how to find array index position in javascript code example

Example 1: get index of element in array javascript

var scores = [10, 20, 30, 10, 40, 20];
console.log(scores.indexOf(30)); // 2
console.log(scores.indexOf(50)); // -1

Example 2: how to get the index of an array in javascript

search = (arr, item) => { return arr.indexOf(item); }