Run results for: JavaScript spread operator check

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/122.0.0.0 Safari/537.36

Browser: Chrome 122

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Using direct assignment

8.5M/s

Using the spread operator

6.9M/s

View exact numbers

Test name	Executions per second
✓ Using direct assignment	8,469,316 Ops/sec
Using the spread operator	6,859,494 Ops/sec

Script Preparation code:

const obj1 = { a: "a" };
const obj2 = { b: "b" };

window.obj1 = obj1;
window.obj2 = obj2;

Tests:

Using the spread operator
const finalObject = { c: "a", ...obj1, ...obj2 };
Using direct assignment
const finalObject = { c: "a" } finalObject.a = obj1.a finalObject.b = obj2.b