Loops in JavaScript
From the JavaScript cheat sheet · Control Flow · verified Jul 2026
Loops
for, while, do-while, for...of, for...in, break, and continue
javascript
for (let i = 0; i < 5; i++) { }
while (condition) { }
for (const item of array) { } // iterate values
for (const key in object) { } // iterate keys💡 for...of iterates VALUES (arrays, strings, Maps, Sets) — use for most loops
⚡ for...in iterates KEYS/properties (objects) — avoid on arrays, use for...of instead
📌 break exits the loop entirely; continue skips to the next iteration
🟢 for...of works on any iterable — arrays, strings, Maps, Sets, generators