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If you’re preparing for a JavaScript interview , chances are you’ll come across questions like: Is JavaScript single-threaded or multi-threaded? How does JavaScript handle asynchronous tasks? What is the event loop, and how does it work? These are fundamental concepts that every JavaScript developer should understand — not only for interviews but also for writing efficient, non-blocking code. Let’s break them down clearly 👇 🧠 Question 1: Is JavaScript Single-Threaded or Multi-Threaded? The short answer is: 👉 JavaScript is single-threaded. That means it can execute only one task at a time on a single main thread . This single thread handles: Code execution Function calls Event handling DOM updates (in browsers) So, when you run JavaScript, it processes your code line by line , synchronously . If one piece of code takes too long to finish, the rest of the program must wait — this is called blocking . ⚙️ Question 2: How Does JavaScript Handle Asynchronous Task...

The @compodoc/compodoc dependency is a documentation tool for Angular applications. It generates detailed static documentation for your Angular project based on its TypeScript code, including: 📌 Key Features of @compodoc/compodoc Generates Documentation 📖 Extracts comments from your TypeScript files and creates structured documentation. Supports JSDoc-style comments ( /** ... */ ). Provides a Web-Based UI 🎨 The generated documentation includes an interactive UI with search functionality. Supports Angular-Specific Concepts 🛠️ Components, Services, Modules, Directives, Pipes, Interfaces, etc. Includes Graphs & Diagrams 📊 Displays project structure using dependency graphs. Supports Markdown Files 📝 You can add README.md , changelog.md , and other Markdown files to the docs. 📌 How to Use @compodoc/compodoc ? ✅ Install It npm install --save-dev @compodoc/compodoc ✅ Generate Documentation Run the following command to gener...

 Here’s a simple approach to find and remove unused dependencies in your Ionic 3 & Angular 5 app: Steps to Remove Unused Dependencies 1. Identify Unused Dependencies Use the depcheck tool to check which dependencies are unused. Install depcheck globally npm install -g depcheck Run depcheck in your project root depcheck It will list: Unused dependencies (can be removed) Missing dependencies (need to be installed) 2. Remove Unused Dependencies Once identified, uninstall them: npm uninstall package-name Or remove multiple at once: npm uninstall package1 package2 package3 3. Check Cordova Plugins Run: cordova plugin list Manually remove unnecessary plugins: cordova plugin remove plugin-name 4. Clean node_modules and Reinstall rm -rf node_modules package-lock.json npm install 5. Optimize Your Build Run: npm run build --prod to ensure performance improvements.

 🚀 Introduction Docker has revolutionized the way developers build, ship, and run applications. It provides a containerized environment that ensures consistency across different machines, making it a great choice for deploying Angular applications . In this guide, we’ll walk through the process of setting up, containerizing, and running an Angular project with Docker. Whether you’re a beginner or an experienced developer, this tutorial will help you streamline your Angular development workflow with Docker. Why Use Docker for Angular? 🔹 Eliminates “It works on my machine” issues 🔹 Simplifies setup with pre-configured environments 🔹 Ensures consistency across different operating systems 🔹 Eases deployment to cloud services 🔹 Makes CI/CD integration smoother Step 1: Install Docker Desktop To begin, you need Docker Desktop installed on your system. 🔹 Download Docker Desktop : Docker Hub 🔹 Choose the platform (Windows, macOS, or Linux) 🔹 Install and restart your system 🔹...

  Angular topics Installation Components Module Data Binding Parent-child communication (@Input, @Output) String interpolation {{}} One-Way Binding - Custom, Property Binding Two Way Binding [(ngModel)] Directives Component directive <app-root></app-root> Attribute directive ngClass, ngStyle, ngModel Structural directive ngIf, ngFor, ngSwitch LifeCycle Hooks Host Binding & Attribute Directives Custom Directives Structural Directives Pipes Dependency Injection (DI) Services Routers Router Guard HTTP client Forms Template Driven Reactive FormRouters @ViewChild @ViewChildren Ng-content @ContentChild @ContentChildren Ng-template Ng-container Pipe RxJs Stream Observables Subscription Unit Testing Karma Jasmin Angular Material Animation Progressive Web Apps (PWA) REST API with NestJS and mongoDB Firebase, Firestore and AngularFire

JAVASCRIPT What is hoisting? Its mechanism Variable and function declarations are moved to the top of their scope before code execution. console.log(x) //undefined var x = 10 console.log(x) // print 10 console.log(y+z) //reference error let y = 10 const z = 10 --------------------------------------------------------------------------------------------------------------------------- Difference between let and var? --------------------------------------------------------------------------------------------------------------------------- What are let, var, and const in javascript? let - block scoped, redeclared not supported in same scope const - block scoped, redeclared or redesigned are not supported var - function scoped, redeclared and redesigned are supported function scope  function test(){ var a = 10; var a = "mani";  //redeclared and redesigned are supported with the scope } block scope if(test){ let a = 10; let b = 11; //error if(tt){ let b = 12; //working } } if(test) ...

 Extract/Read data from Excel document in Angular EXCEL DATA RESULT Install node library: npm i  xlsx Dependency Link Import XLSX Package import * as XLSX from 'xlsx' ; Install node library: <input type="file" (change)="onFileChange($event)"> Event to extract data from Excel document in typescript: onFileChange ( event: any ) { /* wire up file reader */ const target : DataTransfer = < DataTransfer >(event. target ); if (target. files . length !== 1 ) { throw new Error ( 'Cannot use multiple files' ); } const reader : FileReader = new FileReader (); reader. readAsBinaryString (target. files [ 0 ]); reader. onload = ( e: any ) => { /* create workbook */ const binarystr : string = e. target . result ; const wb : XLSX . WorkBook = XLSX . read (binarystr, { type : 'binary' }); /* selected the first sheet */ const wsname : string = wb. SheetNames ...