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/135.0.0.0 Safari/537.36 Edg/135.0.0.0

Browser: Chrome 135

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

While Loop for item towards beginning

113.8M/s

For Loop for item towards beginning

103.3M/s

indexOf for item towards beginning

83.6M/s

includes for item towards start

82.3M/s

For Loop for item towards end

47.7M/s

While Loop for item towards end

45.0M/s

includes for item towards end

37.5M/s

indexOf for item towards end

36.2M/s

View exact numbers

Test name	Executions per second
✓ While Loop for item towards beginning	113,800,144 Ops/sec
For Loop for item towards beginning	103,348,544 Ops/sec
indexOf for item towards beginning	83,591,016 Ops/sec
includes for item towards start	82,337,216 Ops/sec
For Loop for item towards end	47,705,156 Ops/sec
While Loop for item towards end	45,000,556 Ops/sec
includes for item towards end	37,468,276 Ops/sec
indexOf for item towards end	36,180,668 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')