Benchmark: filtermap vs flatmap

Tests:

filtermap
const arr = Array.from(new Array(10000), (_, i) => i) const result = arr.filter(n => n % 2 === 0).map(n => n / 2)
flatmap
const arr = Array.from(new Array(10000), (_, i) => i) const result = arr.flatMap(n => n % 2 === 0 ? [n / 2] : [])
proc
const arr = Array.from(new Array(10000), (_, i) => i) const result = [] for (const i of arr) { if (i % 2 === 0) result.push(i/2) }

Rendered benchmark preparation results:

Previous results

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Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/86.0.4240.198 Safari/537.36

Browser/OS: Chrome 86 on Windows

filtermap vs flatmap (version: 0)