Run results for: Array loop vs foreach vs map with id compare in objects renan

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_4) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/13.1.1 Safari/605.1.15

Browser: Safari 13

Operating system: Mac OS X 10.15.4

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
foreach	4137.0 Ops/sec
for	2728.0 Ops/sec
map	3722.7 Ops/sec

Script Preparation code:

var idToGet = ''	

function uuidv4() {
  return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
    var r = Math.random() * 16 | 0, v = c == 'x' ? r : (r & 0x3 | 0x8);
    return v.toString(16);
  });
}

var arr = [];
    for (var i = 0; i < 1000; i++) {
      arr[i] = {id: uuidv4(), idx: i};
    }

	var item = arr[Math.floor(Math.random() * arr.length)];
	
	idToGet = item.id
  
    function someFn(i) {
      return i.id === idToGet
    }

Tests:

foreach
arr.forEach(function (item){ someFn(item); })
for
for (var i = 0, len = arr.length; i < len; i++) { someFn(arr[i]); }
map
arr.map(item => someFn(item))