Benchmark: replace with regex vs replaceAll

Tests:

replace with regex
'Ala ma kota'.replace(/ /g, '_');
replaceAll
'Ala ma kota'.replaceAll(' ', '_');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
replace with regex
replaceAll

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**What is being tested?**

The provided benchmark compares two approaches to replace spaces with underscores in a given string:

1. Using the `replace()` method with a regular expression (regex) (`/ /g`).
2. Using the `replaceAll()` method from a hypothetical library (we'll get to that later).

**Options compared:**

* The two options being compared are:
	+ `replace()`: a built-in JavaScript method for replacing substrings.
	+ `replaceAll()`: a hypothetical method, likely from a library.

**Pros and Cons:**

* **`replace()`**: Pros:
	+ Built-in method, easy to use, and widely supported.
	+ Optimized for performance by the JavaScript engine.
* Cons:
	+ May not be as flexible or powerful as regex-based methods.
* `replaceAll()`: Pros:
	+ May offer more flexibility and customization options than `replace()`.
	+ Could potentially provide better performance due to optimized library implementations.
* Cons:
	+ Not a built-in method, which might lead to slower execution times or less widespread support.
	+ The existence of this method may imply the use of a custom library, which could add overhead.

**Library:**

The `replaceAll()` method is not a native JavaScript method. Instead, it's likely that the benchmark uses a library like `lodash` (a popular utility library) or another similar implementation. In this case, `replaceAll()` is an alias for the `replace()` method with a custom implementation using regex.

In other words, when you see `replaceAll()`, it's essentially equivalent to calling `replace()` with the same regex pattern (`/ /g`). The hypothetical library might provide some additional features or optimizations over the native `replace()` method.

**Other considerations:**

* **Browser differences**: The benchmark results show two different browsers (Chrome 114) with varying execution per second counts. This highlights the importance of considering browser-specific differences when writing benchmarks.
* **Device platform**: The test was run on a desktop device, which might not be representative of other platforms (e.g., mobile devices).
* **Operating system**: Windows is mentioned as the operating system, but it's unclear if this affects the benchmark results.

**Alternatives:**

If you were to replace `replaceAll()` with another method, you could consider:

* Using a different library or implementation, such as `String.prototype.replace()` from the ECMAScript standard.
* Implementing your own regex-based replacement function.
* Using a streaming approach instead of string manipulation, which might be more efficient for large inputs.

Keep in mind that these alternatives would likely require significant changes to the benchmark code and may not offer substantial benefits over the existing implementation.

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/114.0.0.0 Safari/537.36

Browser/OS: Chrome 114 on Windows

View result in a separate tab

Test name	Executions per second
replace with regex	12743015.0 Ops/sec
replaceAll	10009182.0 Ops/sec

Related benchmarks:

replace with regex vs replaceAll (version: 0)

Comparing performance of: replace with regex vs replaceAll

Created: one year ago by: Guest

Jump to the latest result

replace with regex

replaceAll

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):