Run results for: Map vs Foreach mutate array

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/84.0.4147.89 Safari/537.36

Browser: Chrome 84

Operating system: Windows

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
Map	7.9 Ops/sec
Foreach	4.6 Ops/sec

Script Preparation code:

var largeArray = Array(1000000).fill('x');

Tests:

Map
largeArray = largeArray.map( (value) => { return value+'y';});
Foreach
largeArray.forEach((value, index) => { largeArray[index] = value +'y'; });