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

Run details:

User agent: Mozilla/5.0 (Linux; Android 10; K) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Mobile Safari/537.36 EdgA/131.0.0.0

Browser: Chrome Mobile 131

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Benchmark engine: Benchmark.js

While Loop for item towards beginning

27.6M/s

For Loop for item towards beginning

26.4M/s

includes for item towards start

25.6M/s

indexOf for item towards beginning

24.1M/s

For Loop for item towards end

11.8M/s

While Loop for item towards end

11.6M/s

includes for item towards end

10.1M/s

indexOf for item towards end

10.1M/s

View exact numbers

Test name	Executions per second
✓ While Loop for item towards beginning	27,603,452 Ops/sec
For Loop for item towards beginning	26,387,100 Ops/sec
includes for item towards start	25,621,330 Ops/sec
indexOf for item towards beginning	24,061,516 Ops/sec
For Loop for item towards end	11,786,085 Ops/sec
While Loop for item towards end	11,645,363 Ops/sec
includes for item towards end	10,126,187 Ops/sec
indexOf for item towards end	10,050,206 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')