Run results for: concat vs spread with random array elements

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/94.0.4606.81 Safari/537.36

Browser: Chrome 94

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
concat	714427.8 Ops/sec
spread	719735.4 Ops/sec

Tests:

concat

const a1 = new Array(5).fill(undefined).map(a => Math.random() * 100);
const a2 = new Array(5).fill(undefined).map(a => Math.random() * 100);
const a3 = a1.concat(a2)

AخA
 
const a1 = new Array(5).fill(undefined).map(a => Math.random() * 100);const a2 = new Array(5).fill(undefined).map(a => Math.random() * 100);const a3 = a1.concat(a2)

spread

const a1 = new Array(5).fill(undefined).map(a => Math.random() * 100);
const a2 = new Array(5).fill(undefined).map(a => Math.random() * 100);
const a3 = [...a1,...a2]

 
const a1 = new Array(5).fill(undefined).map(a => Math.random() * 100);const a2 = new Array(5).fill(undefined).map(a => Math.random() * 100);const a3 = [...a1,...a2]