Run results for: For Loop vs While Loop vs indexOf

Run details:

User agent: Mozilla/5.0 (Linux; Android 8.0.0; G8441) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/105.0.0.0 Mobile Safari/537.36

Browser: Chrome Mobile 105

Operating system: Android 8.0.0

Device Platform: Mobile

Date tested: 2 years ago

Test name	Executions per second
For Loop for item towards beginning	2094818.6 Ops/sec
While Loop for item towards beginning	2085722.4 Ops/sec
indexOf for item towards beginning	2158202.2 Ops/sec
For Loop for item towards end	1766526.8 Ops/sec
While Loop for item towards end	1748309.1 Ops/sec
indexOf for item towards end	2163391.8 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')

Run results for: For Loop vs While Loop vs indexOf

For Loop for item towards beginning

While Loop for item towards beginning

indexOf for item towards beginning

For Loop for item towards end

While Loop for item towards end

indexOf for item towards end