Sep 28, 2025 · JavaScript arrays are not associative arrays and so, array elements cannot be accessed using arbitrary strings as indexes, but must be accessed using nonnegative integers …

The indexOf() method starts at a specified index and searches from left to right (from the given start postion to the end of the array). By default the search starts at the first element and ends …

Jul 23, 2025 · Here are some effective methods to find the array index with a value in JavaScript. indexOf () returns the first index of a specified value in an array, or -1 if the value is not found. …

Feb 5, 2025 · A comprehensive guide to the JavaScript Array indexOf () method, covering its syntax, usage, and practical examples for finding the index of elements within an array.

This tutorial shows you how to use the JavaScript Array indexOf () method to find the first index of the element.

indexOf () Return Value Returns the first index of the element in the array if it is present at least once. Returns -1 if the element is not found in the array. Note: indexOf() compares …

Sep 19, 2025 · Use the indexOf () method to efficiently find the position of an element in a JavaScript array and get its index.

Sep 8, 2011 · Say I've got this imageList = [100,200,300,400,500]; Which gives me [0]100 [1]200 etc. Is there any way in JavaScript to return the index with the value? I.e. I want the index for …

The JavaScript array indexOf method is a quick and reliable way to determine the position of an element in an array, especially when working with primitive types like numbers and strings.

Jul 10, 2025 · The indexOf() method of Array instances returns the first index at which a given element can be found in the array, or -1 if it is not present.