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/129.0.0.0 Safari/537.36

Browser: Chrome 129

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

includes for item towards start

4.3M/s

includes for item towards end

3.9M/s

indexOf for item towards beginning

3.8M/s

For Loop for item towards beginning

3.6M/s

While Loop for item towards end

3.6M/s

While Loop for item towards beginning

3.4M/s

indexOf for item towards end

3.3M/s

For Loop for item towards end

3.3M/s

View exact numbers

Test name	Executions per second
✓ includes for item towards start	4,268,155 Ops/sec
includes for item towards end	3,859,455 Ops/sec
indexOf for item towards beginning	3,769,221 Ops/sec
For Loop for item towards beginning	3,621,502 Ops/sec
While Loop for item towards end	3,593,186 Ops/sec
While Loop for item towards beginning	3,445,468 Ops/sec
indexOf for item towards end	3,336,169 Ops/sec
For Loop for item towards end	3,325,799 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')