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/133.0.0.0 Safari/537.36

Browser: Chrome 133

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

104.2M/s

While Loop for item towards beginning

104.1M/s

indexOf for item towards beginning

99.5M/s

includes for item towards start

97.6M/s

includes for item towards end

41.0M/s

For Loop for item towards end

39.9M/s

indexOf for item towards end

39.5M/s

While Loop for item towards end

14.7M/s

View exact numbers

Test name	Executions per second
✓ For Loop for item towards beginning	104,173,344 Ops/sec
While Loop for item towards beginning	104,141,584 Ops/sec
indexOf for item towards beginning	99,487,480 Ops/sec
includes for item towards start	97,550,816 Ops/sec
includes for item towards end	41,004,212 Ops/sec
For Loop for item towards end	39,906,376 Ops/sec
indexOf for item towards end	39,496,004 Ops/sec
While Loop for item towards end	14,680,993 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')