Run results for: Map vs For Loop

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36

Browser: Chrome 68

Operating system: Windows

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Map	2.8 Ops/sec
For Loop	2.9 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;