Benchmark: slice vs string substring vs substr on 10 chars

Script Preparation code:

var s1 = "0123456789";

Tests:

Array.split
var n1 = s1.slice(0, 6); var n2 = s1.slice(6);
Substring
var n1 = s1.substring(0, 6); var n2 = s1.substring(6, 10);
substr
var n1 = s1.substr(0, 6); var n2 = s1.substr(6, 10);

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Array.split
Substring
substr

Fastest: N/A

Slowest: N/A

Latest run results:

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark and explain what is being tested, compared, and considered.

**Benchmark Purpose**

The primary purpose of this benchmark is to compare the performance of three different string manipulation methods: `slice()`, `substring()`, and `substr()`. The benchmark is focused on a specific use case where a string of 10 characters is sliced into two parts.

**Options Compared**

Three options are being compared:

1. **`slice()`**: A method that returns a new string by extracting a section from the original string.
2. **`substring()`**: A method that returns a new string by extracting a section from the original string, with an optional starting index and length parameters.
3. **`substr()`**: A method (in older browsers) that returns a substring of the original string, with two arguments: start and length.

**Pros and Cons**

Here's a brief summary of each option:

* `slice()`: This method is generally considered the most efficient way to extract a section from a string. It creates a new string object and returns a reference to it. However, it can be slower than `substring()` if the start index or length parameters are large.
* `substring()`: This method is similar to `slice()`, but with an optional second argument for specifying the ending index. It's slightly faster than `slice()` when the end index is known.
* `substr()`: This method is an older alternative that returns a substring of the original string using two arguments: start and length. However, it has been deprecated in modern browsers and can be slower and less reliable than the other two options.

**Library Used**

There is no library used explicitly mentioned in the benchmark definition or test cases. However, it's likely that the `slice()`, `substring()`, and `substr()` methods are part of the JavaScript standard library.

**Special JS Feature/Syntax**

There isn't any special JavaScript feature or syntax being tested in this benchmark. The focus is solely on comparing different string manipulation methods.

**Other Considerations**

Some additional considerations when interpreting these results include:

* The device platform (Desktop) and operating system (Mac OS X 10.15.7) may affect the performance of each method.
* The number of executions per second can indicate the overall efficiency of each method, but it's essential to consider other factors like memory usage, garbage collection, and caching when interpreting these results.

**Alternatives**

If you're looking for alternatives to `slice()`, `substring()`, or `substr()`, some options include:

* Using a regular expression to extract a section from the string (e.g., using `RegExp.prototype.exec()`).
* Utilizing libraries like Lodash or Underscore.js, which provide more expressive and efficient string manipulation methods.
* Implementing custom string manipulation functions using bitwise operations or other low-level techniques.

Related benchmarks:

slice vs string substring vs substr on 10 chars (version: 0)

Comparing performance of: Array.split vs Substring vs substr

Created: 4 years ago by: Guest

Jump to the latest result

Array.split

Substring

substr

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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