Run results for: Map.forEach vs Array.forEach vs Array.from(Map.values()).forEach

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/117.0.0.0 Safari/537.36

Browser: Chrome 117

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Map.prototype.forEach

3/s

Array.prototype.forEach

2/s

Array.from(Map.prototype.values()).forEach

2/s

View exact numbers

Test name	Executions per second
✓ Map.prototype.forEach	3 Ops/sec
Array.prototype.forEach	2 Ops/sec
Array.from(Map.prototype.values()).forEach	2 Ops/sec

Script Preparation code:

var mapForEach = new Map();
var arr = [];
var mapToArr = new Map();

for (let i=0; i<100000; i++) {
  mapForEach.set(i, i);
  arr.push(i);
  mapToArr.set(i, i);
}

Tests:

Map.prototype.forEach
mapForEach.forEach(console.log);
Array.prototype.forEach
arr.forEach(console.log);
Array.from(Map.prototype.values()).forEach
Array.from(mapToArr.values()).forEach(console.log);