Web Reference: Using for (var property in array) will cause array to be iterated over as an object, traversing the object prototype chain and ultimately performing slower than an index-based for loop. Oct 30, 2025 · The for...in statement iterates over the enumerable string properties of an object, while the for...of statement iterates over values that the iterable object defines to be iterated over. The following example shows the difference between a for...of loop and a for...in loop when used with an Array. Jul 23, 2025 · Using for...in for array iteration is generally considered a bad idea because it iterates over all enumerable properties of an object, not just the array elements.
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