Benchmark: Split vs Repace2

Script Preparation code:

const stringExample = "200px";

Tests:

Split
return "200px".split(0,-2);
Replace
return "200px".replace("px","");

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Split
Replace

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):

LLMs can make mistakes. Check important info.

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

**Benchmark Overview**

The benchmark is designed to compare two different approaches for removing units from a string in JavaScript:

1. `split()`: This method splits a string into an array of substrings using a specified separator. In this case, the separator is set to `-2`, which is an invalid index value. This will likely result in an error or unexpected behavior.
2. `replace()`: This method replaces occurrences of a specified pattern (in this case, `"px"`) with another string.

**Options Compared**

The benchmark compares two options:

* **Split**: Using the `split()` method to remove units from the string.
* **Replace**: Using the `replace()` method to remove units from the string.

**Pros and Cons of Each Approach**

* **Split:**
	+ Pros:
		- Simple to implement.
		- Can be efficient if used correctly (e.g., with a valid separator).
	+ Cons:
		- Invalid index value will likely result in an error or unexpected behavior.
		- May not work as expected for all types of input strings.
* **Replace:**
	+ Pros:
		- Generally more reliable and predictable than `split()`.
		- Can handle a wider range of input strings.
	+ Cons:
		- May be slower for very large strings or strings with many occurrences to replace.

**Library Used**

In this benchmark, the `replace()` method is likely using a library-specific implementation under the hood. Specifically, it's using the `String.prototype.replace()` method, which is part of the ECMAScript standard.

**Special JS Feature/Syntax**

There is no special JavaScript feature or syntax being tested in this benchmark. However, it's worth noting that some browsers may implement certain string methods differently than others.

**Alternative Approaches**

If you wanted to compare alternative approaches for removing units from a string, you could consider the following:

* Using regular expressions (e.g., `String.prototype.replace()` with a regex pattern).
* Using a library like Lodash or Underscore.js with their string manipulation functions.
* Implementing your own custom function using a loop or recursion.

In terms of benchmarks, some popular alternatives include:

* MicroBenchmark: A Python-based benchmarking framework for JavaScript.
* Benchmarkistan: A Node.js-based benchmarking tool that supports multiple benchmark types.
* js-bench: A simple, command-line interface for running and comparing benchmarks in Node.js.

Latest run results:

Run details: (Test run date: 6 years ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/70.0.3538.77 Safari/537.36

Browser/OS: Chrome 70 on Mac OS X 10.13.6

View result in a separate tab

Test name	Executions per second
Split	4845747.0 Ops/sec
Replace	20357488.0 Ops/sec

Related benchmarks:

Split vs Repace2 (version: 0)

Comparing performance of: Split vs Replace

Created: 6 years ago by: Guest

Jump to the latest result

Split

Replace

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 28 days ago):