Run results for: reduce vs map + filter

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:138.0) Gecko/20100101 Firefox/138.0

Browser: Firefox 138

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

reduce

28K/s

map + filter

13K/s

View exact numbers

Test name	Executions per second
✓ reduce	28,185 Ops/sec
map + filter	13,061 Ops/sec

Script Preparation code:

var arr = (() => {
  const res = new Array(10000).fill({id: 0});
  res[9000] = {id: 1};
  return res;
})();

Tests:

reduce
arr.reduce((acc,x) => { if (x.id > 0) { acc.push(x.id) } return acc; },[])
map + filter
arr.map(x => x.id).filter(x => x > 0)