Run results for: Map vs For Loop

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:70.0) Gecko/20100101 Firefox/70.0

Browser: Firefox 70

Operating system: Linux

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Map	132.8 Ops/sec
For Loop	79.0 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;