Run results for: object.assing vs spread

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/605.1.15 (KHTML, like Gecko) Version/15.0 Safari/605.1.15

Browser: Safari 15

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 3 years ago

Test name	Executions per second
spread	3007966.8 Ops/sec
object.assign	2159006.5 Ops/sec

Script Preparation code:

var xs = {};
for (let i = 0; i < 1000000; i++) {
  xs[`h${i}`] = `h${i}`;
}

Tests: