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/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

indexOf for item towards beginning

16.6M/s

indexOf for item towards end

16.6M/s

includes for item towards end

16.5M/s

includes for item towards start

16.4M/s

For Loop for item towards beginning

15.4M/s

While Loop for item towards beginning

15.4M/s

While Loop for item towards end

11.8M/s

For Loop for item towards end

11.8M/s

View exact numbers

Test name	Executions per second
✓ indexOf for item towards beginning	16,594,587 Ops/sec
indexOf for item towards end	16,563,162 Ops/sec
includes for item towards end	16,454,580 Ops/sec
includes for item towards start	16,389,273 Ops/sec
For Loop for item towards beginning	15,407,572 Ops/sec
While Loop for item towards beginning	15,401,786 Ops/sec
While Loop for item towards end	11,782,788 Ops/sec
For Loop for item towards end	11,768,723 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')