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Run results for:
Transform: Object.fromEntries vs reduce (small dataset)
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<iframe src="https://measurethat.net/Embed?id=581747" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36
Browser:
Chrome 131
Operating system:
Linux
Device Platform:
Desktop
Date tested:
one year ago
Test name
Executions per second
Object.fromEntries (with transform data)
2076.1 Ops/sec
Reduce (reuse object)
13022.5 Ops/sec
Reduce (creating temporary objects)
96.0 Ops/sec
Script Preparation code:
var ENTRIES = 10000; var data = Array.from(Array(ENTRIES).keys()).map(key => ({id: key, someProp: key + 1})) var createObject = (value) => ({ id: value.id });
Tests:
Object.fromEntries (with transform data)
Object.fromEntries( data.map( currentObj => { const transformedObj = createObject( currentObj ); return [ transformedObj.id, transformedObj ]; }));
Reduce (reuse object)
data.reduce( ( acc, currentObj ) => { const transformedObj = createObject( currentObj ); acc[ transformedObj.id ] = transformedObj; return acc; }, {});
Reduce (creating temporary objects)
data.reduce( ( acc, currentObj ) => { const transformedObj = createObject( currentObj ); return { ...acc, [ transformedObj.id ]: transformedObj }; }, {} );