Run results for: Map vs For Loop

Run details:

User agent: Mozilla/5.0 (Android 7.1.1; Mobile; rv:50.0) Gecko/50.0 Firefox/50.0

Browser: Firefox Mobile 50

Operating system: Android 7.1.1

Device Platform: Other

Date tested: 7 years ago

Test name	Executions per second
Map	33.7 Ops/sec
For Loop	22.1 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;