, but ordinary people who work hard to bring something valuable into the world.

William Deresiewicz, “Stages of Grief”

(To go back to this Arthur Miller quotation from earlier—

The trouble with literature is that writers have to be the ones who write it. [...] I don’t know of a first class piece of work written by what I would call, or a psychologist would call, a balanced, adjusted fellow who could easily be, let us say, a good administrator for a complicated social mechanism of some sort. It doesn’t work that way. We are not constituted that way; so consequently, to be sure, it will have to be partial. The impulse to do it is obsessive; it always is. One of the fairest, most just writers was Tolstoi, who was, to make it short, quite mad

—no, we’re not “ordinary people who work hard” and haven’t been since Shakespeare and Marlowe. Modernity is defined by specialization, an increase in differentiated functions: the shaman separates into doctor, psychologist, priest, artist, philosopher, scientist, and these subdivide in turn. While some of these roles—doctor, scientist, etc.—straightforwardly uphold modern society, that of the artist is different. The artist is both licensed fool and scapegoat, one who issues the “criticism of life” because uniquely sensitized to and therefore uniquely suffering from society’s ills. The idea that we could be salaried employees or state functionaries and still perform this task was always absurd. Only regression to pre-modernity rescinds the mandate to criticize and makes the artist simply another prop of the regime and disseminator of its legitimations; this is the ultimate meaning for art of wokeness, irrespective of wokeness’s ideological content—it could just as easily be Catholic integralism or America-Firstism, and maybe in the future it will be, as long as it makes the artist a quiescent propagandist. For anyone who remembers the legacy of Shakespeare, Marlowe, et al., this very memory makes such service too embarrassing to be endured, which is why the tradition must be purged and replaced by YA. Deresiewicz’s lament is understandable, but the logic of his argument leads where? To totalitarian scams like UBI? Anyone who, after the 20th century, wants to rely on the state to survive almost deserves the inevitable rude awakening. Otherwise, there’s breaking up the tech companies, which I would support, but that seems only a topical measure—as if that alone would bring back print culture and the midcentury, newspaper-grimed fingertips, typescripts marked up by Pat Covici, gin-and-tonic lunches, the CIA promoting abstract expressionism instead of intersectional feminism, and all the rest of it, which it won’t, because it’s not coming back. We need to figure out new ways to make money in new media landscapes while retaining our old independence; but if it becomes a trade-off, an old one or a new one, between the independence and the money, the money’s not worth it. In conclusion, please buy my books!)

[tecforfun]

Learn the fundamentals of Typescript classes in no time

In this post, I will be discussing TypeScript classes, which is a big topic in Object-Oriented Programming. To start, I will go over the essential features of TypeScript classes. In future posts, I will delve into the topic in greater detail and cover how TypeScript implements OOP concepts such as Inheritance and Polymorphism, as well as other topics such as Static, Generic, and Abstract classes.…

[angularcode]

A Beginner's Guide to AngularJS Programming

Angular is an open-source JavaScript framework that is used to create web applications. It is a powerful tool that makes developing applications easy. The framework is built using TypeScript, which is a powerful type system that provides an object-oriented syntactic structure. This makes the code more understandable.

Angular offers a high degree of abstraction, enabling users to develop and test large-scale applications with ease. It enables developers to build their own components and inject services in the application. In addition, it can be used to create modular services. A developer can use iterators, lambda operators, and TypeScript to perform type checking and unit testing.

Angular can also be used to build mobile applications. Using the Router service, developers can develop advanced in-browser navigation capabilities. They can also use service classes for data shared across components.

Another important feature is ng-bind, which is a base directive for routes. It establishes two-way data binding, making it possible for the framework to connect the DOM to the model. For example, when an expression is applied to an element, the value of the control will be replaced with the value of the expression.

Angular also offers the ability to use an if statement directive. This directive is called once when an element is initialized. If the conditions of the if statement are true, a new element is instantiated. Similarly, an element can be cloned when the clone flag is set to true.

Angular's structural and attribute directives allow developers to change the appearance and behavior of DOM elements. For instance, you can specify the behavior of a component by using the conditional show or hide element.

