Benchmark: Create object - MeasureThat.net

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' });

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Spread
Object.assign (mutate)
Object.assign (new object)

Fastest: N/A

Slowest: N/A

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Latest run results:

Run details: (Test run date: 5 years ago)

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

Browser/OS: Firefox 63 on Windows 8.1

View result in a separate tab

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