Benchmark: underscore isString VS typeof

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'

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
underscore check 1
underscore check 2
native check 1
native check 2

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 6 months ago)

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/OS: Chrome 125 on Windows

View result in a separate tab

Test name	Executions per second
underscore check 1	4874355.5 Ops/sec
underscore check 2	4235609.5 Ops/sec
native check 1	7773351.5 Ops/sec
native check 2	7791405.5 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):

LLMs can make mistakes. Check important info.

Let's break down the benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark is comparing the performance of two approaches to check if a string is equal to another string:

1. **Native Check**: Using the `typeof` operator with a double-equal (`===`) to check if the type of an object or variable is 'string'.
2. **Underscore.js Check**: Using the `_` (Underscore.js) library's `isString()` function to check if a value is a string.

**Options Being Compared**

The benchmark is comparing the performance of two options:

1. **Native Check**: Using the `typeof` operator with `===`.
2. **Underscore.js Check**: Using the `_` library's `isString()` function.

**Pros and Cons of Each Approach**

* **Native Check**:
	+ Pros: No additional dependency required, simple to implement.
	+ Cons: May not work as expected for certain types (e.g., `NaN`, `undefined`) or edge cases (e.g., `""`).
* **Underscore.js Check**:
	+ Pros: Handles edge cases and provides a more robust way to check if a value is a string. No need to manually type-check.
	+ Cons: Requires an additional dependency (`underscore.js`), which may introduce overhead.

**Library and Its Purpose**

The `underscore.js` library is a popular utility function for JavaScript that provides various helper functions, including `isString()`, to simplify common tasks like data manipulation and validation. In this benchmark, the `isString()` function is used to check if a value is a string.

**Special JS Feature or Syntax**

There are no special JavaScript features or syntax mentioned in this benchmark. The tests only use standard JavaScript operators (`===`) and built-in functions (e.g., `typeof`).

**Other Alternatives**

If you're looking for alternative ways to check if a string is equal to another string, here are some options:

1. **RegExp**: Use a regular expression to match the strings exactly.
2. **String comparison with `===`**: Compare the strings using the standard `===` operator.
3. **Custom implementation**: Implement your own function to compare strings.

Keep in mind that the performance of these alternatives may vary depending on the specific use case and requirements.

Related benchmarks:

underscore isString VS typeof (version: 0)

Comparing performance of: underscore check 1 vs underscore check 2 vs native check 1 vs native check 2

Created: one year ago by: Guest

Jump to the latest result

underscore check 1

underscore check 2

native check 1

native check 2

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated one month ago):