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; rv:135.0) Gecko/20100101 Firefox/135.0

Browser: Firefox 135

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

While Loop for item towards beginning

109.8M/s

For Loop for item towards beginning

91.0M/s

includes for item towards start

32.0M/s

indexOf for item towards beginning

24.7M/s

includes for item towards end

21.7M/s

While Loop for item towards end

18.4M/s

For Loop for item towards end

18.0M/s

indexOf for item towards end

15.7M/s

View exact numbers

Test name	Executions per second
✓ While Loop for item towards beginning	109,849,968 Ops/sec
For Loop for item towards beginning	91,033,608 Ops/sec
includes for item towards start	32,008,738 Ops/sec
indexOf for item towards beginning	24,674,158 Ops/sec
includes for item towards end	21,670,140 Ops/sec
While Loop for item towards end	18,354,544 Ops/sec
For Loop for item towards end	18,004,726 Ops/sec
indexOf for item towards end	15,679,192 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')