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Run results for:
Reduce: concat vs push vs flatMap
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Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/140.0.0.0 Safari/537.36
Browser:
Chrome 140
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
6 months ago
Test name
Executions per second
Reduce + push
167253.2 Ops/sec
Reduce + concat
15390.4 Ops/sec
Flatmap
145813.0 Ops/sec
Script Preparation code:
a = new Array(1000).fill(0).map(() => ({ value: Math.random(), keep: Math.random() > 0.5 }));
Tests:
Reduce + push
a.reduce((acc, { value, keep }) => { if (keep) { acc.push(value); } return acc; }, []);
Reduce + concat
a.reduce((acc, { value, keep }) => (keep ? acc.concat([value]) : acc), []);
Flatmap
a.flatMap((acc, { value, keep }) => (keep ? [value] : []), []);