Benchmark: Javascript: Case insensitive string comparison performance 3

Script Preparation code:

var a = "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
var b = "lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
var c = "Sed ut perspiciatis unde omnis iste natus error sit voluptatem accusantium doloremque laudantium, totam rem aperiam, eaque ipsa quae ab illo inventore veritatis et quasi architecto beatae vitae dicta sunt explicabo. Nemo enim ipsam voluptatem quia voluptas sit aspernatur aut odit aut fugit, sed quia consequuntur magni dolores eos qui ratione voluptatem sequi nesciunt. Neque porro quisquam est, qui dolorem ipsum quia dolor sit amet, consectetur, adipisci velit, sed quia non numquam eius modi tempora incidunt ut labore et dolore magnam aliquam quaerat voluptatem. Ut enim ad minima veniam, quis nostrum exercitationem ullam corporis suscipit laboriosam, nisi ut aliquid ex ea commodi consequatur? Quis autem vel eum iure reprehenderit qui in ea voluptate velit esse quam nihil molestiae consequatur, vel illum qui dolorem eum fugiat quo voluptas nulla pariatur?"
var o = {
    sensitivity: 'base'
}

Tests:

toLowerCase()
a.toLowerCase() === b.toLowerCase()
localeCompare()
a.localeCompare(b,undefined,o)
toLowerCase() FAIL
c.toLowerCase() === b.toLowerCase()
localeCompare() FAIL
c.localeCompare(b,undefined,o)
toLocaleLowerCase()
a.toLocaleLowerCase() === b.toLocaleLowerCase()
toLocaleLowerCase() 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
toLocaleLowerCase()
toLocaleLowerCase() FAIL

Fastest: N/A

Slowest: N/A

Latest run results:

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

User agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_15_7) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/132.0.0.0 Safari/537.36

Browser/OS: Chrome 132 on Mac OS X 10.15.7

View result in a separate tab

Test name	Executions per second
toLowerCase()	6412489.0 Ops/sec
localeCompare()	147867.5 Ops/sec
toLowerCase() FAIL	3839289.2 Ops/sec
localeCompare() FAIL	192103.2 Ops/sec
toLocaleLowerCase()	3289451.8 Ops/sec
toLocaleLowerCase() FAIL	2468925.2 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 provided JSON and explain what's being tested.

**Benchmark Definition**

The benchmark definition is a JSON object that specifies how to create and execute a JavaScript microbenchmark. It includes:

* `Name`: A unique name for the benchmark.
* `Description`: An optional description of the benchmark.
* `Script Preparation Code`: A JavaScript code snippet that prepares the test data. In this case, it creates three string variables (`a`, `b`, and `c`) with similar but not identical text content.
* `Html Preparation Code`: An optional HTML code snippet that prepares the benchmark's execution environment (not used in this example).

**Individual Test Cases**

The individual test cases are an array of objects that specify how to create a specific test case. Each object includes:

* `Benchmark Definition`: A JavaScript expression that defines the test case, such as `a.toLowerCase() === b.toLowerCase()` or `c.localeCompare(b,undefined,o)`.
* `Test Name`: The name of the test case (e.g., "toLowerCase()" or "localeCompare() FAIL").

These test cases are designed to measure the performance of different JavaScript string comparison methods: `toLowerCase()`, `localeCompare()`, and `toLocaleLowerCase()`.

**Comparison Methods**

The three comparison methods being tested have different characteristics:

* `toLowerCase()`: This method converts both strings to lowercase using a case-insensitive algorithm. However, due to the similarity in text content between `a` and `b`, this test may be more about testing the performance of converting strings to lowercase rather than true string comparison.
* `localeCompare()`: This method compares two strings using a locale-dependent collation order. The `localeCompare()` method is designed for comparing strings based on their local culture, but in this case, it's being used with an empty locale (`undefined`) and options (`o`), which may not accurately reflect the intended usage.
* `toLocaleLowerCase()`: This method converts both strings to lowercase using a case-insensitive algorithm similar to `toLowerCase()` but also takes into account some nuances of Unicode text (e.g., handling special characters).

**Pros and Cons**

Here's a brief summary of the pros and cons of each comparison method:

* `toLowerCase()`: Pros: simple, fast; Cons: may not accurately compare strings due to similarity in text content.
* `localeCompare()`: Pros: accurate for locale-dependent comparisons; Cons: performance can be slow, especially with empty locales or options.
* `toLocaleLowerCase()`: Pros: more robust and accurate than `toLowerCase()` for Unicode text; Cons: slightly slower than `toLowerCase()`.

**Other Considerations**

When interpreting the benchmark results, consider the following factors:

* The test data is designed to elicit comparisons between strings that are not identical in all aspects.
* The `localeCompare()` method may perform differently depending on the locale and options used.
* The performance of each method can be influenced by factors such as JavaScript engine optimizations and platform-specific differences.

Overall, this benchmark provides a good starting point for evaluating the performance of different string comparison methods in JavaScript. However, it's essential to consider the nuances of each method and the test data when interpreting the results.

Related benchmarks:

Javascript: Case insensitive string comparison performance 3 (version: 0)

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

Created: one year ago by: Guest

Jump to the latest result

toLowerCase()

localeCompare()

toLowerCase() FAIL

localeCompare() FAIL

toLocaleLowerCase()

toLocaleLowerCase() 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):