Run results for: Create object - MeasureThat.net

Run details:

User agent: Mozilla/5.0 (Windows NT 6.3; Win64; x64; rv:63.0) Gecko/20100101 Firefox/63.0

Browser: Firefox 63

Operating system: Windows 8.1

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Spread	2588042.0 Ops/sec
Object.assign (mutate)	5209418.0 Ops/sec
Object.assign (new object)	1071712.0 Ops/sec

Website performance monitoring

Script Preparation code:

var obj = {a: 'a', b: 'b'};

Tests:

Spread
const newObj = { ...obj, c: 'c'};
Object.assign (mutate)
const newObj = Object.assign(obj, { c: 'c' });
Object.assign (new object)
const newObj = Object.assign({}, obj, { c: 'c' });