Benchmark: regex vs trim test

Script Preparation code:

var string = '    fsajdf ,asdfjosa  , fjoiawejf, oawjfoei ,jaosdjfsdjfo, sfjos, 2324234  , sdf, safjao  , j, o      ,  sdlfks,dflks ,l      '

Tests:

regex
string.replace(/\s/g, '').split(',')
trim
string.split(',').map(str => str.trim())

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
regex
trim

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's dive into the world of JavaScript microbenchmarks!

The provided JSON represents two test cases: `regex` and `trim`. Both tests aim to measure the performance difference between using regular expressions (regex) versus trimming strings in JavaScript.

**Options compared:**

1. **Regex**: Using the `replace()` method with a regex pattern to remove whitespace characters (`\\s`) from the string.
2. **Trim**: Using the built-in `trim()` method to remove whitespace characters from both ends of the string.

**Pros and Cons:**

**Regex approach:**

Pros:

* Allows for more control over the removal process (e.g., removing specific types of whitespace).
* Can be used with other methods, such as `replace()` or `match()`, for more complex text processing.

Cons:

* Generally slower than the `trim()` method due to its overhead.
* Requires more code and complexity to implement.

**Trim approach:**

Pros:

* Faster and more lightweight compared to regex.
* Easier to use and understand, especially for simple cases.

Cons:

* Limited control over the removal process (can only remove whitespace characters).
* May not work correctly with certain types of strings or edge cases.

**Other considerations:**

* The `executionsPerSecond` value indicates that Chrome 94 executed each test case more than 2 million times per second.
* Both tests are run on a Mac OS X 10.15.7 system, which may affect the results due to platform-specific optimizations or differences in hardware.

**Library usage:**

Neither of the provided benchmarks uses any external libraries. The `trim()` method is a built-in JavaScript function, and regex patterns are simply strings that can be used with various methods (e.g., `replace()`, `match()`).

**Special JS features or syntax:**

None mentioned in this benchmark.

**Alternatives:**

For similar microbenchmarks, you might want to try:

1. Measuring the performance of other string manipulation functions, such as `split()`, `join()`, or `substring()`.
2. Comparing different regular expression engines (e.g., RegExp vs. String.prototype.match()).

To prepare a new benchmark, you can use the following steps:

1. Define your test case: Write a JavaScript function that performs the desired operation on a sample input string.
2. Create two versions of the test case:
	* One using regex (with or without libraries).
	* Another using the `trim()` method (or other built-in functions).
3. Use a benchmarking tool like Measurino or Benchmark.js to run your tests and collect data.
4. Analyze the results and adjust parameters as needed for more accurate comparisons.

Feel free to ask if you have any further questions!

Related benchmarks:

regex vs trim test (version: 0)

Comparing performance of: regex vs trim

Created: 4 years ago by: Guest

Jump to the latest result

regex

trim

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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