Benchmark: Javascript: Case insensitive string comparison performance lowerLocale

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.toLocaleLowerCase() === b.toLocaleLowerCase();
toLowerCase() FAIL
c.toLowerCase() === b.toLowerCase()
localeCompare() FAIL
c.toLocaleLowerCase() === b.toLocaleLowerCase();

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: 2 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/131.0.0.0 Safari/537.36

Browser/OS: Chrome 131 on Windows

View result in a separate tab

Test name	Executions per second
toLowerCase()	27272296.0 Ops/sec
localeCompare()	15174823.0 Ops/sec
toLowerCase() FAIL	16496865.0 Ops/sec
localeCompare() FAIL	15259376.0 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

Let's break down the benchmark and its options.

**Benchmark Definition:**
The benchmark is focused on testing the performance of two string comparison functions in JavaScript:

1. `toLowerCase()`
2. `localeCompare()`

These functions are used to compare strings, but they differ in their approach:

* `toLowerCase()` converts both input strings to lowercase using the ASCII character set.
* `localeCompare()` compares two strings based on the locale settings of the user's environment.

**Options Compared:**
The benchmark compares the performance of two options:

1. Using `toLowerCase()` for case-insensitive string comparison
2. Using `localeCompare()` for case-insensitive string comparison

**Pros and Cons of Each Approach:**

### 1. `toLowerCase()`

Pros:

* Wide support across different browsers and environments
* Simple implementation

Cons:

* Can be slower than other approaches, especially for large strings or complex locales
* May not handle non-ASCII characters correctly

### 2. `localeCompare()` (with fallback to ASCII)

Pros:

* Handles non-ASCII characters and case differences based on locale settings
* Can provide better performance than `toLowerCase()` in some cases

Cons:

* Requires support for locale comparison, which may not be available in all browsers or environments
* May be slower than other approaches due to the complexity of locale comparisons

**Library Used:**
There is no explicit library mentioned in the benchmark definition. However, it's worth noting that `localeCompare()` uses the International Organization for Standardization (ISO) 4064 and Unicode standard (Unicode 6.3) definitions for locale comparison.

**Special JS Features/Syntax:**
None of the test cases use special JavaScript features or syntax beyond the built-in string comparison functions.

**Other Alternatives:**
If you were to optimize this benchmark further, you could consider using other approaches, such as:

1. Using a custom implementation of case-insensitive string comparison that's optimized for performance
2. Using a library like ICU (International Components for Unicode) for locale-aware string comparisons
3. Using regular expressions or other string manipulation techniques to achieve case-insensitive matching

Keep in mind that these alternatives may require more development effort and resources, but can potentially provide better performance or more accurate results.

In summary, the benchmark compares the performance of two common string comparison functions in JavaScript: `toLowerCase()` and `localeCompare()`. The choice of which function to use depends on your specific requirements for case-insensitive matching, with `localeCompare()` offering better support for non-ASCII characters but potentially slower performance.

Related benchmarks:

Javascript: Case insensitive string comparison performance lowerLocale (version: 0)

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

Created: 3 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 6 months ago):