Run results for: Filter out null and map nested object with flatMap() 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

map().filter()

17/s

filter().map()

15/s

flatMap()

12/s

View exact numbers

Script Preparation code:

var arr = [];
var id = 0;

while (id <= 1_000_000) {
  id++;
  arr[id] = id % 10 === 0
    ? { id, data: null }
    : { id, data: { id } };
}

Tests: