Benchmark: slice vs substr vs substring (with end index 2)

Script Preparation code:

var example = 'there is no spoon, only death'

Tests:

slice
var result = example.slice(0, example.length-10)
substr
var result = example.substr(0, example.length-10)
substring
var result = example.substring(0, example.length-10)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
slice
substr
substring

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/145.0.0.0 Safari/537.36 Edg/145.0.0.0

Browser/OS: Chrome 145 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
slice	148252480.0 Ops/sec
substr	143724704.0 Ops/sec
substring	147858400.0 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 benchmark and its test cases.

**Benchmark Definition**

The `slice vs substr vs substring (with end index 2)` benchmark compares the performance of three JavaScript string manipulation methods: `slice()`, `substr()`, and `substring()` with an ending index. The purpose is to determine which method is the fastest for a specific task: extracting a subset of characters from a longer string.

**Options Compared**

The test cases compare three options:

1. **Slice (`slice()`)**: Returns a new string containing the characters before the specified index.
2. **Substring (`substring()`) with an end index**: Returns a new string containing the characters between the start and end indices (exclusive).
3. **Substr (`substr()`) with two arguments**: Similar to `substring()` but uses two arguments: the start index and the length of the substring.

**Pros and Cons**

Here's a brief summary of each approach:

*   **Slice (`slice()`) Pros:** Returns a new string, can be more flexible when extracting a subset of characters. Cons: Creates a new object and may have performance implications due to the overhead of object creation.
*   **Substr (`substr()`) with two arguments**: A compromise between `slice()` and `substring()`. Pros: More efficient than `slice()` since it doesn't create a new string, but still has the flexibility of `substring()`. Cons: The syntax can be less intuitive for developers unfamiliar with this method.
*   **Substring (`substring()`) with an end index**: Returns a substring from the start index to the specified end index. Pros: More specific than `substr()` and `slice()` when working with Unicode characters or strings containing special characters. Cons: May have performance implications due to the overhead of character counting.

**Library and Special JS Features**

None are mentioned in this benchmark definition.

**Other Considerations**

When choosing between these methods, consider the following:

*   The specific use case and requirements.
*   Performance considerations (e.g., creating new objects or substrings).
*   Code readability and maintainability.
*   Browser support (all three methods are supported by modern browsers).

**Alternatives**

If you're looking for alternative string manipulation methods in JavaScript, consider the following:

1.  **RegExp**: Regular expressions can be used to extract patterns from strings, but may have performance implications due to the complexity of regular expression parsing.
2.  **String.prototype.replace() with a callback function**: Can be used to replace or transform substrings within a string.

To create this benchmark on MeasureThat.net, you would:

1.  Prepare your script by defining the test cases and variable assignments (like in the provided "Script Preparation Code").
2.  Set up the HTML page for displaying the results.
3.  Upload the prepared code to MeasureThat.net.
4.  Run the benchmark to compare the performance of `slice()`, `substr()`, and `substring()`.

Note that MeasureThat.net provides a user-friendly interface for creating and running JavaScript benchmarks, making it easy for developers to test their assumptions about string manipulation methods in JavaScript.

Related benchmarks:

slice vs substr vs substring (with end index 2) (version: 0)

Compares slice, substr and substring to each other

Comparing performance of: slice vs substr vs substring

Created: 3 years ago by: Registered User

Jump to the latest result

slice

substr

substring

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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