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Run results for:
Filter out null and map nested object with flatMap() vs map().filter()
flatMap vs filter map
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<iframe src="https://measurethat.net/Embed?id=599263" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:138.0) Gecko/20100101 Firefox/138.0
Browser:
Firefox 138
Operating system:
Windows
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
map().filter()
16.7 Ops/sec
flatMap()
11.8 Ops/sec
filter().map()
15.2 Ops/sec
Script Preparation code:
var arr = []; var id = 0; while (id <= 1_000_000) { id++; arr[id] = id % 10 === 0 ? { id, data: null } : { id, data: { id } }; }
Tests:
map().filter()
arr.map(it => it.data).filter(it => it !== null)
flatMap()
arr.flatMap(it => it.data != null ? [it.data] : [])
filter().map()
arr.filter(it => it.data !== null).map(it => it.data)