Run results for: forEach vs filter().map() vs map().filter()

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/129.0.0.0 Safari/537.36

Browser: Chrome 129

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

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