Benchmark: get last element of path: split vs regex

Script Preparation code:

var text = '/test/abcd/'

Tests:

get last element of path: split
text.split('/').filter(s => s)
get last element of path: regex
text.match(/([^/]+)\/?$/)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
get last element of path: split
get last element of path: regex

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: one month ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
get last element of path: split	13571296.0 Ops/sec
get last element of path: regex	9347377.0 Ops/sec

Autogenerated LLM Summary (model llama3.1:latest, generated 2 months ago):

LLMs can make mistakes. Check important info.

Let's break down what's being tested and compared in this benchmark.

**Benchmark Name:** "Get Last Element of Path: Split vs Regex"

**What is being tested:** The benchmark compares two different approaches to extracting the last element from a path string using JavaScript. A path string can be something like "/test/abcd/" or "/path/to/file.txt".

**Test Case 1: "get last element of path: split"**

In this test case, the benchmark uses the `split()` method to divide the path string into an array of substrings, separated by slashes (`"/"`). It then filters out any empty strings using the `filter()` method and returns the last non-empty string in the array.

Example code:
```javascript
text.split('/').filter(s => s)
```
**Test Case 2: "get last element of path: regex"**

In this test case, the benchmark uses a regular expression (`/([^\/]+)\/?$/`) to match the last element from the path string. The regular expression breaks down as follows:

* `([^\/]+)` matches one or more characters that are not slashes (`"/"`), capturing them in a group.
* `\/*` matches an optional slash at the end of the string (i.e., it's followed by zero or more slashes).
* `$` asserts that the match must be at the end of the string.

The regular expression returns the captured group, which is the last element from the path string.

Example code:
```javascript
text.match(/([^\/]+)\/?$/)
```
**What are we comparing?**

We're comparing two different approaches to achieving the same result: extracting the last element from a path string. The two test cases use distinct methods:

* `split()` and `filter()`: These methods are part of the JavaScript Array prototype and are used to manipulate arrays.
* Regular Expressions (`/regex/i`): This method is also a built-in JavaScript feature that allows for complex pattern matching.

**Pros and Cons:**

* **Split and Filter:** Pros:
	+ Easy to understand and implement, even for developers without extensive experience with regular expressions.
	+ Good performance when the path string is short or has few elements.
* Cons:
	+ Can be slower than regular expressions for longer or more complex path strings.
	+ Requires extra filtering logic to remove empty strings from the array.
* **Regular Expressions:** Pros:
	+ Highly efficient and fast, even for long or complex path strings.
	+ Provides a concise and expressive way to match patterns in strings.
* Cons:
	+ Can be difficult to understand and implement, especially for developers without experience with regular expressions.
	+ May have performance issues if not optimized correctly.

**Other Considerations:**

When choosing between these approaches, consider the following:

* Performance-critical code: If you're working on a high-performance application or component, using regular expressions might be a better choice due to their efficiency.
* Code readability and maintainability: If you prioritize easy-to-understand and implement code, even if it's slightly slower, then `split()` and `filter()` might be the way to go.

**Library Usage:** None in this benchmark.

Related benchmarks:

get last element of path: split vs regex (version: 0)

Comparing performance of: get last element of path: split vs get last element of path: regex

Created: 4 years ago by: Guest

Jump to the latest result

get last element of path: split

get last element of path: regex

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.1:latest, generated 2 months ago):