[khrtz]

ChatGPTに実用的なコードを実装させる

khrtz 振り返り Advent Calendar 2022 2日目です。

ChatGPT、時間潰れますね。

コードの実装を色々試していて、何となく使い方が分かってきたので共有します。割りと近い未来エンジニアはコードを書かなくて良くなるなと思いました。

ツイッタークライアントの実装を試しました。 今チャット形式で文字切れるので、実装して頂いた一部だけ抜粋。

public abstract class Repository<TEntity> where TEntity : Entity {    public abstract IEnumerator Load(int id, Action<TEntity> onSuccess, Action<Exception> onError); }public class TweetRepository : Repository<TweetEntity> {    public override IEnumerator Load(int id, Action<TweetEntity> onSuccess, Action<Exception> onError)    {        // ツイートデータを取得する処理を実装する    } }public class UserRepository : Repository<UserEntity> {    public override IEnumerator Load(int id, Action<UserEntity> onSuccess, Action<Exception> onError)    {        // ユーザデータを取得する処理を実装する    } }public class Entity {    public int Id { get; private set; } }public class TweetEntity : Entity {    public string Name { get; }    public string Text { get; }    public TweetEntity(int id, string name, string text)    {        Id = id;        Name = name;        Text = text;    } }public class UserEntity : Entity {    public string Name { get; }    public string ProfileImageUrl { get; }    public UserEntity(int id, string name, string profileImageUrl)    {        Id = id;        Name = name;        ProfileImageUrl = profileImageUrl;    } }public class Tweet {    private readonly TweetRepository _tweetRepository = new TweetRepository();    public void Load(int id, Action<TweetEntity> onSuccess, Action<Exception> onError)    {        _tweetRepository.Load(id, onSuccess, onError);    } }

一番ありがたいのはこのコードで、APIのEntiryを定義して、取得の流れを一通り書いてくれたことです。

public class TweetEntity {    public int Id { get; private set; }    public string Name { get; private set; }    public string Text { get; private set; } }public class TweetRepository {    private readonly string _apiBaseUrl = "https://api.twitter.com/1.1/statuses/show.json";    private readonly string _consumerKey = "YOUR_CONSUMER_KEY";    private readonly string _consumerSecret = "YOUR_CONSUMER_SECRET";    private readonly string _accessToken = "YOUR_ACCESS_TOKEN";    private readonly string _accessTokenSecret = "YOUR_ACCESS_TOKEN_SECRET";    public IEnumerator LoadTweet(int tweetId, Action<TweetEntity> onSuccess, Action<Exception> onError)    {        // Tweet を API から取得する処理        var request = new Dictionary<string, string>        {            { "id", tweetId.ToString() }        };        var authorizationHeader = GetAuthorizationHeader(_apiBaseUrl, "GET", request, _consumerKey, _consumerSecret, _accessToken, _accessTokenSecret);        var url = $"{_apiBaseUrl}?id={tweetId}";        var www = UnityWebRequest.Get(url);        www.SetRequestHeader("Authorization", authorizationHeader);        yield return www.SendWebRequest();        if (www.isNetworkError || www.isHttpError)        {            onError?.Invoke(new Exception(www.error));            yield break;        }        var responseJson = JsonUtility.FromJson<ResponseJson>(www.downloadHandler.text);        onSuccess?.Invoke(new TweetEntity        {            Id = tweetId,            Name = responseJson.User.Name,            Text = responseJson.Text        });    }    private string GetAuthorizationHeader(string url, string method, Dictionary<string, string> request, string consumerKey, string consumerSecret, string accessToken, string accessTokenSecret)    {        // OAuth 認証ヘッダーを作成する処理        var parameters = new SortedDictionary<string, string>(request);        var timestamp = ((int)(DateTime.UtcNow - new DateTime(1970, 1, 1)).TotalSeconds).ToString();        var nonce = Guid.NewGuid().ToString("N");        var signatureKey = string.Join("&",            UrlEncode(consumerSecret),            UrlEncode(accessTokenSecret)        );        var signatureBaseString = string.Join("&",            UrlEncode(method),            UrlEncode(url),            UrlEncode(string.Join("&", parameters.Select(x => string.Join("=", x.Key, x.Value)).ToArray()));        var signature = ComputeHash(signatureKey, signatureBaseString);        parameters.Add("oauth_consumer_key", consumerKey

