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Top Architect
Top Architect
Jul 9, 2020 · Frontend Development

Comparing JavaScript Looping Methods: for, forEach, map, for...in, and for...of

This article compares the five main JavaScript iteration constructs—traditional for loops, forEach, map, for...in, and for...of—detailing their syntax, use‑cases, performance characteristics, and how to choose the most appropriate one for a given scenario.

JavaScriptLoopPerformance
0 likes · 13 min read
Comparing JavaScript Looping Methods: for, forEach, map, for...in, and for...of
Vipshop Quality Engineering
Vipshop Quality Engineering
Aug 8, 2017 · Frontend Development

Why for…in Breaks JavaScript Arrays and How for…of Fixes It

This article examines a production incident caused by using the ES5 for...in loop to iterate over arrays, explains its pitfalls such as prototype pollution and string indexes, and demonstrates why switching to the ES6 for...of construct provides safer, more predictable array traversal.

ES6JavaScriptPrototype
0 likes · 6 min read
Why for…in Breaks JavaScript Arrays and How for…of Fixes It