Run results for: Object.assign vs spread v2

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.84 Safari/537.36

Browser: Chrome 68

Operating system: Windows

Device Platform: Desktop

Date tested: 5 years ago

Test name	Executions per second
Spread	7.4 Ops/sec
Object.assign	288.7 Ops/sec

Tests:

Spread
var obj = {} for (var i = 0; i < 1000; i++) { obj = { ...obj, [i.toString()]: i } }
Object.assign
var obj = {} for (var i = 0; i < 1000; i++) { obj = Object.assign(obj, { [i.toString()]: i }) }