Benchmark: replaceAll vs regex replace native

Tests:

replace regex
"this is it".replace(/ /g, "+");
replace All
"this is it".replaceAll(" ", "+");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
replace regex
replace All

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 7 months ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36

Browser/OS: Chrome 128 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
replace regex	11940783.0 Ops/sec
replace All	10004779.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

I'd be happy to help you understand the provided JavaScript microbenchmark.

**Benchmark Definition and Options**

The benchmark compares two approaches for replacing whitespace characters in a string:

1. `replace()` method with a regular expression (regex): This approach uses the `String.prototype.replace()` method, which applies a regex pattern to each character in the string, replacing matches with a specified replacement value.
2. `replaceAll()` method: This is not a built-in JavaScript method. Instead, it's likely a custom implementation that mimics the behavior of the `replace()` method for multiple whitespace characters.

**Pros and Cons**

- **replace() method (regex)**:
	+ Pros: Efficient and widely supported by modern browsers.
	+ Cons: Can be slower than the alternative approach if used with complex regex patterns, and may not work as expected in older browsers or those that don't support Unicode characters.
- `replaceAll()` method (custom implementation):
	+ Pros: May be faster for simple cases and works consistently across browsers, assuming a correct implementation.
	+ Cons: Uncommon and might require more code to implement correctly.

**Library and Special Features**

There are no libraries mentioned in the provided benchmark definition. However, if you're interested in exploring alternatives or learning about regex patterns, I can provide some resources.

The `replace()` method uses special features like:

* Regex patterns (e.g., `/ /g`, `\+`)
* String literals (e.g., `"this is it".replace(...)`)
* Function calls (e.g., `.replace()`)
* Global and flag options for the regex pattern

If you're interested in learning more about regex, I can provide some resources or explanations.

**Other Alternatives**

Some other alternatives to measure string replacement performance include:

1. Using a different library like `lodash` or `string-promise`, which might implement optimized string replacement methods.
2. Implementing a custom string replacement algorithm using JavaScript's built-in array and loop operations.
3. Comparing the performance of regex engines like ` RegExp` (Native) vs. `String.prototype.replace()`.

Keep in mind that these alternatives will likely produce different results or be more challenging to set up, depending on your specific use case.

For a wide range of software engineers, I recommend focusing on understanding the basics of string replacement using built-in JavaScript methods and exploring optimizations as needed for performance-critical applications.

Related benchmarks:

replaceAll vs regex replace native (version: 0)

Comparing performance of: replace regex vs replace All

Created: 7 months ago by: Guest

Jump to the latest result

replace regex

replace All

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):