Benchmark: double split vs regex

Script Preparation code:

var str = 'some:text(here)';

Tests:

2xsplit
let [,str2] = str.split(':'); let [str3] = str.split('(');
regex
let str4 = str.split(/[:(]/);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
2xsplit
regex

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

The provided JSON represents a benchmark test case on MeasureThat.net, which compares two approaches for splitting a string: the `split()` method with multiple arguments and using regular expressions (regex).

**Split() Method with Multiple Arguments**

This approach uses the `split()` method to split the input string `str` into an array of substrings. The first argument `:` is used as the separator, and the second argument `(` is also used as a separator.

**Regex Approach**

This approach uses regular expressions to split the input string `str`. The regex pattern `[:(]` matches both `:` and `(` characters.

Now, let's discuss the pros and cons of each approach:

**Split() Method with Multiple Arguments:**

Pros:

*   Efficient for simple cases where the separators are known.
*   Less prone to errors due to the explicit use of separators.
*   Can be faster in some JavaScript engines.

Cons:

*   Requires specifying both separators, which can lead to issues if the order or characters are incorrect.
*   May not work correctly with edge cases (e.g., consecutive separators).

**Regex Approach:**

Pros:

*   More flexible and powerful for complex splitting scenarios.
*   Can handle edge cases and consecutive separators.

Cons:

*   Slower due to the overhead of regular expression evaluation.
*   Prone to errors if the regex pattern is incorrect or ambiguous.

Other considerations:

*   **Performance**: The regex approach may be slower in this particular case, but it's essential to note that performance can vary depending on the specific JavaScript engine and use cases. In some scenarios, the `split()` method with multiple arguments might be faster.
*   **Code Readability and Maintainability**: The `split()` method with multiple arguments is more readable and maintainable due to its explicit nature. The regex approach requires a better understanding of regular expressions to avoid errors.

**Other Alternatives**

If you need to split strings, consider using the `String.prototype.split()` method or libraries like:

*   **lodash` (`.strSplit()`) - A popular utility library for JavaScript.
*   **moment.js` (`.split(')')`) - A date and time formatting library that includes string splitting capabilities.

In conclusion, both approaches have their strengths and weaknesses. The `split()` method with multiple arguments is a good choice when you know the exact separators, while the regex approach provides more flexibility but may be slower due to performance overhead.

In this specific case, MeasureThat.net tests both methods to compare their performance and demonstrate that the regex approach might be slower in certain scenarios.

Latest run results:

Run details: (Test run date: 3 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/90.0.4430.212 Safari/537.36

Browser/OS: Chrome 90 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
2xsplit	3071228.5 Ops/sec
regex	4627621.5 Ops/sec

Related benchmarks:

double split vs regex (version: 0)

Comparing performance of: 2xsplit vs regex

Created: 3 years ago by: Guest

Jump to the latest result

2xsplit

regex

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 26 days ago):