このコードに到るまでの流れはこうです。

Webフロントエンドの最新のスタックを教えて

その技術(React, TypeScript)の実装をみせて

MVPの設計で実装して

MVPになってない

お望みはMVVMですか？サンプルコードです。

いやちゃんとMVPにして。->直った

これがサンプルです。

クリーンアーキテクチャに書き直して

この設計でツイッターのアプリを作って

EntityはRepository持たないで->じゃあInteractor追加しますね。

Unity, C#に書き直して

View, uGUIにして

もう少���実用的なコードにして(指示しないと簡略したものを出してくる)

この実装はいけてないからこうして、ああして

Entityだけ見せて

こうして

全体みせて

この流れで、レビューワー視点で色々突っ込みながら現場でも通用しそうなコードにしました。

設計を考える上でいいキャッチボール相手になってくれるのと、数秒で形にしてくれていいです。AIも設計について理解しているので自分の理解も深まります。Webや別言語のコードを、Unityに書き直してとかが簡単にできるのが凄いのと、「あとこのコードを動かすために足りないものは？」と聞くとビルド周りの設定やサーバー必要などを言ってきます。

あとコードを貼ると、処理の流れの説明をしてくれるので有り難いです。現時点のChatGPTでもそれなりに役立つと思います。チャット形式の限界もありますが、プルリクにして、実際にビルド回させたりできたらいいですね。ちなみにデザインの指示もできるみたいです。見栄え整えてとかCSSで装飾してとか。開発ツールに取り込まれていったら人間はコードを書くのではなく、実装の指示や設計の方に時間を割けるようになるのでいいですね。

[webfocus]

TypeScript

What is a Typescript development company?

We are early users of Microsoft TypeScript (TS), which we utilize in conjunction with a variety of JS-based frameworks to create faultless coding environments. This leads to quicker and higher-quality website and application delivery. WebFocus, as a top web development business, has skilled TypeScript developers on staff that investigates, innovate, and grasp the newest technologies for developing and delivering large-scale applications.

 Why Should You Choose TypeScript Development company?

If you select TypeScript Development company, it enhances the developer experience by extending JavaScript. It allows developers to provide type safety in their projects. TypeScript also includes features such as interfaces, type aliases, abstract classes, function overloading, tuples, generics, and so on. 

 JavaScript has been improved.

Amazing Versatility

Groundbreaking innovation

Wide Range

  What are the various Typescript development services?

WebFocus TypeScript professionals have vast expertise creating websites and applications with typescript’s rich capabilities. To offer bespoke TypeScript Applications to our clients, our developers study, create, and understand the newest TypeScript development services technology.

 Solution for Enterprise Applications

Development of Web Applications

Application Development in TypeScript

Services for Consultation

Quality Control and Testing

24*7 Maintenance and Support

Updating and Migrating

 What are the different frameworks used in Typescript development?

TypeScript has grown in popularity over the years, and several famous frameworks have begun to support it or have switched entirely to it. We will provide insights into the various frameworks created with TypeScript.

     Framework Nest.js

 Nest.js is a TypeScript framework inspired by Angular and the most popular in 2022. It was created using the Angular module framework. NestJS is a cutting-edge Node.js framework for creating scalable Node.js web applications using current Javascript and Typescript. It was established in 2018, and it has seen rapid acceptance and overtaken Node.js frameworks with the exception of Koa and Express, which remain quite popular in the Node.js and JavaScript ecosystems.

   Framework Feathers.JS

 Feathers is a lightweight web framework that may be used to create real-time apps and REST APIs in JavaScript or TypeScript web development companies. It is the second most popular Typescript framework, according to our statistics. Feathers.js has over 14k Github Stars and over 3.6k Github Usage at the time of writing. Furthermore, it has a greatest 3-month download record of 52k between April 17, 2022, and July 10, 2022, and most crucially, the codebase is composed of around 93.9% Typescript according to GitHub data.

  Framework for LoopbackJS

 Loopback 4 is a Typescript framework for creating microservices and APIs that is extremely scalable and adaptable. Loopback just updated to Typescript in version 4 of the framework, which is the topic of this article.

 As of the time of writing, Loopback had over 4.2k Github Stars and about 7,000+ Github Usage.

 Furthermore, it has the greatest 3-month download record of 58.9k between April 17, 2022, and July 10, 2022, and most crucially, the codebase is composed of around 74.5% Typescript according to GitHub data.

 How much do Typescript Development Services cost?

