Benchmark: df74612a - Regex vs trim

Script Preparation code:

var string = '    mon m0t De P@ss      '

Tests:

regex
/^\S+|\S+$/.test(string)
trim
string === string.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:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36

Browser/OS: Chrome 103 on Windows

View result in a separate tab

Test name	Executions per second
regex	5069785.0 Ops/sec
trim	6064076.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated one month 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 comparing two approaches to remove whitespace from a string: using a regular expression (`/^\S+|\S+$/.test(string)`), and using the built-in `trim()` method (`string === string.trim()`).

**Options Compared**

Here are the options being compared:

1. **Regular Expression (Regex)**: This approach uses a regex pattern to match any non-whitespace characters at the beginning (`^`) or end (`$`) of the string. The `test()` method returns `true` if the pattern matches, and `false` otherwise.
2. **Trim Method**: This approach uses the built-in `trim()` method to remove whitespace from both ends of the string.

**Pros and Cons**

**Regex:**

Pros:

* Can be used for more complex string manipulation tasks
* Can be efficient for large strings

Cons:

* Can be slower due to the overhead of compiling a regex pattern
* May not be as readable or maintainable as other approaches

**Trim Method:**

Pros:

* Fast and efficient
* Simple and readable

Cons:

* Only removes whitespace from both ends of the string, leaving internal whitespace unchanged
* Not suitable for complex string manipulation tasks

**Other Considerations**

The benchmark also skips HTML preparation code, which suggests that the focus is on pure JavaScript performance.

**Library/Function Used**

In this case, no external library or function is used beyond the built-in `trim()` method. The regex pattern is a standard JavaScript pattern.

**Special JS Feature/Syntax**

There are no special JavaScript features or syntax being tested in this benchmark.

**Benchmark Preparation Code and Test Cases**

The preparation code sets up a test string with whitespace characters, and two test cases are defined:

1. **Regex**: Compiles the regex pattern and executes it on the test string.
2. **Trim**: Compares the trimmed string to the original string using the `===` operator.

**Latest Benchmark Result**

The latest results show that the Trim Method outperforms the Regex approach in terms of executions per second, but this may depend on specific use cases or optimizations.

**Other Alternatives**

If you're looking for alternative approaches to remove whitespace from a string, some options include:

* Using a `replace()` method with a regular expression
* Using an array method (e.g., `map()`, `filter()`)
* Using a library function (e.g., Lodash's `removeWhitespace`)

Keep in mind that the choice of approach depends on your specific requirements and performance constraints.

Related benchmarks:

df74612a - Regex vs trim (version: 0)

testing beginning and end whitespace regex vs trim

Comparing performance of: regex vs trim

Created: 2 years ago by: Guest

Jump to the latest result

regex

trim

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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