Benchmark: Javascript: Case insensitive string comparison performance with localeCompare call updated to specify locale.

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

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/109.0.0.0 Safari/537.36

Browser/OS: Chrome 109 on Windows

View result in a separate tab

Test name	Executions per second
toLowerCase()	24377662.0 Ops/sec
localeCompare()	69610.7 Ops/sec
toLowerCase() FAIL	10764888.0 Ops/sec
localeCompare() FAIL	73316.6 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's dive into the JavaScript microbenchmark on MeasureThat.net.

**Benchmark Description:**

The benchmark tests the performance of two string comparison methods in JavaScript:

1. `toLowerCase()` (case-insensitive comparison)
2. `localeCompare()` with locale and sensitivity settings (base sensitivity)

The benchmark defines three test cases:

* `toLowerCase()`: comparing two strings using `toLowerCase()` method
* `localeCompare()`: comparing two strings using `localeCompare()` method with locale set to English (`'en'`) and base sensitivity

**Options Compared:**

The benchmark compares the performance of `toLowerCase()` vs. `localeCompare()` with different settings.

Pros and Cons:

* **`toLowerCase()`:**
	+ Pros:
		- Simple, widely supported method
		- Fast execution time
	+ Cons:
		- Case-sensitive comparison (may not work as expected for international strings)
		- May be less accurate than `localeCompare()` for comparing strings with different locales
* **`localeCompare()`:**
	+ Pros:
		- Provides a more accurate and case-insensitive comparison, especially for international strings
		- Allows for customization of locale and sensitivity settings
	+ Cons:
		- Requires support for the `Intl.Locale` API, which may not be available in all browsers or environments
		- May have higher execution time compared to `toLowerCase()`

**Library:**

The benchmark uses no external libraries.

**Special JS Features/Syntax:**

No special JavaScript features or syntax are used in this benchmark. However, it does use the `Intl.Locale` API for the `localeCompare()` method, which is a modern feature introduced in ECMAScript 2015 (ES6).

**Other Alternatives:**

If you need to compare strings using a different approach, you may consider:

* Using a regular expression with a case-insensitive flag (`i`) or using the `String.prototype.localeCompare()` method (not available in older browsers)
* Implementing your own custom comparison function using string manipulation and case folding techniques
* Using a third-party library that provides a more robust string comparison API, such as ICU (International Components for Unicode)

Keep in mind that these alternatives may have varying degrees of compatibility with different browsers and environments.

Related benchmarks:

Javascript: Case insensitive string comparison performance with localeCompare call updated to specify locale. (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>

Fastest: N/A

Slowest: N/A

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