Run results for: reduce vs filter+map

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/138.0.0.0 YaBrowser/25.8.0.0 Safari/537.36

Browser: Yandex Browser 25

Operating system: Linux

Device Platform: Desktop

Date tested: 8 months ago

reduce

38K/s

filter+map

26K/s

View exact numbers

Test name	Executions per second
✓ reduce	38,391 Ops/sec
filter+map	25,968 Ops/sec

Script Preparation code:

var items = [];
for (var i = 0; i < 10000; i++) {
  items[i] = {
    id: i,
    selected: i % 4 == 0
  };
}

Tests:

reduce
items.reduce( ( array, item ) => { if ( item.selected ) { array.push( item.id ); } return array; }, [] );
filter+map
items.filter( x => x.selected ).map( x => x.id );