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) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/123.0.0.0 Safari/537.36

Browser: Chrome 123

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

For Loop for item towards beginning

6.1M/s

While Loop for item towards beginning

5.9M/s

includes for item towards start

5.5M/s

indexOf for item towards beginning

5.1M/s

For Loop for item towards end

5.1M/s

While Loop for item towards end

4.9M/s

includes for item towards end

4.5M/s

indexOf for item towards end

4.5M/s

View exact numbers

Test name	Executions per second
✓ For Loop for item towards beginning	6,050,922 Ops/sec
While Loop for item towards beginning	5,877,854 Ops/sec
includes for item towards start	5,466,505 Ops/sec
indexOf for item towards beginning	5,148,660 Ops/sec
For Loop for item towards end	5,068,526 Ops/sec
While Loop for item towards end	4,913,269 Ops/sec
includes for item towards end	4,482,484 Ops/sec
indexOf for item towards end	4,476,346 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')