Run results for: twoja stara4

Run details:

User agent: Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/79.0.3945.130 Safari/537.36

Browser: Chrome 79

Operating system: Linux

Device Platform: Desktop

Date tested: 4 years ago

Test name	Executions per second
reduce	3524.5 Ops/sec
filter + map	9592.1 Ops/sec

Script Preparation code:

var arr = [];

var createItem = function(group, value) {
  return {
    group: group,
    value: value
  }
}
const I = 12345
for (var i = 0; i < I; i++) {
  arr[i] = createItem('nosections', i);
}
arr[0] = createItem('sections', 0);

Tests:

reduce
arr.reduce((acc, filter) => { if (filter.group === 'sections') acc.push(filter.value); return acc; }, []);
filter + map
arr.filter(_ => _.group === 'sections') .map(_ => _.value);

Run results for: twoja stara4

reduce

filter + map