Run results for: map vs splice test

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/130.0.0.0 Safari/537.36

Browser: Chrome 130

Operating system: Windows

Device Platform: Desktop

Date tested: one year ago

Benchmark engine: Benchmark.js

Test name	Executions per second
✓ slice	85,966 Ops/sec
map	78,248 Ops/sec

Tests:

map
const events = []; let max = 1000; while (max > 0) { events.push({ id: max, title: `t ${max}`}); max --; } const event = { id: 500, title: 'foo' }; const index = events.findIndex((el) => el.id === event.id); let updated; if (index === -1) { updated = events.map((el) => el.id === event.id ? event : el); } else { updated = [ ...events, event ]; }
slice
const events = []; let max = 1000; while (max > 0) { events.push({ id: max, title: `t ${max}`}); max --; } const event = { id: 500, title: 'foo' }; const index = events.findIndex((el) => el.id === event.id); let updated; if (index === -1) { updated = [ ...events.slice(0, index), event, ...events.slice(index + 1) ]; } else { updated = [ ...events, event ]; }