Run results for: reduce vs flatMap, conditional

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/110.0.0.0 Safari/537.36

Browser: Chrome 110

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

reduce

18.4M/s

flatMap

2.6M/s

View exact numbers

Test name	Executions per second
✓ reduce	18,423,534 Ops/sec
flatMap	2,579,714 Ops/sec

Script Preparation code:

var xs = [{
    text: "a",
    sort: false
}, {
    text: "b",
    sort: true
}, {
    text: "c",
    sort: false
}, {
    text: "d",
    sort: true
}, {
    text: "e",
    sort: false
}]

Tests:

reduce
xs.reduce((acc, x) => { if (x.sort) { acc.push(x.text); } return acc; }, ["z"])
flatMap
xs.flatMap((x) => x.sort ? [x.text] : []);