Run results for: For Loop vs While Loop vs indexOf

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:109.0) Gecko/20100101 Firefox/114.0

Browser: Firefox 114

Operating system: Linux

Device Platform: Desktop

Date tested: 2 years ago

For Loop for item towards beginning

232.2M/s

While Loop for item towards beginning

229.7M/s

indexOf for item towards beginning

62.9M/s

indexOf for item towards end

35.7M/s

While Loop for item towards end

34.6M/s

For Loop for item towards end

28.2M/s

View exact numbers

Test name	Executions per second
✓ For Loop for item towards beginning	232,167,776 Ops/sec
While Loop for item towards beginning	229,741,248 Ops/sec
indexOf for item towards beginning	62,903,476 Ops/sec
indexOf for item towards end	35,721,884 Ops/sec
While Loop for item towards end	34,626,216 Ops/sec
For Loop for item towards end	28,182,848 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);
}

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')