All Loops in JavaScript, Explained

Publié le: 20 octobre 2025
sur la chaîne: CodeCrack interviews

113

Level up your JavaScript loops fast. In this lesson we break down “for”, “while”, “do…while”, “for…of”, “for…in”, and “forEach” with clear when-to-use guidance, line-by-line examples, and common pitfalls to avoid (early returns, skipping items, prototype keys, performance). Perfect for interview prep and SDET or engineering tasks—simple explanations, real code, and quick mental models so you pick the right loop every time.

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Timestamps:
0:00 — What are JavaScript loops and what will we learn today?
0:54 — How do we set up demo data: “nums”, “name”, and “user”?
1:12 — How does the “for” loop work and when should we use it?
2:02 — When is a “while” loop better for condition-based runs?
2:44 — What does “do while” guarantee and why use it?
3:24 — How do we iterate array values with “for of” cleanly?
4:00 — When should we use “forEach” and why no early break?
4:46 — How do we iterate a string with “for of” character by character?
5:15 — How do we loop object keys with “for in” safely?
6:20 — Why use “Object dot prototype dot hasOwnProperty dot call”?
6:50 — Which loops are most popular for interviews and daily work?
7:10 — What outputs should we see when we run each demo?
8:20 — How do we choose the right loop quickly under pressure?
9:26 — Wrap-up: no-code candy analogy, recap, and next steps

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