There’s no denying that TypeScript development outsourcing reputation is skyrocketing while keeping exceptionally high levels of developer engagement. Unfortunately, being an upgrade over JavaScript and an expansion of its syntax has a cost – it necessitates creating more code, which takes more work and costs more money. Expenditures are difficult to generalize because labor prices vary so greatly among nations, but we make certain that costs normally fit within the authorized budgets. Inform the details so that you can receive a reaction within 24 hours.

 To read full content of the website visit :  best typescript outsourcing company

[data-structures-cheat-sheve]

data structures cheat sheet new TWR%

💾 ►►► DOWNLOAD FILE 🔥🔥🔥🔥🔥 We summarize the performance characteristics of classic algorithms and data structures for sorting, priority queues, symbol tables, and graph. This cheat sheet uses Big O notation to express time complexity. For a reminder on Big O, see Understanding Big O Notation and Algorithmic Complexity. Know Thy Complexities! · Big-O Complexity Chart · Common Data Structure Operations · Array Sorting Algorithms · Learn More · Get the Official Big-O Cheat Sheet. GitHub - tajpouria/algorithms-and-data-structures-cheat-sheet: A brief overview of common algorithms, data structures, and problem-solving patterns. 9 A brief overview of common algorithms, data structures, and problem-solving patterns explained in plain javascript. Work fast with our official CLI. Learn more. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. There was a problem preparing your codespace, please try again. It allows us to talk formally about how the runtime of an algorithm grows as the input grows. O n : maybe thinking O 2n but we see the big picture! BigONotation doesn't care about precision only about general trends linear? A data structure which every element has a priority. Elements with higher priorities are served before elements with lower priorities. In the following example, we implemented a priority queue using minBinaryHeap but you should know binaryHeaps and priority queue is two different concepts and we just use abstract of it. A graph data structure consists of a finite and possibly mutable set of vertices or nodes or points, together with a set of unordered pairs of these vertices for an undirected graph or a set of ordered pairs for a directed graph. It's a method for solving a complex problems by breaking it down into a collection of simpler problems, solving their subProblems once and storing their solutions. Storing the expensive function class results and returning the cached result when the same inputs occur again. Skip to content. Star This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Branches Tags. Could not load branches. Could not load tags. Launching Xcode If nothing happens, download Xcode and try again. Launching Visual Studio Code Your codespace will open once ready. Latest commit. Git stats 88 commits. Failed to load latest commit information. Apr 25, Sep 12, Merge branch 'master' of github. May 1, Updated: May 2, Sep 3, Sep 8, View code. Big O Notation time complexity space complexity quick note around the object, array through BigO lens! Common Patterns frequency counter multiple pointers sliding window divide and conquer Recursion Searching Algorithms linear search binary search naive string search Sorting Algorithms array. Big O Notation time complexity It allows us to talk formally about how the runtime of an algorithm grows as the input grows. About A brief overview of common algorithms, data structures, and problem-solving patterns explained in plain javascript. Topics javascript typescript algorithms datastructures. Contributors 3. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window.

[removeload-academy]

Abstract Class in TypeScript

Are you looking to deepen your understanding of TypeScript’s object-oriented programming capabilities? Abstract classes in TypeScript are a powerful feature that allows you to define blueprints for other classes while preventing direct instantiation.

[data-structures-cheat-shesp]

data structures cheat sheet free 4072!

