Benchmark: Test substring 12344

Script Preparation code:

var example = 'there is no spoonnn there is no spoonnn there is no spoonnn there is no spoonnn there is no spoonnn there is no spoonnn there is no spoonnn there is no spoonnn there is no spoonnn there is no spoonnn '

Tests:

substring
var result = example.substring(0, example.length-1)
slice
var result = example.slice(10)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
substring
slice

Fastest: N/A

Slowest: N/A

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what's being tested.

**Benchmark Overview**

The test case is designed to measure the performance of JavaScript string manipulation methods, specifically `substring` and `slice`, on a large input string. The input string, "there is no spoonnn there is no spoonnn there is no spoonnn there is no spoonnn there is no spoonnn there is no spoonnn there is no spoonnn there is no spoonnn there is no spoonnn ", contains repeated instances of the word "spoon".

**Options Compared**

The two options being compared are:

1. `substring` method:
	* Pros: Can be used to extract a subset of characters from a string, which can be useful in certain scenarios.
	* Cons: May have performance implications due to its dynamic nature and potential overhead.
2. `slice` method:
	* Pros: More efficient than `substring`, especially for extracting multiple substrings, as it avoids creating intermediate strings.
	* Cons: Limited to extracting a subset of characters from the start of the string.

**Pros and Cons**

Using `substring` might be suitable when:

* You need to extract a specific substring with a fixed length.
* You're dealing with a short input string.

However, using `substring` can lead to performance issues due to its dynamic nature and potential overhead.

On the other hand, using `slice` is generally recommended when:

* You need to extract multiple substrings from the same input string.
* You're working with large input strings where efficiency matters.

**Library Used**

There is no explicit library mentioned in the provided benchmark definition. However, it's likely that the implementation of these methods is based on the JavaScript built-in `String` object or a specific library that provides an optimized implementation.

**Special JS Feature/Syntax**

No special features or syntax are used in this benchmark. The code only uses standard JavaScript constructs and does not rely on any advanced features like async/await, closures, or arrow functions.

**Other Alternatives**

If you need to measure the performance of other string manipulation methods or libraries, some alternatives might include:

1. `indexOf` method
2. Regular expressions (regex)
3. String replacement methods (e.g., `replace()`)
4. Library-specific implementations (e.g., Lodash's `stringUtils.slice()`)

Keep in mind that these alternatives may have different performance characteristics and use cases, and the best approach will depend on your specific requirements.

Overall, this benchmark provides a simple yet effective way to measure the performance of two commonly used string manipulation methods in JavaScript.

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/111.0.0.0 Safari/537.36

Browser/OS: Chrome 111 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
substring	14061529.0 Ops/sec
slice	27687192.0 Ops/sec

Related benchmarks:

Test substring 12344 (version: 0)

Comparing performance of: substring vs slice

Created: one year ago by: Guest

Jump to the latest result

substring

slice

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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