Benchmark: forEach vs filter().map()

Script Preparation code:

var arr = [];
for (var i = 0; i < 1000; i++) {
  arr[i] = { i, extra: Math.random() < 0.5 ? null : 'test' };
}

Tests:

forEach
var newArr = []; arr.forEach((x) => { if (x.extra !== null) { newArr.push({ ...x, extra: x.extra + '!' }); } });
filter.map
var newArr = arr .filter((x) => x.extra !== null) .map((x) => ({ ...x, extra: x.extra + '!' }));

Rendered benchmark preparation results:

Previous results

Test case name	Result
forEach
filter.map

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser/OS: Chrome 129 on Mac OS X 10.15.7

filter.map

117K/s

forEach

100K/s

View exact numbers

Test name	Executions per second
✓ filter.map	116,690 Ops/sec
forEach	99,548 Ops/sec

forEach vs filter().map() (version: 0)