Benchmark: slice vs substr vs substring new

Script Preparation code:

var code = 'MBDT2RE';

Tests:

Slice
var result = code.slice(0, 6);
SubStr
var result = code.substr(0, 6);
SubString
var result = code.substring(0, 6);

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

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

LLMs can make mistakes. Check important info.

**Overview of the Benchmark**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided JSON represents a benchmark definition for testing three different string manipulation methods: `slice`, `substr`, and `substring`. The purpose of this benchmark is to compare the performance of these methods in slicing or extracting a substring from a given string.

**What is being tested?**

The test cases are designed to measure the execution time of each method on a specific input string, which is defined by the `code` variable. In this case, the code is set to `'MBDT2RE'`.

Here's what's being compared:

*   **`slice()`**: Extracts a specified number of characters from the beginning of the string.
*   **`substr()`** (note: some browsers support a non-standard method called `substring()`, but it seems that Chrome 115 uses the standard method): Extracts a specified number of characters from the beginning of the string.
*   **`substring()`**: Similar to `slice()`, but with optional start and end indices.

These methods differ in their behavior when the start index is greater than the length of the string. `slice()` returns an empty string, while `substr()` throws a TypeError in older browsers (although this has been fixed in modern browsers). `substring()` returns an empty string if the start index is greater than the length of the string.

**Pros and Cons**

Here's a brief overview of each method's pros and cons:

*   **`slice()`**:
    *   Pros: Fast, efficient, and widely supported.
    *   Cons: Returns an empty string when the start index exceeds the string length.
*   **`substr()`**: (Non-standard in modern browsers)
    *   Pros: Similar to `slice()`, but may be faster due to its native implementation.
    *   Cons: Throws a TypeError if the start index is greater than the length of the string (though this has been fixed).
*   **`substring()`**:
    *   Pros: Handles cases where the start index exceeds the string length by returning an empty string.
    *   Cons: May be slower due to its more complex implementation.

**Library Usage**

None of these methods rely on external libraries. The `substring()` method is a standard JavaScript method, while `slice()` and `substr()` are also part of the JavaScript language specification.

**Special JS Features or Syntax**

This benchmark doesn't use any special JavaScript features or syntax beyond what's described above. It's focused on comparing the performance of these three string manipulation methods.

**Other Alternatives**

Some alternative approaches to this benchmark could include:

*   Using a more comprehensive test suite that includes edge cases, such as extracting substrings from strings with non-ASCII characters or null values.
*   Comparing the performance of other string manipulation methods, like `indexOf()`, `lastIndexOf()`, or regular expressions.
*   Adding more browser versions and platforms to ensure wider coverage.

Keep in mind that MeasureThat.net is primarily a tool for comparing JavaScript engine performance, so these alternative approaches might not be directly relevant.

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/115.0.0.0 Safari/537.36 Edg/115.0.1901.188

Browser/OS: Chrome 115 on Windows

View result in a separate tab

Test name	Executions per second
Slice	11725117.0 Ops/sec
SubStr	9801595.0 Ops/sec
SubString	7448373.5 Ops/sec

Related benchmarks:

slice vs substr vs substring new (version: 0)

..

Comparing performance of: Slice vs SubStr vs SubString

Created: 2 years ago by: Guest

Jump to the latest result

Slice

SubStr

SubString

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

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