Benchmark: toLocaleString vs regex

Tests:

regex
const x = 123456; x.toString().replace(/\B(?=(\d{3})+(?!\d))/g, ',');
toLocaleString
const x = 123456; x.toLocaleString('en-US');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
regex
toLocaleString

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 5 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/142.0.0.0 Safari/537.36

Browser/OS: Chrome 142 on Windows

View result in a separate tab

Test name	Executions per second
regex	3034563.5 Ops/sec
toLocaleString	1348489.8 Ops/sec

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

LLMs can make mistakes. Check important info.

**What is being tested:**

The provided JSON represents two JavaScript microbenchmarks that compare the performance of regular expressions (`regex`) with the `toLocaleString` method for formatting numbers.

**Options compared:**

Two options are being compared:

1. **Regular Expressions (regex)**: This approach uses a custom regex pattern to replace every third digit with a comma, effectively formatting the number.
2. **toLocaleString**: This method formats numbers according to the locale and culture of the user's device, using a default format that typically includes commas for thousands.

**Pros and Cons of each approach:**

* **Regular Expressions (regex)**:
	+ Pros:
		- Can be customized to match specific formatting requirements.
		- May be more efficient for simple cases.
	+ Cons:
		- Can be slower due to the overhead of compiling a regex pattern.
		- May not handle complex formatting scenarios correctly.
* **toLocaleString**:
	+ Pros:
		- Handles complex formatting scenarios out of the box.
		- Uses locale-specific formatting, which can improve usability for users in different regions.
	+ Cons:
		- May be slower due to the overhead of formatting according to locale and culture.
		- Requires knowledge of locale-specific formatting options.

**Library usage:**

Neither of these approaches requires a specific library. However, if you were to use `toLocaleString`, it's likely that the browser's built-in localization functionality would be used under the hood.

**Special JS feature or syntax:**

There are no special JavaScript features or syntaxes mentioned in this benchmark. The focus is on comparing the performance of two different string formatting approaches.

**Benchmark preparation code and HTML preparation code:**

The JSON provided only includes script preparation code, which is a simple assignment statement that defines a constant `x` with the value 123456. There is no corresponding HTML preparation code or full benchmark setup.

**Alternatives:**

If you wanted to explore alternative approaches for formatting numbers in JavaScript, some options might include:

1. **Using template literals**: This approach can provide a more readable and concise way to format numbers.
2. **Using a third-party library like moment.js**: These libraries often provide more advanced formatting options and can simplify complex formatting scenarios.
3. **Using a custom implementation with a different algorithm**: Depending on the specific requirements of your project, you might choose to implement a custom number formatting algorithm from scratch.

Keep in mind that each approach has its own trade-offs in terms of performance, readability, and maintainability. The choice ultimately depends on the specific needs and constraints of your project.

Related benchmarks:

toLocaleString vs regex (version: 0)

Comparing performance of: regex vs toLocaleString

Created: 2 years ago by: Guest

Jump to the latest result

regex

toLocaleString

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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