Run results for: find index in array performance

Run details:

User agent: Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/81.0.4044.129 Safari/537.36

Browser: Chrome 81

Operating system: Windows 7

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
indexOf	426113.5 Ops/sec
for	242644.5 Ops/sec
for of	228599.3 Ops/sec

Script Preparation code:

var numbers = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30];
var letters = ['a','b','c','d','e','f','g','h','i','j','k','l','m', 'n','o','p','q','r','s','t','u','v','w','x','y','z'];
var mixed = [ 1, 'b', 3, 'd', 5, 'f', 7, 'h', 9, 'j', 11, 'l', 13, 'n', 15, 'p', 17, 'r', 19, 't', 21, 'v', 23, 'x', 25, 'z' ];

function indexByIndexOf (array, value) {
  return array.indexOf(value)
}

function indexByFor (array, value) {
  for (var i=0; i < array.length; i++) {
    if(array[i] ===  value) {
      return i;
    }
  }
}

function indexByForOf (array, value) {
  var i = 0;
  for (var currVal of array) {
    i++;
    if(currVal ===  value) {
      return i;
    }
  }
}

Tests:

indexOf
var numberindex = indexByIndexOf(numbers, 27); var letterindex = indexByIndexOf(letters, 'x'); var mixedIndex = indexByIndexOf(mixed, 'x');
for
var numberindex = indexByFor(numbers, 27); var letterindex = indexByFor(letters, 'x'); var mixedIndex = indexByFor(letters, 'x');
for of
var numberindex = indexByForOf(numbers, 27); var letterindex = indexByForOf(letters, 'x'); var mixedIndex = indexByForOf(letters, 'x');

Run results for: find index in array performance

for of, for, indexOf

indexOf

for

for of