Run results for: flatMap vs reduce filtering performance

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/135.0.0.0 Safari/537.36

Browser: Chrome 135

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

reduce with push

14K/s

flatMap

5K/s

View exact numbers

Test name	Executions per second
✓ reduce with push	14,433 Ops/sec
flatMap	4,887 Ops/sec

Script Preparation code:

var arr = Array.from({length:10000}, (v, i) => ({name: i, assigned: Math.random() < 0.5}));

Tests: