Benchmark: split vs substring

Script Preparation code:

var example = 'there is no spoon'

Tests:

split
var result = example.split(' ')
substring
var result = example.substring(10)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
split
substring

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 years ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:121.0) Gecko/20100101 Firefox/121.0

Browser/OS: Firefox 121 on Windows

View result in a separate tab

Test name	Executions per second
split	9252337.0 Ops/sec
substring	1205724288.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided JSON data and explain what is being tested, compared, and analyzed.

**Benchmark Definition**

The benchmark defines two test cases: `split` and `substring`. The description explains that these tests compare the performance of slicing (`split`) versus substring extraction when only a start index is specified.

**Options Compared**

Two options are being compared:

1. **Slice (`split`)**: This method returns a new string containing an array of substrings created by splitting the original string at each occurrence of the specified separator (in this case, a space).
2. **Substring (`substring`)**: This method returns a subset of characters from the original string, starting from the specified start index and ending at the end of the string.

**Pros and Cons**

* **Slice (`split`)**: Pros:
	+ Returns an array of substrings, which can be useful for processing multiple parts of a string simultaneously.
	+ Can be more flexible when working with complex strings or multiple separators.
* Cons:
	+ Creates a new string and array, which may lead to higher memory usage and slower performance compared to substring extraction.
* **Substring (`substring`)**: Pros:
	+ Returns a single subset of characters from the original string, which can be faster and more memory-efficient than creating an array of substrings.
	+ Can be useful when only a specific part of the string is needed.
* Cons:
	+ May not be as flexible as slicing when working with complex strings or multiple separators.

**Library: None**

There is no external library being used in this benchmark. The tests are purely focusing on the built-in JavaScript methods `split` and `substring`.

**Special JS Feature/Syntax: None**

There is no special JavaScript feature or syntax being tested in this benchmark.

**Other Alternatives**

If you wanted to compare other string manipulation techniques, you might consider testing:

* **String slicing using bracket notation (`example[10]`)**: This method returns a single character from the original string at the specified index.
* **Regular expressions (` RegExp.prototype.exec()` or `String.prototype.replace()`)**: These methods can be used for more complex string manipulations and pattern matching.

**Test Case Interpretation**

Based on the benchmark results, it appears that substring extraction is slightly faster than slicing in this specific test case. However, keep in mind that the performance differences between these two methods may vary depending on the specific use case and input data.

When interpreting the benchmark results, consider factors like:

* The size of the input string: Larger strings may benefit more from substring extraction due to reduced memory usage.
* The frequency of substring requests: If you need to extract substrings frequently, using `substring` might be a better choice.
* Other performance considerations: Memory usage and garbage collection overhead should also be taken into account when deciding between slicing and substring extraction.

I hope this explanation helps!

Related benchmarks:

split vs substring (version: 0)

Compares slice, substr and substring to each other when there is only a start index

Comparing performance of: split vs substring

Created: 7 years ago by: Guest

Jump to the latest result

split

substring

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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