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Run results for:
Transform: Object.fromEntries vs reduce (100 entries)
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<iframe src="https://measurethat.net/Embed?id=487797" width="100%" height="500px"></iframe>
Run details:
User agent:
Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/119.0.0.0 Safari/537.36
Browser:
Chrome 119
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
2 years ago
Test name
Executions per second
Object.fromEntries (with transform data)
128819.0 Ops/sec
Reduce (reuse object)
255586.0 Ops/sec
Reduce (creating temporary objects)
106912.0 Ops/sec
Script Preparation code:
var ENTRIES = 100; 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 }; }, {} );