Run results for: object concat vs spread vs concat

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
concat	2647.4 Ops/sec
spread	2099.4 Ops/sec

Script Preparation code:

const getData = () => [...Array.from(Array(5000))].map(_ => ({
    a: 123,
    b: '123',
    c: [1, 2, 3]
}));

Tests:

concat
const getData = () => [...Array.from(Array(5000))].map(_ => ({ a: 123, b: '123', c: [1,2,3]})); const concatTest = () => { const a = getData(); const b = a.concat(getData()); } concatTest();
spread
const getData = () => [...Array.from(Array(5000))].map(_ => ({ a: 123, b: '123', c: [1,2,3]})); const spreadTest = () => { const a = getData(); const b = [...a, ...getData()] } spreadTest();