Benchmark: Split vs Regex find

Script Preparation code:

var str = "creaty-lobby-poker"

Tests:

Split
var split = str.split('-') var el = split[2]
Regex
var regex = str.match(/(\w+)[^-]*$/gm) var el = regex[0]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Split
Regex

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 16 days ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:151.0) Gecko/20100101 Firefox/151.0

Browser/OS: Firefox 151 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
Split	19764480.0 Ops/sec
Regex	2066142.6 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**

The benchmark is designed to compare two approaches: using the `split()` method and using regular expressions (regex) to extract a substring from a string.

**Split() Method**

When we split the input string `"creaty-lobby-poker"` using the `-` character as a delimiter, it returns an array of substrings. The code extracts the third element of this array (`el = split[2]`) and presumably uses it for some purpose.

The pros of using the `split()` method are:

1. **Readability**: The code is straightforward and easy to understand.
2. **Performance**: Splitting a string is generally faster than using regex.

However, there are also some potential downsides:

1. **Limited flexibility**: The delimiter must be a single character (`-` in this case).
2. **Error handling**: If the input string does not contain the expected delimiter, the code may fail or produce unexpected results.

**Regular Expressions (regex)**

The regex approach uses the `/\\w+[-^-]*$/gm` pattern to match any word characters (`\\w+`) followed by zero or more `-` characters. The `g` flag makes the search global, and the `m` flag makes it multi-line. The matched substring is extracted using the first group of the match (`regex[0]`).

The pros of using regex are:

1. **Flexibility**: Regex patterns can be much more complex and flexible than simple delimiters.
2. **Error handling**: Regex patterns can be designed to handle errors and edge cases.

However, there are also some potential downsides:

1. **Performance**: Regex matching is generally slower than string splitting.
2. **Complexity**: Regex patterns can be difficult to read and maintain, especially for complex patterns.

**Library**

There doesn't appear to be a library being used in this benchmark. The `split()` method and regex pattern are built-in JavaScript functions.

**Special JS Feature or Syntax**

None of the code uses any special JavaScript features or syntax that would require explanation beyond what's already provided.

**Other Alternatives**

If you wanted to compare these two approaches, here are some alternative methods:

1. **Using a custom delimiter**: Instead of using a fixed delimiter (`-`), you could use a user-provided delimiter and handle errors accordingly.
2. **Using a regex library**: Some JavaScript libraries (e.g., RegExp) provide additional features or optimizations for regex matching that might be worth exploring.
3. **Using a different string splitting method**: Other string splitting methods, such as `str.indexOf()` or `str.lastIndexOf()`, could be compared to the `split()` method.

Overall, this benchmark provides a simple and straightforward comparison of two common string manipulation techniques in JavaScript: using the `split()` method versus regular expressions.

Related benchmarks:

Split vs Regex find (version: 0)

Comparing performance of: Split vs Regex

Created: 3 years ago by: Guest

Jump to the latest result

Split

Regex

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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