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 …

Mar 13, 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. Element to locate in the array. Zero …

Dec 29, 2011 · index = -1; if (myArray[i].hello === searchTerm) { index = i; break; or as a function: for(var i = 0, len = myArray.length; i < len; i++) { if (myArray[i][property] === searchTerm) …

Nov 18, 2024 · indexOf () returns the first index of a specified value in an array, or -1 if the value is not found. findIndex () is used for finding the index of an element based on complex …

The indexOf() method returns the first index of occurance of an array element, or -1 if it is not found. // Output: 1. The syntax of the indexOf() method is: Here, arr is an array. The indexOf() …

Feb 5, 2025 · What is the indexOf () Method? The indexOf() method in JavaScript arrays is a fundamental tool for locating the position of a specified element within an array. This method is …

To find all the indexes of an element in an array, you can use the indexOf with a do-while loop: const results = []; let index; let fromIndex = 0; do { index = scores.indexOf(20, fromIndex); if …

Feb 25, 2025 · IndexOf function is used to find out the index of an element in a String and an Array. There are two variations, one is indexOf that is used to give you the position of search …

Nov 28, 2024 · The indexOf() function in JavaScript is a straightforward but powerful tool for searching the position of elements within an array. It provides essential functionality for …

Dec 27, 2023 · Knowing how to properly find indexes is a key skill for effective coding in JavaScript. This guide will comprehensive break down all you need to know about three …