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/122.0.0.0 Safari/537.36

Browser: Chrome 122

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

includes for item towards end

4.2M/s

indexOf for item towards end

4.2M/s

includes for item towards start

4.2M/s

indexOf for item towards beginning

4.1M/s

For Loop for item towards beginning

3.9M/s

While Loop for item towards beginning

3.8M/s

For Loop for item towards end

3.4M/s

While Loop for item towards end

3.3M/s

View exact numbers

Test name	Executions per second
✓ includes for item towards end	4,216,025 Ops/sec
indexOf for item towards end	4,199,275 Ops/sec
includes for item towards start	4,176,469 Ops/sec
indexOf for item towards beginning	4,092,794 Ops/sec
For Loop for item towards beginning	3,897,934 Ops/sec
While Loop for item towards beginning	3,829,805 Ops/sec
For Loop for item towards end	3,435,934 Ops/sec
While Loop for item towards end	3,318,448 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')