Run results for: For Loop vs While Loop vs indexOf vs includes

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:121.0) Gecko/20100101 Firefox/121.0

Browser: Firefox 121

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

While Loop for item towards beginning

120.9M/s

For Loop for item towards beginning

118.4M/s

indexOf for item towards beginning

49.0M/s

includes for item towards start

41.0M/s

indexOf for item towards end

27.3M/s

For Loop for item towards end

23.5M/s

While Loop for item towards end

23.3M/s

includes for item towards end

22.5M/s

View exact numbers

Test name	Executions per second
✓ While Loop for item towards beginning	120,872,184 Ops/sec
For Loop for item towards beginning	118,353,728 Ops/sec
indexOf for item towards beginning	48,992,160 Ops/sec
includes for item towards start	41,040,672 Ops/sec
indexOf for item towards end	27,333,014 Ops/sec
For Loop for item towards end	23,510,918 Ops/sec
While Loop for item towards end	23,333,058 Ops/sec
includes for item towards end	22,468,280 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')