Run results for: Unerscore.keys vs object.keys

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3521.0 Safari/537.36

Browser: Chrome 70

Operating system: Mac OS X 10.13.6

Device Platform: Desktop

Date tested: 6 years ago

Test name	Executions per second
_.keys	326238.2 Ops/sec
Object.keys	346631.2 Ops/sec

HTML Preparation code:

<script type="text/javascript" src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.8.3/underscore.js"></script>

Script Preparation code:

var o = {}
for(var i = 0; i < 101; i++) {
	o[i] = new Date()
}

Tests: