Benchmark: split vs regex hw2

Script Preparation code:

var str = '09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20:09:11:20';

Tests:

reg
var a = str.match(/(?:[0-5]?[0-9])?(?:[0-5]?[0-9])/g); var b = a[0];
split
var a = str.split(':'); var b = a[0];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
reg
split

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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**Benchmark Overview**

The provided benchmark is designed to compare the performance of two approaches for extracting specific parts of a string: using regular expressions (regex) and splitting on a delimiter.

**Approaches Compared**

There are two individual test cases:

1. **Regex Approach ("reg")**: The script uses `str.match()` with a regex pattern to extract the desired part of the string.
2. **Split Approach ("split")**: The script splits the input string into parts using the ':' character as a delimiter and extracts the first part.

**Pros and Cons**

### Regex Approach

Pros:

* Can be flexible for different extraction patterns
* Allows for more precise control over the extracted data
* Often faster than simple splitting methods

Cons:

* Can be slower due to the overhead of compiling regex patterns
* May require additional libraries or imports for certain features (e.g., `\d` is a digit pattern)
* Can lead to security issues if not properly sanitized

### Split Approach

Pros:

* Typically faster and more lightweight than regex-based approaches
* Simple to implement and maintain, especially for simple string manipulation tasks
* Does not require additional libraries or imports

Cons:

* Limited flexibility for different extraction patterns
* May not work as expected with strings containing multiple delimiters

**Library Usage**

There is no explicit library usage in the provided benchmark. However, it's worth noting that `str.match()` uses a regex engine internally, which may be subject to browser-specific optimizations or variations.

**Special JS Feature/ Syntax**

The only special feature used here is the use of string interpolation (`var str = '...'`) and the dot notation for property access (`var b = a[0];`).

**Alternatives**

Other alternatives for splitting strings include:

* Using `str.split()` with an empty string or an array literal (`[].slice()`)
* Utilizing `Array.prototype.slice()` directly on the input string
* Leveraging third-party libraries like Lodash or Underscore.js, which provide more comprehensive string manipulation utilities

Keep in mind that these alternatives may have varying performance characteristics and may require additional setup or dependencies.

Related benchmarks:

split vs regex hw2 (version: 0)

Comparing performance of: reg vs split

Created: 6 years ago by: Guest

Jump to the latest result

reg

split

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):