Run results for: filter + map vs conditional + foreach

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/77.0.3865.120 Safari/537.36

Browser: Chrome 77

Operating system: Mac OS X 10.15.1

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
filter + map	169939.8 Ops/sec
conditional + forEach	263101.0 Ops/sec

Script Preparation code:

var arr = Array.from(new Array(999)).map((d,i) => i);

Tests:

filter + map
var result = arr.filter(d => d%2).map(d => d * 2);
conditional + forEach
var result = []; arr.forEach(d => { if (d%2) { result.push(d * 2); } });