Web Reference: Jul 20, 2025 · The findIndex () method of Array instances returns the index of the first element in an array that satisfies the provided testing function. If no elements satisfy the testing function, -1 is returned. The findIndex() method executes a function for each array element. The findIndex() method returns the index (position) of the first element that passes a test. The findIndex() method returns -1 if no match is found. The findIndex() method does not execute the function for empty array elements. Aug 27, 2021 · In this post find out about how to get the index in a forEach loop in JavaScript along with examples, arrow functions and more.
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