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Run results for:
Map has vs array some in loop
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<iframe src="https://measurethat.net/Embed?id=604068" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/136.0.0.0 Safari/537.36
Browser:
Chrome 136
Operating system:
Linux
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
Array some
5902883.5 Ops/sec
Map has
2621569.0 Ops/sec
Tests:
Array some
const referenceArray = [ {id:1},{id:2},{id:3},{id:4},{id:5},{id:6},{id:7},{id:8},{id:9},{id:0} ]; const inputArray = [ {id:5},{id:1},{id:10},{id:9},{id:5},{id:2},{id:17},{id:0},{id:4},{id:0} ]; inputArray.map(inp => ({...inp, isExisting: referenceArray.some(refA => refA.id === inp.id)}));
Map has
const referenceArray = [ {id:1},{id:2},{id:3},{id:4},{id:5},{id:6},{id:7},{id:8},{id:9},{id:0} ]; const inputArray = [ {id:5},{id:1},{id:10},{id:9},{id:5},{id:2},{id:17},{id:0},{id:4},{id:0} ]; const x = referenceArray.reduce((mapI, inp) => mapI.set(inp.id,inp), new Map()); inputArray.map(inp => ({...inp, isExisting: x.has(inp.id)}));