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_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser: Chrome 131

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

For Loop for item towards beginning

98.5M/s

While Loop for item towards beginning

98.0M/s

includes for item towards start

87.5M/s

indexOf for item towards beginning

85.6M/s

For Loop for item towards end

40.4M/s

While Loop for item towards end

39.5M/s

includes for item towards end

37.3M/s

indexOf for item towards end

35.1M/s

View exact numbers

Test name	Executions per second
✓ For Loop for item towards beginning	98,518,328 Ops/sec
While Loop for item towards beginning	97,952,792 Ops/sec
includes for item towards start	87,541,624 Ops/sec
indexOf for item towards beginning	85,632,576 Ops/sec
For Loop for item towards end	40,364,028 Ops/sec
While Loop for item towards end	39,549,908 Ops/sec
includes for item towards end	37,315,256 Ops/sec
indexOf for item towards end	35,105,556 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')