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

For Loop for item towards beginning

230.0M/s

While Loop for item towards beginning

223.2M/s

indexOf for item towards beginning

59.2M/s

includes for item towards start

56.2M/s

indexOf for item towards end

37.3M/s

includes for item towards end

34.9M/s

While Loop for item towards end

34.6M/s

For Loop for item towards end

34.6M/s

View exact numbers

Test name	Executions per second
✓ For Loop for item towards beginning	229,969,200 Ops/sec
While Loop for item towards beginning	223,219,968 Ops/sec
indexOf for item towards beginning	59,157,844 Ops/sec
includes for item towards start	56,228,372 Ops/sec
indexOf for item towards end	37,339,128 Ops/sec
includes for item towards end	34,885,576 Ops/sec
While Loop for item towards end	34,647,584 Ops/sec
For Loop for item towards end	34,635,896 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')