Run results for: Map vs For Loop

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3528.4 Safari/537.36

Browser: Chrome 70

Operating system: Mac OS X 10.13.1

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Map	4.4 Ops/sec
For Loop	4.5 Ops/sec

Script Preparation code:

var a = [];
for (var i = 0; i < 1e6; i++) {
  a[i] = Math.random();
}

Tests:

Map
var b = a.map(n => n * 2); return b;
For Loop
var b = []; for (var i = 0; i < a.length; i++) { b[i] = a[i] * 2; } return b;