Benchmark: slice and substring

Tests:

slice
let x = 'hello' x.slice(1)
substring
let x = 'hello' x.substring(1)

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: one year ago)

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10.15; rv:138.0) Gecko/20100101 Firefox/138.0

Browser/OS: Firefox 138 on Mac OS X 10.15

View result in a separate tab

Test name	Executions per second
slice	668841792.0 Ops/sec
substring	660708160.0 Ops/sec

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

LLMs can make mistakes. Check important info.

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

**Benchmark Definition**

The benchmark definition is a JSON object that provides information about the test case. In this case, there are two test cases: "slice" and "substring". The script preparation code and HTML preparation code are empty, which means no additional setup or configuration is required for these tests.

**Options being compared**

For each test case, we're comparing two different approaches:

1. `x.slice(1)`: This uses the `slice()` method to extract a subset of characters from the string.
2. `x.substring(1)`: This uses the `substring()` method to extract a substring from the string.

**Pros and Cons**

Both methods achieve the same result, but with some differences:

*   **Performance**: In general, `slice()` is faster than `substring()`, especially for large strings. However, in this benchmark, there's no noticeable difference.
*   **String manipulation**: `slice()` allows you to specify a start index and an optional end index. It returns a new string with the specified characters extracted. On the other hand, `substring()` only takes two arguments: the start and end indices. Both methods return a new string, but they behave slightly differently if the input is not a valid index.
*   **Browser support**: Both methods are widely supported across browsers, but some older browsers might not work with `slice()` or have quirks when using `substring()`.
*   **Readability and maintainability**: Some developers prefer `substring()` because it's more explicit about what the method does. Others prefer `slice()` for its brevity.

**Library usage**

Neither of these methods uses any external libraries, so there are no libraries to consider here.

**Special JavaScript features or syntax**

There aren't any special JavaScript features or syntax used in these test cases.

**Other alternatives**

If you needed to slice a string in JavaScript, before `slice()` and `substring()` were introduced, developers could use the following methods:

*   **String slicing with indexing**: You can use array-like indexing (e.g., `[start..end]`) for substrings. However, this approach is less efficient than using the built-in `slice()` or `substring()` methods.
*   **Using a regular expression**: You can use the `substr` function from the `RegExp` class to extract a substring. For example: `"hello".substr(1)` would return `"ello"`.

Related benchmarks:

slice and substring (version: 0)

Comparing performance of: slice vs substring

Created: 2 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):