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

Run details:

User agent: Mozilla/5.0 (Android 14; Mobile; rv:131.0) Gecko/131.0 Firefox/131.0

Browser: Firefox Mobile 131

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Benchmark engine: Benchmark.js

For Loop for item towards beginning

108.5M/s

While Loop for item towards beginning

106.4M/s

indexOf for item towards beginning

27.9M/s

includes for item towards start

24.3M/s

While Loop for item towards end

17.1M/s

For Loop for item towards end

15.8M/s

indexOf for item towards end

15.3M/s

includes for item towards end

14.1M/s

View exact numbers

Test name	Executions per second
✓ For Loop for item towards beginning	108,451,768 Ops/sec
While Loop for item towards beginning	106,385,936 Ops/sec
indexOf for item towards beginning	27,949,540 Ops/sec
includes for item towards start	24,302,244 Ops/sec
While Loop for item towards end	17,068,624 Ops/sec
For Loop for item towards end	15,778,226 Ops/sec
indexOf for item towards end	15,317,854 Ops/sec
includes for item towards end	14,102,850 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')