Run results for: For Loop vs While Loop vs indexOf vs includes

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:134.0) Gecko/20100101 Firefox/134.0

Browser: Firefox 134

Operating system: Mac OS X 10.15

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

For Loop for item towards beginning

124.5M/s

While Loop for item towards beginning

124.3M/s

indexOf for item towards beginning

46.3M/s

includes for item towards start

38.9M/s

indexOf for item towards end

27.5M/s

While Loop for item towards end

22.9M/s

For Loop for item towards end

22.7M/s

includes for item towards end

21.0M/s

View exact numbers

Test name	Executions per second
✓ For Loop for item towards beginning	124,451,944 Ops/sec
While Loop for item towards beginning	124,321,152 Ops/sec
indexOf for item towards beginning	46,293,908 Ops/sec
includes for item towards start	38,896,828 Ops/sec
indexOf for item towards end	27,474,948 Ops/sec
While Loop for item towards end	22,892,338 Ops/sec
For Loop for item towards end	22,672,428 Ops/sec
includes for item towards end	20,980,202 Ops/sec

Script Preparation code:

var arr = ['apple', 'banana', 'cherry', 'donuts', 'eggplant', 'french fries', 'goulash', 'hamburger', 'ice cream', 'juice', 'kebab', 'lemonade', 'mango', 'nuts', 'octopus', 'parsley', 'quail egg', 'risotto', 'stew', 'tapas', 'udon', 'vanilla', 'wheat', 'xylotil', 'yogurt', 'zucchinni'];

function forLoop(array, item) {
	for (var i = 0; i < array.length; i++) {
    	if (array[i] === item) {
          return i;
        }
    }
    return -1;
}

function whileLoop(array, item) {
  	var i = 0;
	while (i < array.length) {
    	if (array[i] === item) {
        	return i;
        }
      	i += 1;
    }
    return -1;
}

function indexOfNative(array, item) {
	return array.indexOf(item);
}

function includesNative(array, item) {
    return array.includes(item);
}

Tests:

For Loop for item towards beginning
forLoop(arr, 'donuts')
While Loop for item towards beginning
whileLoop(arr, 'donuts')
indexOf for item towards beginning
indexOfNative(arr, 'donuts')
For Loop for item towards end
forLoop(arr, 'yogurt')
While Loop for item towards end
whileLoop(arr, 'yogurt')
indexOf for item towards end
indexOfNative(arr, 'yogurt')
includes for item towards start
includesNative(arr, 'donuts')
includes for item towards end
includesNative(arr, 'yogurt')