Benchmark: Regex vs split/join 23313

Script Preparation code:

var str = '/3123/213/123/412/41/4';

Tests:

Regex
str.replace(/\//g, "$&Z");
Split and Join
str.split('').join('Z') + 'Z';

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Regex
Split and Join

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:132.0) Gecko/20100101 Firefox/132.0

Browser/OS: Firefox 132 on Windows

View result in a separate tab

Test name	Executions per second
Regex	1327056.5 Ops/sec
Split and Join	4505553.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down what's being tested in this JavaScript microbenchmark.

**Benchmark Definition**

The benchmark is designed to compare the performance of two approaches: using a regular expression (`Regex`) and splitting an array of strings into individual elements and then joining them back together using `join()` (`Split and Join`).

**Script Preparation Code**

The script preparation code defines a single input string:
```javascript
var str = '/3123/213/123/412/41/4';
```
This is the string that will be used as input for both benchmarking approaches.

**Options Compared**

Here's what's being compared:

* `Regex` (using `replace()` method with a regular expression)
	+ Pros:
		- Can match and replace patterns in the string
		- Can handle complex regular expressions
	+ Cons:
		- May be slower than other approaches due to parsing and execution time of the regex engine
		- May have performance issues if the pattern is too complex or large
* `Split and Join` (using `split()` and `join()` methods)
	+ Pros:
		- Typically faster than regex due to native support for array manipulation
		- Can be more readable and maintainable, especially for simple use cases

**Library Used**

There doesn't appear to be any explicit libraries used in this benchmark. However, it's worth noting that `Regex` relies on the JavaScript engine's built-in regex functionality.

**Special JS Features or Syntax**

None mentioned.

**Other Considerations**

When choosing between these two approaches, consider the following:

* If you need to perform complex pattern matching or string manipulation, `Regex` might be a better choice. However, this comes at the cost of potential performance issues.
* If you're working with simple strings and need fast execution, `Split and Join` is likely a better option.

**Alternatives**

Some alternative approaches could include:

* Using a different string manipulation library (e.g., jQuery)
* Implementing a custom string processing algorithm
* Utilizing WebAssembly or native code for performance-critical tasks

However, these alternatives would require significant modifications to the benchmark and are not immediately apparent from the provided information.

Overall, this benchmark provides a straightforward comparison of two common JavaScript approaches to string manipulation: `Regex` and `Split and Join`. By analyzing the results, developers can gain insights into which approach might be better suited for their specific use case.

Related benchmarks:

Regex vs split/join 23313 (version: 0)

Comparing performance of: Regex vs Split and Join

Created: 2 years ago by: Guest

Jump to the latest result

Regex

Split and Join

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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