Find two numbers in array that add up to target

Find maximum sum subarray using dynamic programming

Find container that holds the most water using two pointers

Calculate how much water can be trapped after raining

Find length of longest consecutive sequence in unsorted array

Find the longest substring without repeating characters

Find maximum profit from buying and selling stock once

Rotate array elements by k positions to the right using the elegant 3-step reversal technique

Find second largest element in array efficiently

Remove duplicate elements from array efficiently

Flatten nested arrays to specified depth or completely

Check if string of brackets is valid using stack data structure

Find maximum element in each sliding window of size k

Check if two strings are anagrams using character frequency counting

Classic recursion problems: factorial, fibonacci, string reversal, and subsets generation using backtracking. Covers advanced concepts like memoization and call stack mechanics.

Limit function execution frequency for performance optimization

Control function execution rate to limit calls per time period

Transform function to accept arguments one at a time

Cache function results to optimize performance

Create deep copy of objects and arrays recursively

Simple implementations of array methods map, filter, reduce

Understanding Promise.all, allSettled, race, and any methods

Combine multiple functions to create new functionality

Handle events efficiently using event bubbling and delegation

Flatten nested objects into single-level objects with dot notation

Custom implementations of call, apply, and bind methods

Understanding 'this' context and implementing method chaining

Function types, IIFE patterns, and function expressions

Accurate type detection for all JavaScript data types

String manipulation using split and join methods with practical examples

JavaScript classes with constructor and method chaining

Convert objects to arrays using Object.keys, Object.values, and Object.entries

JavaScript Set operations: union, intersection, difference, and duplicates removal

Learn how to create objects using constructor functions and understand the differences between constructor functions and ES6 classes.

Learn how to execute promises sequentially, ensuring each promise completes before the next one starts. Essential for handling dependent async operations.

Master Promise chains, .finally() behavior, Promise constructor rules, and value passing through complex scenarios.

Learn how to create triangles using CSS borders without images or SVG. Master the technique of using transparent borders to create different triangle directions.

Master the `this` keyword in JavaScript - understand all cases from common to rare, including arrow functions. A frequently asked Meta interview question.

Master JavaScript closures - understand lexical scoping, closure creation, and practical applications. Essential for React hooks and functional programming.

Simple guide to var, let, and const differences with clear legal/illegal examples. Master scope, hoisting, and redeclaration rules.

Master the difference between == (loose equality) and === (strict equality) in JavaScript. Understand type coercion, comparison rules, and best practices.