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

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser: Chrome 133

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

For Loop for item towards beginning

96.9M/s

While Loop for item towards beginning

93.9M/s

indexOf for item towards beginning

81.5M/s

includes for item towards start

70.6M/s

For Loop for item towards end

43.0M/s

While Loop for item towards end

42.3M/s

indexOf for item towards end

26.9M/s

includes for item towards end

25.8M/s

View exact numbers

Test name	Executions per second
✓ For Loop for item towards beginning	96,935,536 Ops/sec
While Loop for item towards beginning	93,905,352 Ops/sec
indexOf for item towards beginning	81,485,768 Ops/sec
includes for item towards start	70,639,880 Ops/sec
For Loop for item towards end	43,033,440 Ops/sec
While Loop for item towards end	42,260,360 Ops/sec
indexOf for item towards end	26,860,556 Ops/sec
includes for item towards end	25,826,484 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')