flatMap() vs filter().map()
flatMap vs filter map
Date tested:
3 years ago
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.93 Safari/537.36
Test name
Executions per second
filter().map()
101.6 Ops/sec
flatMap()
23.5 Ops/sec
Benchmark definition (click to collapse):
Script Preparation code:
var arr = []; var i = 0; while (i <= 1E5) arr[i] = i++;
Tests:
filter().map()
arr.filter(x => x % 3).map(x => x/100)
flatMap()
arr.flatMap(x => x % 3 ? x/100 : [])
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