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; rv:131.0) Gecko/20100101 Firefox/131.0

Browser: Firefox 131

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

For Loop for item towards beginning

316.4M/s

While Loop for item towards beginning

314.4M/s

indexOf for item towards beginning

102.6M/s

includes for item towards start

93.3M/s

includes for item towards end

50.8M/s

indexOf for item towards end

46.9M/s

For Loop for item towards end

32.2M/s

While Loop for item towards end

31.5M/s

View exact numbers

Test name	Executions per second
✓ For Loop for item towards beginning	316,366,112 Ops/sec
While Loop for item towards beginning	314,362,784 Ops/sec
indexOf for item towards beginning	102,592,512 Ops/sec
includes for item towards start	93,323,480 Ops/sec
includes for item towards end	50,754,884 Ops/sec
indexOf for item towards end	46,944,548 Ops/sec
For Loop for item towards end	32,239,878 Ops/sec
While Loop for item towards end	31,476,410 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')