Run results for: JavaScript spread operator vs Object.assign performance (bigger objects)

Run details:

User agent: Mozilla/5.0 (X11; Ubuntu; Linux x86_64; rv:142.0) Gecko/20100101 Firefox/142.0

Browser: Firefox 142

Operating system: Ubuntu

Device Platform: Desktop

Date tested: 11 months ago

Test name	Executions per second
✓ Using Object.assign	1,669,267 Ops/sec
Using the spread operator	557,604 Ops/sec

Tests:

Using the spread operator
const firstObject = { name: 'Alice', age: 25, contact: { email: 'alice@example.com', phone: '123-456-7890', }, preferences: { language: 'English', timezone: 'UTC', }, }; const secondObject = { job: 'Software Engineer', skills: ['JavaScript', 'React', 'Node.js'], contact: { email: 'alice.work@example.com', }, preferences: { theme: 'dark mode', }, }; const finalObject = { ...firstObject, ...secondObject };
Using Object.assign
const firstObject = { name: 'Alice', age: 25, contact: { email: 'alice@example.com', phone: '123-456-7890', }, preferences: { language: 'English', timezone: 'UTC', }, }; const secondObject = { job: 'Software Engineer', skills: ['JavaScript', 'React', 'Node.js'], contact: { email: 'alice.work@example.com', }, preferences: { theme: 'dark mode', }, }; const finalObject = Object.assign(firstObject, secondObject);