Benchmark: native replaceAll vs regex replace

Tests:

replace regex
"Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.".replace(/ +/g, "");
replace All
"Lorem Ipsum is simply dummy text of the printing and typesetting industry. Lorem Ipsum has been the industry's standard dummy text ever since the 1500s, when an unknown printer took a galley of type and scrambled it to make a type specimen book. It has survived not only five centuries, but also the leap into electronic typesetting, remaining essentially unchanged. It was popularised in the 1960s with the release of Letraset sheets containing Lorem Ipsum passages, and more recently with desktop publishing software like Aldus PageMaker including versions of Lorem Ipsum.".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

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks!

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The benchmark in question compares the performance of two approaches for replacing whitespace characters with an empty string: using `replaceAll()` (a built-in method) versus using a regular expression (`/ +/g`).

**Options Compared**

The two options compared are:

1. **Native `replaceAll()`**: This approach uses the built-in `replaceAll()` method, which is optimized by JavaScript engines for performance.
2. **Regular Expression with `+` and `g` flags**: This approach uses a regular expression (`/ +/g`) to match one or more whitespace characters (`\s+`) and replaces them with an empty string.

**Pros and Cons**

**Native `replaceAll()`**:

Pros:

* Optimized by JavaScript engines for performance
* Simple to implement

Cons:

* May not work as expected in certain edge cases (e.g., Unicode whitespace)
* Not explicitly designed for performance optimization

**Regular Expression with `+` and `g` flags**:

Pros:

* Can handle Unicode whitespace characters correctly
* Allows for more control over the replacement process

Cons:

* Slower than native `replaceAll()` due to regular expression parsing and execution
* More complex to implement (requires understanding of regular expressions)

**Library**

The `replaceAll()` method is a built-in method in JavaScript, which means it doesn't require any external libraries.

**Special JS Feature/Syntax**

There is no special JavaScript feature or syntax used in this benchmark. Both approaches use standard JavaScript syntax.

**Other Alternatives**

If you wanted to test other approaches, some alternatives could be:

* Using a library like `js-regexp` or `regex-perf` for regular expression-based testing
* Implementing a custom whitespace replacement function using loops and conditional statements
* Testing other built-in methods, such as `replace()` with a single character (e.g., `\s` instead of `\s+`)
* Using a benchmarking library like Benchmark.js to measure performance

In summary, the benchmark compares two approaches for replacing whitespace characters: native `replaceAll()` versus regular expression with `+` and `g` flags. The native approach is optimized by JavaScript engines for performance, while the regular expression approach provides more control over the replacement process but may be slower due to parsing and execution overhead.

Latest run results:

Run details: (Test run date: one year ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/115.0.0.0 Safari/537.36

Browser/OS: Chrome 115 on Windows

View result in a separate tab

Test name	Executions per second
replace regex	329984.6 Ops/sec
replace All	501294.9 Ops/sec

Related benchmarks:

native replaceAll vs regex replace (version: 0)

Comparing performance of: replace regex vs replace All

Created: 2 years 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 one month ago):