💾 ►►► DOWNLOAD FILE 🔥🔥🔥🔥🔥 We summarize the performance characteristics of classic algorithms and data structures for sorting, priority queues, symbol tables, and graph. This cheat sheet uses Big O notation to express time complexity. For a reminder on Big O, see Understanding Big O Notation and Algorithmic Complexity. Know Thy Complexities! · Big-O Complexity Chart · Common Data Structure Operations · Array Sorting Algorithms · Learn More · Get the Official Big-O Cheat Sheet. GitHub - tajpouria/algorithms-and-data-structures-cheat-sheet: A brief overview of common algorithms, data structures, and problem-solving patterns. 9 A brief overview of common algorithms, data structures, and problem-solving patterns explained in plain javascript. Work fast with our official CLI. Learn more. If nothing happens, download GitHub Desktop and try again. If nothing happens, download Xcode and try again. There was a problem preparing your codespace, please try again. It allows us to talk formally about how the runtime of an algorithm grows as the input grows. O n : maybe thinking O 2n but we see the big picture! BigONotation doesn't care about precision only about general trends linear? A data structure which every element has a priority. Elements with higher priorities are served before elements with lower priorities. In the following example, we implemented a priority queue using minBinaryHeap but you should know binaryHeaps and priority queue is two different concepts and we just use abstract of it. A graph data structure consists of a finite and possibly mutable set of vertices or nodes or points, together with a set of unordered pairs of these vertices for an undirected graph or a set of ordered pairs for a directed graph. It's a method for solving a complex problems by breaking it down into a collection of simpler problems, solving their subProblems once and storing their solutions. Storing the expensive function class results and returning the cached result when the same inputs occur again. Skip to content. Star This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository. Branches Tags. Could not load branches. Could not load tags. Launching Xcode If nothing happens, download Xcode and try again. Launching Visual Studio Code Your codespace will open once ready. Latest commit. Git stats 88 commits. Failed to load latest commit information. Apr 25, Sep 12, Merge branch 'master' of github. May 1, Updated: May 2, Sep 3, Sep 8, View code. Big O Notation time complexity space complexity quick note around the object, array through BigO lens! Common Patterns frequency counter multiple pointers sliding window divide and conquer Recursion Searching Algorithms linear search binary search naive string search Sorting Algorithms array. Big O Notation time complexity It allows us to talk formally about how the runtime of an algorithm grows as the input grows. About A brief overview of common algorithms, data structures, and problem-solving patterns explained in plain javascript. Topics javascript typescript algorithms datastructures. Contributors 3. You signed in with another tab or window. Reload to refresh your session. You signed out in another tab or window.

[tonkibasic]

Linked list stack implememntation using two queues 261

Linked list stack implememntation using two queues 261 code#

Fortunately, JavaScript arrays implement this for us in the form of the length property. algorithms (sorting, using stacks and queues, tree exploration algorithms, etc.). A common additional operation for collection data structures is the size, as it allows you to safely iterate the elements and find out if there are any more elements present in the data structure. Data structures: Abstract data types (ADTs), vector, deque, list, queue. Again, it doesn't change the index of the other items in the array, so it is O(1). Similarly, on pop, we simply pop the last value from the array. As it doesn't change the index of the current items, this is O(1). On push, we simply push the new item into the array. Therefore, we can simply implement the operations of this data structure using an array. Fortunately, in JavaScript implementations, array functions that do not require any changes to the index of the current items have an average runtime of O(1). First node have null in link field and second node link have first node address in link field and so on and last node address in. which is head of the stack where pushing and popping items happens at the head of the list. In stack Implementation, a stack contains a top pointer. You will use only one C file (stackfromqueue.c)containing all the functions to design the entire interface. The objective is to implement these push and pop operations such that they operate in O(1) time. A stack can be easily implemented using the linked list. Part 3: Linked List Stack Implementation Using Two Queues Inthis part, you will use two instances of Queue ADT to implement aStack ADT. This fact can be modeled into the type system by using a union of T and undefined. If there are no more items, we can return an out-of-bound value, for example, undefined. The other key operation pops an item from the stack, again in O(1). The first one is push, which adds an item in O(1). StdOut.java A list implemented with a doubly linked list. js is the open source HTML5 audio player. The stack data structure has two key operations. js, a JavaScript library with the goal of making coding accessible to artists, designers, educators, and beginners. We can model this easily in TypeScript using the generic class for items of type T. Using Python, create an implementation of Deque (double-ended queue) with linked list nodes.

Linked list stack implememntation using two queues 261 code#

So deleting of the middle element can be done in O(1) if we just pop the element from the front of the deque.A stack is a last-in/first-out data structure with key operations having a time complexity of O(1). I encountered this question as I am preparing for my code interview. The stack functions worked on from Worksheet 17 were re-implemented using the queue functions worked on from Worksheet 18. Overview: This program is an implementation of a stack using two instances of a queue. Here each new node will be dynamically allocated, so overflow is not possible unless memory is exhausted. Using an array will restrict the maximum capacity of the array, which can lead to stack overflow. You must use only standard operations of a queue - which means only push to back, peek/pop from front, size, and is empty operations are valid. The advantage of using a linked list over arrays is that it is possible to implement a stack that can grow or shrink as much as needed. empty () - Return whether the stack is empty. We will see that the middle element is always the front element of the deque. Stack With Two Queues (Linked List) Zedrimar. pop () - Removes the element on top of the stack. If after the pop operation, the size of the deque is less than the size of the stack, we pop an element from the top of the stack and insert it back into the front of the deque so that size of the deque is not less than the stack. The pop operation on myStack will remove an element from the back of the deque. The number of elements in the deque stays 1 more or equal to that in the stack, however, whenever the number of elements present in the deque exceeds the number of elements in the stack by more than 1 we pop an element from the front of the deque and push it into the stack. Insert operation on myStack will add an element into the back of the deque. We will use a standard stack to store half of the elements and the other half of the elements which were added recently will be present in the deque. Method 2: Using a standard stack and a deque ISRO CS Syllabus for Scientist/Engineer Exam.ISRO CS Original Papers and Official Keys.GATE CS Original Papers and Official Keys.

