Web Reference: Jul 29, 2025 · The for...in loop will traverse all integer keys before traversing other keys, and in strictly increasing order, making the behavior of for...in close to normal array iteration. Do not use for in over an Array if the index order is important. The index order is engine-dependent, and array values may not be accessed in the order you expect. It is better to use a for loop, a for of loop, or Array.forEach () when the order is important. Jan 22, 2026 · The for...in loop in JavaScript is used to iterate over the enumerable properties of an object. It provides an easy way to access each key (property name) one by one.
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