[JavaScript] How to find the index of given element in an array?

indexOf() array method is used to find the index of a given element in Javascript

Syntax

Array.indexOf(searchElement, fromIndex)

Example

let str = 'Hello World';

console.log(str.indexOf('r')); // Outputs 8

console.log(str.indexOf('k')); //Outputs -1 as k is not present in the given string

Run the above example online here: https://onecompiler.com/javascript/3xn76e29z