[swarnalata31techiio]

Differences between JavaScript and Typescript

What is TypeScript?

By definition, “TypeScript is JavaScript for application-scale development.”

TypeScript is a strongly typed, object-oriented, compiled language. It was designed by Anders Hejlsberg (designer of C#) at Microsoft. TypeScript is both a language and a set of tools. TypeScript is a typed superset of JavaScript compiled to JavaScript. In other words, TypeScript is JavaScript plus some additional features.

What is JavaScript?

JavaScript is a programming language that executes on the browser. It turns static HTML web pages into interactive web pages by dynamically updating content, validating form data, controlling multimedia, animating images, and almost everything else on the web pages.

JavaScript is the third most important web technology after HTML and CSS. JavaScript can be used to create web and mobile applications, build web servers, create games, etc.

Advantage of TypeScript over JavaScript

TypeScript always highlights errors at compilation time during the time of development, whereas JavaScript points out errors at the runtime.

TypeScript supports strongly typed or static typing, whereas this is not in JavaScript.

TypeScript runs on any browser or JavaScript engine.

Great tooling supports with IntelliSense which provides active hints as the code is added.

It has a namespace concept by defining a module.

The disadvantage of TypeScript over JavaScript

TypeScript takes a long time to compile the code.

TypeScript does not support abstract classes.

If we run the TypeScript application in the browser, a compilation step is required to transform TypeScript into JavaScript.

[srishticampus]

TOP 10 NEW FEATURES & UPDATES OF ANGULAR 12

Angular 12 is now added in the latest addition to Google's popular TypeScript. Released in May of 2021, the framework comes with many extras like bug fixes, performance improvement, and features. As a learner of the Angular framework, staying updated with all the latest additions is vital.

Srishti Campus is the best Angular training center.

Hop into the ten latest additions to Angular 12 to keep abreast of the add-ons

Towards Ivy

The Angular team had consistently worked on the objective of integrating the Angular ecosystem on Ivy. The current libraries will be working on the Ivy app by depreciating the old View Engine. The library authors will now be working on moving towards Ivy to keep up.

To have a comprehensive understanding, Srishti Campus is the best training center.  

Uncertain Protractor

There are speculations about not involving Protractor in the upcoming projects by the team. Currently, the feedback is under trial in the RFC. However, the community is working on exploring popular third party solutions available in Angular CLI. At present, the community of developers are working with Cypress, TestCafe, and Webdrive for elective solutions.

Nullish Coelsing

For writing a cleaner code, the nullish coalescing operator has been in the league for some time. Updating the Angular applications now helps simplify the process of conditional statements.

Here's how the new update makes coding easier:

{{age !== null && age !== undefined ? age : calculateAge() }}

{{age ?? calculateAge() }}

TypeScript 4.2

Several updates have been made for Angular 12, including improvements in type alias, abstract classes, tuple types, and operators. No important variables or information will appear randomly by improving the in-operator. Infact, the improved version returns valid handles and suitable types, thereby lessening the errors and repetition.

New Styling

Along with the several changes made in the styling, the support for inline SaaS in the style field and component decorators is significant. Moreover, a brand new SaaS model has been adopted by Angular Material and CDK.

Tailwind CSS's support is also made by this version of Angular, given its development and popularity in the Tailwind community.

A Strict Module

Enabling the strict mode by default in CLI has added another feature. With this, catching bugs and better maintenance becomes more manageable. Application examinations are also made way quicker than before with the update.

New Dev Tools

Access to Angular Dev Tools was enabled after the release of Angular 12. After every preview, the embedded profiler can now capture the changed detection. It can be later monitored to figure out the delay detection cycle.

