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Run results for:
Reduce Object.assign vs spread
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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/143.0.0.0 Safari/537.36
Browser:
Chrome 143
Operating system:
Mac OS X 10.15.7
Device Platform:
Desktop
Date tested:
6 months ago
Test name
Executions per second
Object.assign
1038034.9 Ops/sec
Map
2203351.0 Ops/sec
Spread
794676.9 Ops/sec
Script Preparation code:
const items = Array.from(Array(10).keys());
Tests:
Object.assign
const items = Array.from(Array(10).keys()); items.reduce((memo, val) => Object.assign(memo, { [`id-${val}`]: val }), {});
Map
const items = Array.from(Array(10).keys()); items.reduce((memo, val) => memo.set(`id-${val}`, val), new Map());
Spread
const items = Array.from(Array(10).keys()); items.reduce((memo, val) => ({ ...memo, [`id-${val}`]: val }), {});