JavaScript

JavaScript powers interactive web applications. Here, you’ll explore fundamental and advanced concepts including variables, scope, closures, prototypes, asynchronous programming, promises, async/await, event loop, and DOM manipulation. This page also includes JavaScript interview questions to help you prepare for technical assessments and frontend developer interviews.

Basics & Syntax

Learn JavaScript fundamentals including syntax rules, statements, comments, keywords, and basic program structure.

Variables & Data Types

Understand JavaScript variables (var, let, const) and data types including primitive and reference types.

Operators & Expressions

Covers arithmetic, comparison, logical, assignment, ternary, and special JavaScript operators.

Control Flow

Learn decision-making and loops including if-else, switch, for, while, do-while, and break/continue.

Functions

Deep dive into JavaScript functions including declarations, expressions, arrow functions, parameters, and return values.

Scope, Hoisting & TDZ

Understand JavaScript scope (global, block, function), hoisting behavior, and the Temporal Dead Zone.

Closures

Learn how closures work in JavaScript and why they are important for data privacy and advanced patterns.

Objects

Covers JavaScript objects, properties, methods, object creation, destructuring, and prototypes.

Arrays

Master JavaScript arrays including methods like map, filter, reduce, and array iteration techniques.

Strings & Numbers

Learn string and number manipulation, built-in methods, parsing, formatting, and edge cases.

Destructuring & Spread/Rest

Learn object and array destructuring, spread syntax, and rest parameters with real-world use cases.

ES6+ Features

Explore modern JavaScript features like let/const, arrow functions, template literals, modules, and more.

JavaScript

Basics & Syntax

Variables & Data Types

Operators & Expressions

Control Flow

Functions

Scope, Hoisting & TDZ

Closures

Objects

Arrays

Strings & Numbers

Destructuring & Spread/Rest

ES6+ Features

Execution Context

Call Stack & Memory Management

Asynchronous JavaScript

Callbacks

Promises

Async / Await

Event Loop

Microtasks & Macrotasks

Error Handling

Debugging Techniques

DOM Basics

DOM Manipulation

Events & Event Delegation

Browser APIs

Fetch API & Networking

LocalStorage, SessionStorage & Cookies

Prototypes

Inheritance

Classes

this Keyword

call, apply, bind

Functional Programming Concepts

Currying & Composition

Performance Optimization

Debouncing & Throttling

Memoization

Design Patterns

Module Systems

Security Concepts (XSS, CSRF)

Testing Basics

JavaScript Best Practices

Common Interview Traps

Coding Problems – Arrays

Coding Problems – Strings

Coding Problems – Objects

Coding Problems – Recursion

Coding Problems – Promises

DOM Coding Problems