Run results for: filtering array with push vs reduce

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/115.0

Browser: Firefox 115

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

filter with push

174K/s

filter with reduce

1K/s

View exact numbers

Test name	Executions per second
✓ filter with push	174,374 Ops/sec
filter with reduce	1,017 Ops/sec

Script Preparation code:


var arr = new Array(1000);
for (let i = 0; i < 1000; ++i) {
   arr[i] = i % 2 === 0 ? true : null;
}

Tests:

filter with push
const result = []; for (const item of arr) { if (item != null) { result.push(item); } } return result;
filter with reduce
return arr.reduce( (arr, item) => (item != null ? [...arr, item] : arr), [], );