Benchmark: Javascript: Case insensitive string comparison performance en-US

Script Preparation code:

var a = "John Doe"
var b = "john doe"
var c = "john smith"
var o = {
    sensitivity: 'base'
}

Tests:

toLowerCase()
a.toLowerCase() === b.toLowerCase()
localeCompare()
a.localeCompare(b, 'en-US', o)
toLowerCase() FAIL
c.toLowerCase() === b.toLowerCase()
localeCompare() FAIL
c.localeCompare(b, 'en-US' ,o)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
toLowerCase()
localeCompare()
toLowerCase() FAIL
localeCompare() FAIL

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):

LLMs can make mistakes. Check important info.

**Benchmark Overview**

MeasureThat.net is a website that allows users to create and run JavaScript microbenchmarks. The provided benchmark measures the performance of two string comparison methods: `toLowerCase()` and `localeCompare()`. The test cases are designed to evaluate the performance of these methods on case-insensitive strings.

**Options Compared**

The benchmark compares the following options:

1. **`toLowerCase()`**: This method converts a string to lowercase by converting each character to its lowercase equivalent.
2. **`localeCompare(b, 'en-US', o)`**: This method compares two strings using the locale and sensitivity settings provided in the `o` object.

**Pros and Cons of Each Approach**

1. **`toLowerCase()`**:
	* Pros: Simple and straightforward implementation, widely supported by browsers.
	* Cons: May not work correctly for non-English characters or special cases like accented letters.
2. **`localeCompare(b, 'en-US', o)`**:
	* Pros: Can handle case-insensitive comparisons and is locale-aware, making it more accurate than `toLowerCase()` for certain use cases.
	* Cons: More complex implementation, may be slower due to the additional locale and sensitivity checks.

**Library and Purpose**

In this benchmark, the `locale` library is used implicitly by the `localeCompare()` method. The `locale` library provides a way to specify the locale and sensitivity settings for string comparisons, allowing for more accurate and culturally aware results.

**Special JavaScript Features or Syntax**

The benchmark uses the following special JavaScript feature:

* **Locale-aware strings**: The `localeCompare()` method uses locale-aware strings, which take into account the cultural conventions of different regions. This allows for more accurate comparisons between strings written in different languages.
* **Sensitivity settings**: The `o` object provides sensitivity settings that can be used to customize the comparison behavior.

**Other Considerations**

When choosing between `toLowerCase()` and `localeCompare()`, consider the following:

* If you need to compare strings in a case-insensitive manner, but still want to account for cultural differences, use `localeCompare()`.
* If you only need a simple case-insensitive conversion, use `toLowerCase()`.
* Be aware that `localeCompare()` may be slower than `toLowerCase()` due to the additional locale and sensitivity checks.

**Alternative Options**

If you're not satisfied with the results of this benchmark or want to explore alternative options, consider the following:

* **Use a different string comparison method**, such as using regular expressions or implementing your own custom comparison function.
* **Test on different browsers or devices**: MeasureThat.net's benchmark is run on Chrome 103, but you may want to test on other browsers or devices to see how they perform.
* **Optimize the benchmark code**: If you're interested in optimizing the benchmark code for better performance, consider using techniques like caching or memoization.

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/103.0.0.0 Safari/537.36

Browser/OS: Chrome 103 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
toLowerCase()	6293101.5 Ops/sec
localeCompare()	103033.1 Ops/sec
toLowerCase() FAIL	5871233.0 Ops/sec
localeCompare() FAIL	103574.3 Ops/sec

Related benchmarks:

Javascript: Case insensitive string comparison performance en-US (version: 0)

Comparing performance of: toLowerCase() vs localeCompare() vs toLowerCase() FAIL vs localeCompare() FAIL

Created: 2 years ago by: Guest

Jump to the latest result

toLowerCase()

localeCompare()

toLowerCase() FAIL

localeCompare() FAIL

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 27 days ago):