Run results for: .map vs .forEach

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.90 Safari/537.36

Browser: Chrome 75

Operating system: Linux

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
.map	3465415.2 Ops/sec
.forEach	10972344.0 Ops/sec

Script Preparation code:

var array = [];
array.forEach(i => array.push(i));

var someFunction = num => num * 2 * 3;

​x
 
var array = [];array.forEach(i => array.push(i));​var someFunction = num => num * 2 * 3;

Tests:

const arr1 = array.map(i => someFunction(i));

 
const arr1 = array.map(i => someFunction(i));

.forEach
const arr2 = []; array.forEach(i => { arr2.push(someFunction(i)); });
const arr2 = [];
array.forEach(i => { arr2.push(someFunction(i)); });