How to Move All Zeros to End of Array in JavaScript

🚀 Welcome to another episode of the JavaScript Interview Questions series for 2026! In this video, we solve a highly popular array manipulation problem frequently asked in coding interviews at top tech companies: "Move All Zeros to the End of an Array."

We'll cover:
✅ The problem statement and understanding the core logic.
✅ A naive/brute force approach to solving it.
✅ An optimized, efficient approach (Two-Pointer Technique) with O(n) time complexity and O(1) space complexity.
✅ Line-by-line code walkthrough in JavaScript.

💡 Problem Statement:
Given an array of integers, move all the 0's to the end of it while maintaining the relative order of the non-zero elements. Make sure you do this in-place without making a copy of the array!

Example:
Input: [0, 1, 0, 3, 12]
Output: [1, 3, 12, 0, 0]

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Видео How to Move All Zeros to End of Array in JavaScript канала Atesh Tech