Run results for: underscore isString VS typeof

Run details:

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36

Browser: Chrome 120

Operating system: Mac OS X 10.15.7

Device Platform: Desktop

Date tested: 2 years ago

Test name	Executions per second
underscore check 1	1767732.5 Ops/sec
underscore check 2	3289071.8 Ops/sec
native check 1	6846872.0 Ops/sec
native check 2	7209450.0 Ops/sec

HTML Preparation code:

<script src="https://cdnjs.cloudflare.com/ajax/libs/underscore.js/1.13.6/underscore-min.js" integrity="sha512-2V49R8ndaagCOnwmj8QnbT1Gz/rie17UouD9Re5WxbzRVUGoftCu5IuqqtAM9+UC3fwfHCSJR1hkzNQh/2wdtg==" crossorigin="anonymous" referrerpolicy="no-referrer"></script>

Script Preparation code:

var MyObject = {
  description: 'a',
  myNumber: 123456789,
  myBoolean: true,
};
var myString = "abcdef"

var myCopy = null;

Tests:

underscore check 1
myCopy = _.isString(MyObject);
underscore check 2
myCopy = _.isString(myString);
native check 1
myCopy = typeof MyObject === 'string'
native check 2
myCopy = typeof myString === 'string'

Run results for: underscore isString VS typeof

underscore check 1

underscore check 2

native check 1

native check 2