Benchmark: substring then split v.s. split then shift

Script Preparation code:

var uri = "/api/guilds/guildId/members/memberId";

Tests:

substring then split
uri.substring(5).split('/');
split then shift
uri.split('/').shift();

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
substring then split
split then shift

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/88.0.4324.192 Safari/537.36

Browser/OS: Chrome 88 on Windows

View result in a separate tab

Test name	Executions per second
substring then split	1087208.8 Ops/sec
split then shift	2383001.8 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark test and its results.

**What is tested:**

The benchmark tests two approaches to splitting a URL string:

1. `uri.substring(5).split('/')`: This approach first extracts the substring starting from index 5 (skipping the first five characters of the original URL) and then splits it into an array using the `/` character as the separator.
2. `uri.split('/').shift()`: This approach first splits the original URL into an array using the `/` character as the separator, and then shifts one element off the beginning of the array ( effectively removing the first part of the URL).

**Options compared:**

The two approaches are being compared to determine which one is faster.

**Pros and Cons:**

1. **`uri.substring(5).split('/')`**:
	* Pros:
		+ More straightforward and intuitive approach.
		+ May be more efficient if the substring starts at a fixed position (in this case, 5).
	* Cons:
		+ Requires manual index selection, which can lead to errors or off-by-one issues.
2. **`uri.split('/').shift()`**:
	* Pros:
		+ More concise and easy to read.
		+ Shifts the first element, effectively removing it from the array, making it more suitable for URL parsing.
	* Cons:
		+ Can be less efficient if the resulting array has a large number of elements.

**Library usage:**

None of the test cases use any libraries. The benchmark is testing only JavaScript core functionality.

**Special JS feature or syntax:**

The benchmark uses JavaScript's `shift()` method, which removes and returns the first element from an array. This is a standard JavaScript method, but it's not specifically tied to any particular version or syntax.

**Other alternatives:**

To implement this benchmark in other programming languages, you would need to:

1. Choose a URL parsing library (if needed).
2. Implement string splitting logic.
3. Use language-specific features for shifting elements from an array (e.g., `pop()` in Python).

For example, in Python:
```python
import re

# equivalent to JavaScript's split('/')
url = "/api/guilds/guildId/members/memberId"
parts = url.split('/')

# equivalent to JavaScript's shift()
first_part = parts.pop(0)
```
Keep in mind that this is a simplified example and might not cover all edge cases.

In summary, the benchmark tests two approaches to splitting a URL string using JavaScript core functionality. The `uri.substring(5).split('/')` approach requires manual index selection, while the `uri.split('/').shift()` approach uses language-specific features for shifting elements from an array.

Related benchmarks:

substring then split v.s. split then shift (version: 0)

Comparing performance of: substring then split vs split then shift

Created: 3 years ago by: Guest

Jump to the latest result

substring then split

split then shift

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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