Benchmark: slice vs split - MeasureThat.net

Script Preparation code:

var rgb = "rgba(255,255,255,0.7)";

Tests:

slice
rgb.slice(0, -5);
split
rgb.split('(');

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice
split

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Windows

View result in a separate tab

Test name	Executions per second
slice	152096048.0 Ops/sec
split	35798736.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks.

**What is being tested?**

The provided JSON represents a benchmark test for comparing two approaches to extract a substring from a string: `slice` and `split`. The test is designed to measure which approach is faster, more efficient, or both.

**Options compared**

In this benchmark, we have two options:

1. **`rgb.slice(0, -5)`**: This option uses the `slice()` method to extract 5 characters from the end of the `rgb` string.
2. **`rgb.split('(');`**: This option uses the `split()` method with a regular expression that matches a single opening parenthesis (`'('`) and extracts the resulting array of substrings.

**Pros and Cons**

* **`slice()` approach:**
	+ Pros:
		- Faster, as it directly accesses the desired substring without creating an intermediate array.
		- More efficient, as it uses native string manipulation functions.
	+ Cons:
		- May not work correctly if the input string has an odd length, as `slice` will truncate the string instead of returning a specific number of characters from the end.
* **`split()` approach:**
	+ Pros:
		- Works correctly with both even and odd-length strings, as it returns all substrings after the specified separator.
	+ Cons:
		- May be slower due to the overhead of creating an intermediate array.

**Library**

In this benchmark, there is no explicit library mentioned. However, if we consider the `split()` method, it's worth noting that JavaScript's built-in regular expression engine is used under the hood. No additional libraries are required for this test.

**Special JS feature or syntax**

There are no special features or syntaxes being tested in this benchmark. Both approaches use standard JavaScript methods (`slice()` and `split()`) without any experimental or proprietary features.

**Other alternatives**

If we were to consider alternative approaches, some possible options could be:

* Using a library like `lodash` which provides the `cloneSlice()` method for string manipulation.
* Utilizing a regular expression engine like `RegExp` with the `match()` method instead of `split()`.
* Implementing custom substring extraction logic using JavaScript's built-in string manipulation functions, such as `substring()` or `substr()`.

Keep in mind that these alternative approaches would likely have different performance characteristics and might not be suitable for all use cases.

Related benchmarks:

slice vs split (version: 1)

Comparing performance of: slice vs split

Created: 3 years ago by: Registered User

Jump to the latest result

slice

split

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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