Run results for: For Loop vs While Loop vs indexOf

Run details:

User agent: Mozilla/5.0 (Android 10; Mobile; rv:134.0) Gecko/134.0 Firefox/134.0

Browser: Firefox Mobile 134

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

For Loop for item towards beginning

55.8M/s

While Loop for item towards beginning

36.7M/s

While Loop for item towards end

10.9M/s

indexOf for item towards beginning

9.0M/s

For Loop for item towards end

8.4M/s

indexOf for item towards end

6.3M/s

View exact numbers

Test name	Executions per second
✓ For Loop for item towards beginning	55,774,356 Ops/sec
While Loop for item towards beginning	36,738,660 Ops/sec
While Loop for item towards end	10,853,500 Ops/sec
indexOf for item towards beginning	9,036,146 Ops/sec
For Loop for item towards end	8,354,090 Ops/sec
indexOf for item towards end	6,339,628 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')