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Tag: asynchronous JavaScript

  • JavaScript Tutorial Roadmap

    Introduction to JavaScript

    What is JavaScript?

    JavaScript is a high-level, interpreted programming language used to create dynamic, interactive, and responsive web applications. It runs in the browser as well as on servers (using Node.js).

    Importance of JavaScript in Web Development

    • Core technology of the web (HTML, CSS, JavaScript)
    • Enables interactivity and dynamic content
    • Used for frontend, backend, mobile apps, and desktop apps
    • Supported by all modern browsers

    Basic JavaScript Syntax

    Adding JavaScript to HTML

    • Inline JavaScript
    • Internal scripts
    • External JavaScript files

    Variables and Data Types

    Variables

    • Declaring variables using var, let, and const

    Data Types

    • Primitive data types (Number, String, Boolean, Undefined, Null, Symbol)
    • Reference data types (Object, Array, Function)

    Constants

    • Declaring immutable values using const

    Operators in JavaScript

    Arithmetic Operators

    • Addition, subtraction, multiplication, division, modulus

    Comparison Operators

    • ==, ===, !=, !==, >, <, >=, <=

    Logical Operators

    • AND (&&), OR (||), NOT (!)

    Assignment Operators

    • =, +=, -=, *=, /=

    Conditional (Ternary) Operator

    • Writing concise conditional expressions

    Control Structures

    Conditional Statements

    • if statement
    • if-else statement
    • else-if ladder
    • switch statement

    Loops

    • for loop
    • while loop
    • do-while loop

    Functions in JavaScript

    Function Declaration

    • Defining reusable functions

    Function Expression

    • Assigning functions to variables

    Arrow Functions

    • Shorter function syntax using =>

    Callback Functions

    • Passing functions as arguments

    Higher-Order Functions

    • Functions that return or accept other functions

    Objects and Arrays

    Objects

    • Creating and accessing object properties

    Arrays

    • Creating arrays
    • Accessing and modifying array elements

    Array Methods

    • map(), filter(), reduce(), forEach()

    DOM Manipulation

    Selecting Elements

    • getElementById
    • querySelector
    • querySelectorAll

    Modifying Elements

    • Changing text, HTML, and styles

    Event Handling

    • Adding event listeners
    • Handling user interactions

    ES6 (ECMAScript 2015) Features

    let and const

    • Block-scoped variables

    Template Literals

    • String interpolation using backticks

    Destructuring

    • Extracting values from arrays and objects

    Spread and Rest Operators

    • Expanding and collecting values

    Modules

    • Importing and exporting JavaScript modules

    Asynchronous JavaScript

    Callbacks

    • Handling asynchronous operations

    Promises

    • Managing async operations with .then() and .catch()

    Async / Await

    • Writing asynchronous code in a synchronous style

    Error Handling in JavaScript

    try…catch

    • Catching runtime errors

    Throwing Errors

    • Using throw keyword

    Custom Errors

    • Creating custom error objects

    Advanced JavaScript Topics

    Closures

    • Functions with preserved lexical scope

    this Keyword

    • Understanding context in JavaScript

    Prototypes and Inheritance

    • Prototype chain and object inheritance

    Classes

    • ES6 class syntax

    Modules

    • Organizing code using modules

    JavaScript Best Practices

    Writing Clean and Maintainable Code

    • Naming conventions
    • Code readability and structure

    Debugging Techniques

    • Browser developer tools
    • Console debugging

    Performance Optimization

    • Reducing DOM manipulation
    • Optimizing loops and functions