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

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:133.0) Gecko/20100101 Firefox/133.0

Browser: Firefox 133

Operating system: Linux

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

While Loop for item towards beginning

72.1M/s

For Loop for item towards beginning

71.7M/s

indexOf for item towards beginning

30.0M/s

includes for item towards start

25.1M/s

indexOf for item towards end

16.2M/s

includes for item towards end

14.6M/s

For Loop for item towards end

12.6M/s

While Loop for item towards end

12.6M/s

View exact numbers

Test name	Executions per second
✓ While Loop for item towards beginning	72,112,056 Ops/sec
For Loop for item towards beginning	71,667,448 Ops/sec
indexOf for item towards beginning	29,995,712 Ops/sec
includes for item towards start	25,117,074 Ops/sec
indexOf for item towards end	16,152,632 Ops/sec
includes for item towards end	14,644,583 Ops/sec
For Loop for item towards end	12,597,550 Ops/sec
While Loop for item towards end	12,551,132 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')