A New Learning Experience

With the aim of improving the learning experience of developers, Angular 12 has also brought some crucial changes for an improved learning experience. This can be noticed in the Angular 12 documentation with a content projection guide.

Along with it, the contributors guide will also aid the developers in elevating the basic understanding of a project documentation. A few useful tips and guides on debugging have also been shared.

A change from the i18n framework

The message-id designs were used in the i18n framework. However, this thought could be put on hold. Angular 12 has added a new and improved intuitive ID format that decreases the cost of invalidation and retranslation. The belated design is comparatively complex yet natural.

Inbuilt Production Build

Presently, the ng build command comes with improved results. However, in the new Angular 12, the production build will come by default

Srishti campus provides the best angular training in Trivandrum

[75waytechnologies]

Technologies A MERN Stack Developer Should Learn in 2022

According to the recent study, MERN stack will experience a significant rise in usage in the coming years as more and more applications are now developed in JavaScript. It is considered the most efficient programming language that serves both the front-end and back-end. MERN stack can handle every aspect of web and mobile app development.

The more this technology stack is gaining wide popularity worldwide, the more creative minds are showing high interest in MERN stack learning. 2022 also gives birth to new opportunities for MERN stack developers, but at the same time, it demands to be proficient in related technologies to master the MERN stack. But what are crucial technologies that require the MERN stack developer’s attention?

From React to NextJS, 2022’s top technologies can help you shape into a MERN stack developer, which you might be passionate about. This blog has covered in-depth MERN stack-related technologies.

So, let’s dive into the main stuff without wasting a minute.

TypeScript

The first on our list is TypeScript. This technology arms a developer with the pre-eminent features that help build big projects. If you’re looking for the right technology to assist you in a big project and has the potential to resolve bugs or issues that pop up while coding, TypeScript would be your best bet. It is widely used in a number of production levels of projects, giving more reasons to developers to learn in 2022.

Pros:

TypeScript identifies 15 percent of bugs at the assembly stage. It can spot bugs early and saves time.

Adding strict types and other elements makes the code self-expressive and easy to read.

Rich IDE support includes Web Storm, WebStorm, Eclipse, Visual Studio Code, Atom, and CATS.

Cons:

It takes a long time for code compilation.

TypeScript doesn’t support abstract classes.

Companies won’t hit 100 percent productivity immediately without having experience in TypeScript.

React-Query

What’s next? React-Query is another technology you should master in 2022 to give an edge to your career as a MERN stack developer. But what exactly is React-Query? It is an NPM package that is used to fetch data from an API. Doesn’t this definition sound simple? Yes, this is what we have found to help you understand this technology more precisely. There is a high chance the question may arise in your mind- Are Redux with Axios the same? Well, both are the same but the React-Query comes with several features, including infinite scroll, garbage collection, auto catching, and a lot more that enhance developer performance and end them up with great technology, fueling up their MERN stack development learning.

Pros:

Automatic caching of data

Super clean syntax

Prefetching

Automatic fetching of fresh data on user actions

Using cached data

Tailwind CSS

In order to sharpen your skills in MERN stack development, you must have good hands-on Tailwind CSS. This is something that excites developers more than other technologies like Bootstrap, Bulama and Materialize CSS.

Tailwind CSS is a highly customizable, low-level CSS framework and the ultimate technology one can use to create stunning and feature-rich websites. It is entirely different technology from other CSS frameworks and has and

Pros:

Tailwind is a faster framework than any other framework when styling HTML.

Tailwind is a responsive, mobile-friendly CSS framework. It has pre-built classes that allow a developer to design the layout directly in the HTML file.

This CSS framework works in the website front-end, making it a reasonable choice for developers who want ultimate responsiveness.

Cons:

Learning how to use and utilize the pre-built classes is a challenge for developers. It takes time to learn.

Tailwind lacks significant styling components. You have to manually add the features required for web apps.

NextJS

Our list is incomplete without discussing NextJS, one of the important components of the MERN stack. If you’re a React developer, then learning this new technology will be pretty smooth. T brings so many benefits that make it worth learning this 2022 to master MERN stack development skills. From server-side rendering to automatic image optimization, NextJS offers several perks that make it a highly recommended technology for React devs.

Pros:

NextJS encourages your website or application to be safe and secure.

