Run results for: underscore isString VS typeof

Run details:

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/125.0.0.0 Safari/537.36

Browser: Chrome 125

Operating system: Windows

Device Platform: Desktop

Date tested: 2 years ago

Benchmark engine: Benchmark.js

native check 2

7.8M/s

native check 1

7.8M/s

underscore check 1

4.9M/s

underscore check 2

4.2M/s

View exact numbers

Test name	Executions per second
✓ native check 2	7,791,406 Ops/sec
native check 1	7,773,352 Ops/sec
underscore check 1	4,874,356 Ops/sec
underscore check 2	4,235,610 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'