Run results for: Map vs For Loop

Run details:

User agent: Mozilla/5.0 (Linux; Android 7.1.2; GT-I9505 Build/NJH47F) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/60.0.3112.107 Mobile Safari/537.36

Browser: Chrome Mobile 60

Operating system: Android 7.1.2

Device Platform: Samsung GT-I9505

Date tested: 6 years ago

Test name	Executions per second
Map	0.3 Ops/sec
For Loop	0.9 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;