Run results for: JavaScript spread operator vs Object.assign vs different spread performance v2

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/126.0.0.0 Safari/537.36

Browser: Chrome 126

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
✓ Composing objects into new one	139,970,288 Ops/sec
Using the spread operator with constant inside	63,406,088 Ops/sec
Using the spread operator with two extra variables	58,530,804 Ops/sec
Using the spread operator to merge two objects	19,185,654 Ops/sec
Using Object.assign to merge two objects	8,271,973 Ops/sec

Tests:

Using the spread operator with constant inside
const firstObject = { sampleData: 'Hello world' } const secondObject = { moreData: 'foo bar' } const finalObject = { ...secondObject, __key: "a key", __src: "a src", };
Using Object.assign to merge two objects
const firstObject = { __key: "a key", __src: "a src", } const secondObject = { moreData: 'foo bar' } const finalObject = Object.assign(firstObject, secondObject);
Using the spread operator to merge two objects
const firstObject = { __key: "a key", __src: "a src", } const secondObject = { moreData: 'foo bar' } const finalObject = { ...secondObject, ...firstObject };
Using the spread operator with two extra variables
const __key = "a key"; const __src = "a src"; const secondObject = { moreData: 'foo bar' } const finalObject = { ...secondObject, __key, __src, };
Composing objects into new one
const __key = "a key"; const __src = "a src"; const data = { moreData: 'foo bar' } const finalObject = { data, __key, __src, };