Benchmark: split vs substring (correct version)

Script Preparation code:

var example = 'there is no spoon'

Tests:

split
var result = example.split(' ')
substring (hard coded)
var result = [ example.substring(0, 5), example.substring(6, 8), example.substring(9, 11), example.substring(12), ]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
split
substring (hard coded)

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its components.

**Benchmark Definition**
The benchmark compares three JavaScript methods: `split`, `substr` (also known as `slice`), and their corresponding "correct" versions, which are not shown in the provided code snippet. The goal is to measure the performance of these methods when used with only a start index.

**Script Preparation Code**
A simple string variable named `example` is created with the value `'there is no spoon'`.

**HTML Preparation Code**
There is no HTML preparation code provided, which means this benchmark focuses solely on JavaScript execution and does not take into account DOM interactions or other UI-related factors.

**Test Cases**

1. **split**
This test case measures the performance of the `split` method when used with only a start index. This method returns an array of substrings split at each space character.
2. **substring (hard coded)**
This test case measures the performance of the `substring` method when used with hardcoded indices to extract specific parts of the string.

**Options Compared**

The benchmark compares two approaches:

1. **split**: uses the built-in `split` method, which returns an array of substrings.
2. **substring (hard coded)**: uses a custom implementation of the `substring` method, where the start and end indices are hardcoded to extract specific parts of the string.

**Pros and Cons**

1. **split**:
	* Pros: native JavaScript method, well-optimized by browsers for performance.
	* Cons: may not be suitable for all use cases (e.g., when only a start index is available).
2. **substring (hard coded)**:
	* Pros: can be optimized for specific use cases where only a start index is used.
	* Cons: custom implementation, which might not be as efficient or robust as the native `split` method.

**Other Considerations**

* The benchmark does not account for edge cases, such as an empty string or null input.
* It's worth noting that the "correct" version of the `substring` method is not shown in the provided code snippet. This might indicate that the custom implementation is intended to mimic the behavior of the native `split` method.

**Alternatives**

Other alternatives for the `split` and `substring` methods include:

* Using a regular expression with the `match()` method, which can also return an array of substrings.
* Implementing a custom substring extraction function using bitwise operations or other optimization techniques.

Keep in mind that these alternatives are not explicitly tested in this benchmark.

Related benchmarks:

split vs substring (correct version) (version: 0)

Compares slice, substr and substring to each other when there is only a start index, check the split vs substring benchmark for the original version. It's also not fair since the substring split points are hardcoded

Comparing performance of: split vs substring (hard coded)

Created: 2 years ago by: Guest

Jump to the latest result

split

substring (hard coded)

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):