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: 2 years 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

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

Autogenerated LLM Summary (model llama3.2:3b, generated one year 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.

underscore isString VS typeof (version: 0) Benchmark.js

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

Created: 3 years ago by: Guest

Go to the latest result

underscore check 1

underscore check 2

native check 1

native check 2

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

underscore isString VS typeof (version: 0) Benchmark.js

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

Created: 3 years ago by: Guest

Go to the latest result

underscore check 1

underscore check 2

native check 1

native check 2

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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

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