JavaScript is one of the most important programming languages for technical interviews, especially for front-end and full-stack roles. Mastering JavaScript interview questions helps you:
✅ Demonstrate problem-solving skills and algorithmic thinking
✅ Showcase deep knowledge of JavaScript fundamentals and advanced concepts
✅ Improve your ability to write clean, optimized, and efficient code
✅ Boost confidence in handling real-world coding challenges
Below are 30+ JavaScript questions that frequently appear in interviews. Understanding and solving them will enhance your coding skills and improve your chances of landing your dream job.
JavaScript Interview Questions You Must Master
Core JavaScript Concepts
💡 Create a Curried Multiplication Function
💡 Group Elements by Callback
💡 Merge Identical API Calls
💡 Custom Polyfill for document.getElementById
💡 Store and Return Message
💡 Memoization for Expensive Calculations
💡 Last Card Loser
💡 Create a Count Function
💡 Two-Way Data Binding with Model
💡 Flatten Array of Objects
Advanced JavaScript Techniques
💡 Distribute Task Units
💡 Throttle API Requests with Promises
💡 Implement _.chunk()
💡 Convert Hours to Minutes
💡 Bind state.value to an HTMLInputElement
💡 Polyfill for Promise.all
💡 Implement LocalStorage with Expiry
💡 Auto-Retry Promise on Rejection
💡 Counting Layers in a Grid
Data Structures & Algorithms
💡 Implement Array.prototype.reduce()
💡 Count Number of Parameters
💡 Intersection of Two Sorted Arrays
💡 Create an Incrementing Score Tracker
💡 Multiply Using Anonymous Functions
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Top comments (1)
Awesome collection of JavaScript questions! These are definitely a must-know for anyone preparing for interviews.