Benchmark: slice substring - MeasureThat.net

Script Preparation code:

var example = 'DJMFOMej1F9zZgZ3NiDtcM2O1Jc0mHCm7YbQ3EKKDHY'

Tests:

slice
example.slice(0, 16)
substring
example.substring(0, 16)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice
substring

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 25 days ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/146.0.0.0 Safari/537.36 Edg/146.0.0.0

Browser/OS: Chrome 146 on Windows

View result in a separate tab

Test name	Executions per second
slice	104969376.0 Ops/sec
substring	111283640.0 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 benchmark measures the performance difference between two string manipulation methods in JavaScript: `slice` and `substring`. Specifically, it tests how many executions per second each method can handle a substring of a given length (16 characters) from a predefined example string.

**Options compared**

There are only two options being compared:

1. **`slice`**: The `slice` method is used to extract a section of a string.
2. **`substring`**: The `substring` method is also used to extract a section of a string, although it has some additional features (like allowing for start and end indices).

**Pros and cons**

Here's a brief summary:

* **`slice`**:
	+ Pros: Generally faster than `substring`, as it avoids the overhead of creating an intermediate string.
	+ Cons: Can be less intuitive to use, especially when dealing with edge cases (like negative indices).
* **`substring`**:
	+ Pros: More flexible and easier to understand, as it allows for start and end indices.
	+ Cons: May be slower than `slice`, depending on the specific use case.

In this benchmark, the performance difference between the two methods is relatively small, but it's still interesting to see how each method performs in different scenarios.

**Library usage**

Neither `slice` nor `substring` rely on any external libraries. They are built-in methods of the JavaScript String prototype.

**Special JS features or syntax**

This benchmark does not use any special JavaScript features or syntax beyond what is considered standard in JavaScript. However, it's worth noting that both `slice` and `substring` can handle edge cases like negative indices, which might be important to consider when writing production code.

**Other alternatives**

If you needed to compare other string manipulation methods, some alternatives could include:

* **`replace()`**: Replaces occurrences of a pattern in a string.
* **`indexOf()`/`lastIndexOf()`: Returns the index of the first or last occurrence of a substring.
* **`split()`**: Splits a string into an array of substrings.

Keep in mind that each method has its own strengths and weaknesses, and the choice ultimately depends on the specific use case and requirements.

I hope this explanation helps you understand what's being tested in this benchmark!

Related benchmarks:

slice substring (version: 0)

Comparing performance of: slice vs substring

Created: 4 years ago by: Guest

Jump to the latest result

slice

substring

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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