Array.prototype.indexOf () - JavaScript | MDN
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.
JavaScript Array indexOf () Method - W3Schools
Description The indexOf() method returns the first index (position) of a specified value. The indexOf() method returns -1 if the value is not found. The indexOf() method starts at a …
Check For The Presence of an Element With indexOf ()
indexOf() can be incredibly useful for quickly checking for the presence of an element on an array. We have defined a function, quickCheck, that takes an array and an element as arguments. …
How to Use indexOf () in JavaScript - DEV Community
Jul 8, 2025 · Learn how to use indexOf() in JavaScript with syntax, examples, best practices, and comparisons with includes(). Perfect for beginners.
How to use JavaScript indexOf () Method? [SOLVED] - GoLinuxCloud
Dec 19, 2022 · The indexOf method is a widely used tool in JavaScript for finding the position of a specified value within an array or a string.
indexOf · WebPlatform Docs
indexOf Summary Returns the index of the first occurrence of a value in an array. Syntax indexOf( searchElement [, fromIndex ]) searchElement Required. The value to locate in array1. …
JavaScript indexOf - finding elements in JS - ZetCode
Apr 4, 2025 · JavaScript indexOf tutorial shows how to find elements in JavaScript arrays and strings. The tutorial provides numerous examples to demonstrate element searching in JS.
JavaScript Array indexOf () - Programiz
In this tutorial, we will learn about the JavaScript Array indexOf () method with the help of examples. In this article, you will learn about the indexOf () method of Array with the help of …
Array.prototype.indexOf () - MDN Web Docs
The indexOf() method returns the first index at which a given element can be found in the array, or -1 if it is not present.
JavaScript Array indexOf () Method - GeeksforGeeks
Sep 27, 2024 · The indexOf () method in JavaScript is used to find the position of the first occurrence of a specific value in an array. If the value is not present, it returns -1. This method …