3 Must Know JavaScript Coding Challenges for QA/SDET Interviews
Hi, Engineers! 🚀
Prepare for your next QA/SDET JavaScript coding interview with these 3 must-know problems that appear very frequently in live coding rounds!
In this video we solve:
✅ Longest Common Prefix (string array)
✅ Length of Last Word
✅ Merge Two Sorted Arrays
Every single challenge is solved TWICE:
1️⃣ First with a clean, beginner-friendly approach (perfect if you're just starting out or want to understand the logic step-by-step)
2️⃣ Then with a more optimized, interview-ready solution (time & space complexity explained)
You’ll get:
• Clear problem explanations
• Visual walkthroughs of the logic
• Full JavaScript code for both approaches
• Time & space complexity analysis
• Pro tips to avoid common mistakes interviewers watch for
Whether you're a beginner building confidence or an intermediate engineer looking to polish your solutions — this video has you covered.
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Timestamps:
0:00 Intro & why these problems matter
0:37 Longest Common Prefix – Beginner Solution
3:42 Longest Common Prefix – Optimized
5:59 Length of Last Word – Beginner
7:49 Length of Last Word – Optimized
9:25 Merge Sorted Arrays – Beginner Approach
12:41 Merge Sorted Arrays – Optimal (Two Pointers)
15:57 Final tips & next steps
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