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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Browser: Chrome 122

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

includes for item towards end

9.7M/s

indexOf for item towards beginning

9.6M/s

indexOf for item towards end

9.6M/s

includes for item towards start

9.6M/s

While Loop for item towards beginning

9.0M/s

For Loop for item towards beginning

8.9M/s

While Loop for item towards end

6.9M/s

For Loop for item towards end

6.9M/s

View exact numbers

Test name	Executions per second
✓ includes for item towards end	9,683,258 Ops/sec
indexOf for item towards beginning	9,649,602 Ops/sec
indexOf for item towards end	9,637,135 Ops/sec
includes for item towards start	9,624,793 Ops/sec
While Loop for item towards beginning	8,988,876 Ops/sec
For Loop for item towards beginning	8,948,912 Ops/sec
While Loop for item towards end	6,943,510 Ops/sec
For Loop for item towards end	6,895,020 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')