NextJS can adapt to the size of apps and websites to fit the screen size and enhance the user experience.

It uses SSG that helps deliver flash performance for rendering pages.

The community of developers working with NextJS is very vast, and hence provides excellent support.

Cons:

The time NextJS takes to build websites and apps is restricted.

No built-in state manager is available in the NextJS framework. Another tool is required to get the most out of one.

React Native

Learn once, write anywhere concept of React Native gains many developers' interests. It allows you to create native apps without compromising the user experience. Such an ease adds this technology to our 2022 list. It’s a valuable skill to learn this year to become an expert MERN stack developer.

Websites are great, but the ease applications provide are just unmatchable. It ends up with more users on a project. Well, many perks make React Native a good choice for developers.

Pros:

React Native ensures a stable mobile app growth as the framework components know how to display an app on popular platforms.

You can enjoy a lower cost of add development with React Native.

It supports hot reloading that allows developers to know how changes made to the code affect the app while it’s running.

React Native’s code reusability feature saves a lot of time for developers and encourages faster development.

Cons:

Developers might face various issues with debugging tools or package compatibility .

React Native apps are built using Java, C/C++, JavaScript, etc., which makes it very hard to debug for developers.

The testing process in native development can eat up a lot of time.

Advanced JavaScript

What does Advanced JavaScript mean? It basically includes V8 Engine, closures, threads, binding, hoisting, event loop, etc. A good grasp over JavaScript is crucial to master MERN stack as this technology stack is fully JavaScript. We suggest you first learn Javascript and then move to its advanced stage.

Pros

JavaScript is an interpreted language that takes less time for compilation.

Easy to understand and learn.

All modern browsers support JavaScript

Provides various interfaces for creating catchy webpages.

JavaScript is now capable of front-end as well as back-end development.

Cons

JavaScript only supports single inheritance and not multiple inheritance.

It is not efficient in the debugging process.

JavaScript code is viewable to the user. It means others may use it for malicious purposes.

Conclusion

This is all about the technologies a MERN stack developer should learn in 2022. There is no second thought that the demand for MERN stack development will rise in the coming years. So, it is imperative to learn new technology skills to become a pro in MERN stack. And in this regard, this blog is best for you.

You can also reach out to 75way and talk to our experts to learn more about MERN stack development. We can help you in this journey. Our experts are knowledgeable and experienced. And if you want an expert for MERN stack development, 75way is the right name.

[ittechnicalandnontechnical]

TypeScript Vs JavaScript: Come Face To Face In Battleground

To be quite clear, each of your JavaScript codes is valid in TypeScript; which denotes that TypeScript is a bigger picture or bigger scope of JavaScript. In simple terms,

JavaScript + extra features = Typescript

Hence, if you save your (.js) JavaScript file with (.ts) TypeScript extension, it will work just as fine. However, do not misunderstand that JavaScript and TypeScript are the same. This guide states the basic differences between both of them. Without much introduction, let’s get a brief overview of these languages!

Why TypeScript If We Already Have JavaScript?

Initially, when JavaScript was introduced, the development team announced JavaScript as a client-side programming language. However, when developers started implementing and using the language, they discovered that JavaScript could also be utilized as a server-side programming language.

That said, JavaScript gained huge popularity in no time. Meanwhile, during its growth, JavaScript’s code became considerably heavy and complex. As a result, JavaScript can no more be considered an Object-oriented programming language. This is a major factor restraining JavaScript from reaching the heights at enterprise levels as a server-side technology. To overcome this gap, TypeScript was built and introduced by the development team.

Benefits Of TypeScript Over JavaScript

TypeScript supports static typing, unlike JavaScript. This denotes that static typing enables checking on the type appropriateness at the compile-time.

TypeScript possesses a feature of strongly-typed, which lacks in JavaScript.

TypeScript has a namespace concept by elaborating a module.

TypeScript can easily run on any JavaScript engine or browser.

TypeScript identifies compilation errors right at the developmental stage. Due to this feature, the chances to mark errors at the runtime becomes considerably less and minor. On the other hand, JavaScript marks errors at the runtime.

TypeScript has excellent tooling support due to its IntelliSense. It offers active hints to the language as the code gets added.

Drawbacks Of TypeScript Over JavaScript

TypeScript fails to support abstract classes.

TypeScript is time-consuming when it comes to code compilation.

Read More: Should TypeScript Replace JavaScript?