Longest Common Prefix JavaScript Coding Challenge Interview Solution

Published: 08 October 2025
on channel: CodeCrack interviews

Master Longest Common Prefix in JavaScript for coding interviews. We restate the problem in plain English, build examples, code two solutions step by step (prefix trimming and vertical scan), run console checks, and cover Big-O and edge cases. Perfect for software engineer and SDET/QA prep.

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Timestamps:
0:00 — What is the Longest Common Prefix problem?
0:18 — Can we rephrase it and see quick examples?
0:40 — How does the prefix-trimming method work?
1:35 — Can we code method 1 and test it?
2:30 — What is the vertical scan optimization?
3:25 — Can we code method 2 and verify outputs?
4:40 — What are edge cases and Big-O, and when to use each?

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