Remove Element - JS Live Coding Interview Challenge + Tips

Published: 02 December 2025
on channel: CodeCrack interviews

Crack the Remove Element challenge in JavaScript with two clean, in-place patterns. We start with a write-pointer solution that preserves order, then level up to a swap-from-end approach that minimizes writes (order can change). You’ll see real examples, line-by-line narration, console logs, and a quick complexity recap (O(n) time, O(1) space) plus interview tips and pitfalls to avoid.

What you’ll learn:
• Problem rephrased in plain English
• Write-pointer (stable keep) vs swap-from-end (fewer writes)
• How to return k and validate the first k elements
• Common gotchas (don’t advance after swap, don’t read beyond k)

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Timestamps:
00:00 What is the “Remove Element” challenge?
00:20 How do we restate the task in plain English and set examples?
00:52 Beginner solution: can a write-pointer remove in-place and keep order?
01:50 What do our examples return (k) and how do we validate the first k?
03:01 Optimized solution: can swap-from-end minimize writes when order can change?
04:40 What are time/space, common pitfalls, and the quick interview checklist?

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