display an array of items with an index javascript code example

Example 1: how to get the index of an array in javascript

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

Example 2: make indexOF in js

function indexOf(arr, value) {
  for (let [i, e] of arr.entries()) {
    if (value == e) return i;
  }
  return -1;
}
indexOf([1,2,3], 2);                     //returns 1