Benchmark: substring vs. split

Script Preparation code:

var testString = "<1234567890abcde>this is my rifle, this is my gun";

Tests:

substringing
var boolTest = testString[0] === '<' && testString[16] === '>' var result1 = testString.substring(1,16); var result2 = testString.substring(17);
split
var arr = testString.split('>') var result1 = arr[0].substring(1); var result2 = arr[1]

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
substringing
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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Let's break down the benchmark and explain what is being tested.

**Benchmark Definition**

The benchmark is defined by two test cases: `substringing` and `split`. The script preparation code creates a string variable `testString` with a specific value, which will be used to run both tests.

**Test Cases**

1. **Substringing**
	* The test case runs the following JavaScript code:
```javascript
var boolTest = testString[0] === '<' && testString[16] === '>';
var result1 = testString.substring(1, 16);
var result2 = testString.substring(17);
```
This test case checks if the first and last characters of `testString` are `<` and `>`, respectively. It then extracts two substrings from `testString` using `substring()`. The purpose of this test case is likely to compare the performance of `substring()` with different start and end indices.
2. **Split**
	* The test case runs the following JavaScript code:
```javascript
var arr = testString.split('>');
var result1 = arr[0].substring(1);
var result2 = arr[1];
```
This test case splits `testString` into an array using the `>` character as a separator. It then extracts two substrings from the resulting array using `substring()`. The purpose of this test case is likely to compare the performance of splitting a string and then extracting substrings versus using `substring()` directly.

**Comparison Options**

The benchmark compares the execution times of these two approaches:

1. **Substringing (using substring())**: This approach uses `substring()` to extract substrings from `testString`.
2. **Split**: This approach splits `testString` into an array and then extracts substrings using `substring()`.

**Pros and Cons**

* **Substringing (using substring())**:
	+ Pros: simple, straightforward way to extract substrings.
	+ Cons: may not be optimized for performance, can lead to slower execution times due to the overhead of function calls.
* **Split**:
	+ Pros: can take advantage of JavaScript's array methods and optimization, potentially faster execution times.
	+ Cons: requires splitting the string into an array, which can be slower than using `substring()` directly.

**Library/Dependency**

None in this case. The benchmark only uses built-in JavaScript functions.

**Special JS Feature/Syntax**

None mentioned in the benchmark definition or test cases. However, it's worth noting that some newer JavaScript features like `template literals` (introduced in ES2015) might be used to create and manipulate strings in other benchmarks.

**Other Alternatives**

Some alternative approaches that could be compared in this benchmark include:

* Using regular expressions instead of `substring()` or `split()`
* Using a custom function to extract substrings from the string
* Using a different separator character instead of `>`

These alternatives might provide interesting insights into performance, readability, and maintainability trade-offs.

Related benchmarks:

substring vs. split (version: 0)

Comparing performance of: substringing vs split

Created: 4 years ago by: Guest

Jump to the latest result

substringing

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):