Web Reference: Jul 20, 2025 · The keys () method of Array instances returns a new array iterator object that contains the keys for each index in the array. Apr 5, 2018 · Yet another method introduced in this new version of JavaScript is Array.prototype.keys(). This method returns a new Array Iterator (not an array) containing the keys of the array’s... Description prototype allows you to add new properties and methods to arrays. prototype is a property available with all JavaScript objects.
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