Benchmark: includes + toLocaleLowerCase vs RegExp + i

Script Preparation code:

var str = "This is a simple test!";
var needle = "sImPle";
var needleLower = "simple";

Tests:

lowercase + includes
str.toLowerCase().includes(needleLower)
RegExp + i
new RegExp(needle, 'i').test(str);
localelowercase + includes
str.toLocaleLowerCase().includes(needleLower)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
lowercase + includes
RegExp + i
localelowercase + includes

Fastest: N/A

Slowest: N/A

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/114.0.0.0 Safari/537.36

Browser/OS: Chrome 114 on Windows

View result in a separate tab

Test name	Executions per second
lowercase + includes	12032943.0 Ops/sec
RegExp + i	4774519.0 Ops/sec
localelowercase + includes	10935939.0 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and test cases to understand what is being tested.

**Benchmark Definition JSON**

The benchmark definition contains three key pieces of information:

1. **Script Preparation Code**: This code is used to prepare the JavaScript script for execution. In this case, it defines three variables: `str`, `needle`, and `needleLower`. The string `str` is set to "This is a simple test!" and the two strings `needle` and `needleLower` are set to "sImPle" and "simple", respectively.
2. **Html Preparation Code**: This code is not used in this benchmark definition, so it's empty.
3. **Benchmark Name**: The name of the benchmark is "includes + toLocaleLowerCase vs RegExp + i".

**Test Cases**

The test cases are designed to compare the performance of three different approaches:

1. **lowercase + includes**
2. **RegExp + i**
3. **localeLowercase + includes**

Each test case has a unique **Benchmark Definition**, which is a JavaScript expression that evaluates to either `true` or `false`. The expressions are:

1. `str.toLowerCase().includes(needleLower)`
2. `new RegExp(needle, 'i').test(str)`
3. `str.toLocaleLowerCase().includes(needleLower)`

These expressions test whether the string `str` contains the lowercase version of `needle`.

**Library and Special Features**

The test cases use two libraries:

1. **`toLocaleLowerCase()`**: This is a JavaScript method introduced in ECMAScript 2017 (ES7). It converts a string to its local form, which means it adjusts the case based on the locale settings.
2. **`RegExp`**: The `RegExp` object is used to create a regular expression pattern that can be matched against strings.

**Options Compared**

The test cases compare three options:

1. Using the `toLowerCase()` method to convert the string to lowercase before checking if it contains the target string.
2. Using the `toLocaleLowerCase()` method to convert the string to its local form, which may adjust the case based on locale settings.
3. Using a regular expression (`RegExp`) with the `i` flag (case-insensitive) to match against the string.

**Pros and Cons**

Here are some pros and cons of each approach:

1. **`toLowerCase()`**: Pros:
	* Simple and widely supported.
	* Fast and efficient.
	* No locale settings needed.
Cons:
	* May not work correctly with non-ASCII characters or certain locale settings.
2. **`toLocaleLowerCase()`**: Pros:
	* Can handle non-ASCII characters and locale settings correctly.
Cons:
	* May be slower due to the additional processing step.
3. **`RegExp + i`**: Pros:
	* Fast and efficient for matching against strings.
	* No locale settings needed.
Cons:
	* Requires regular expressions, which can be complex and error-prone.

**Alternatives**

If you don't want to use JavaScript or prefer a different programming language, here are some alternatives:

1. **Python**: You can use Python's `re` module to perform regular expression matching.
2. **C++**: You can use C++'s `std::string` class and regular expressions (e.g., Boost) to match against strings.
3. **Other languages**: Depending on your specific requirements, you might consider using other programming languages that have built-in support for string matching or locale settings.

I hope this explanation helps you understand the benchmark definition and test cases!

Related benchmarks:

includes + toLocaleLowerCase vs RegExp + i (version: 0)

Comparing performance of: lowercase + includes vs RegExp + i vs localelowercase + includes

Created: one year ago by: Guest

Jump to the latest result

lowercase + includes

RegExp + i

localelowercase + includes

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):