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

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser: Chrome 135

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: one year ago

map().filter()

114.4M/s

filter().map()

109.9M/s

flatMap()

53.0M/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: