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.

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 specified index and …

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. Modify the …

Jul 8, 2025 · Learn how to use indexOf() in JavaScript with syntax, examples, best practices, and comparisons with includes(). Perfect for beginners.

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 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. fromIndex …

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.

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 examples.

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.

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 is handy for quickly …