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toLocaleString vs regex
(version: 0)
Benchmark.js
Comparing performance of:
regex vs toLocaleString
Created:
3 years ago
by:
Guest
Go to the latest result
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>
Run tests (2)
Previous results
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Test case name
Result
regex
toLocaleString
Fastest:
N/A
Slowest:
N/A
Latest run results:
Run details:
(Test run date:
9 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
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Embed Benchmark Result
<iframe src="https://measurethat.net/Embed?id=621794" width="100%" height="500px"></iframe>
regex
3.0M/s
toLocaleString
1.3M/s
View exact numbers
Test name
Executions per second
✓
regex
3,034,564 Ops/sec
toLocaleString
1,348,490 Ops/sec
Autogenerated LLM Summary
(model
llama3.2:3b
, generated one year ago):
**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.
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