Run results for: flatMap() vs filter().map()asdsadsaasdsad

Run details:

User agent: Mozilla/5.0 (Linux; Android 12; DCO-LX9; HMSCore 6.12.2.302) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.88 HuaweiBrowser/14.0.2.311 Mobile Safari/537.36

Browser: Chrome 99

Operating system: Android

Device Platform: Mobile

Date tested: one year ago

Test name	Executions per second
filter().map()	1901760.5 Ops/sec
flatMap()	182680.8 Ops/sec
map.flat	180410.6 Ops/sec

Script Preparation code:

var arr = [];
var i = 0;

while (i <= 30) arr[i] = i++;

Tests:

filter().map()
arr.filter(x => x % 3).map(x => x/100)
flatMap()
arr.flatMap(x => x % 3 ? x/100 : [])
map.flat
arr.map(x => x % 3 ? x/100 : []).flat(1)

Run results for: flatMap() vs filter().map()asdsadsaasdsad

flatMap vs filter map

filter().map()

flatMap()

map.flat