Benchmark: Case insensitive string comparison performance

Script Preparation code:

var u = {
  get a(){
    return "John Doe"
  },
  get b(){
    return "john doe"
  },
  get c(){
    return "john smith"
  }
}

Tests:

toLowerCase() a===b
u.a.toLowerCase() === u.b.toLowerCase()
localeCompare() a===b
u.a.localeCompare(u.b, undefined, { sensitivity: 'base' })
toLowerCase() c===b
u.c.toLowerCase() === u.b.toLowerCase()
localeCompare() c===b
u.c.localeCompare(u.b, undefined, { sensitivity: 'base' })

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
toLowerCase() a===b
localeCompare() a===b
toLowerCase() c===b
localeCompare() c===b

Fastest: N/A

Slowest: N/A

Latest run results:

No previous run results

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

LLMs can make mistakes. Check important info.

Let's dive into the world of JavaScript microbenchmarks on MeasureThat.net.

**Benchmark Definition and Purpose**

The benchmark definition is a JSON object that describes the test case. In this case, it represents a comparison between two strings: `u.a` and `u.b`. The purpose of the benchmark is to measure the performance of different string comparison methods.

There are three options compared:

1. `toLowerCase()`: This method converts both strings to lowercase before comparing them.
2. `localeCompare()` with sensitivity set to `'base'`: This method compares the strings using a base case, which means it ignores any differences in case and non-ASCII characters.

**Pros and Cons**

Here's a brief summary of each option:

1. **toLowerCase()**:
	* Pros: Simple, widely supported, and easy to implement.
	* Cons: May lose precision when dealing with non-ASCII characters or special cases (e.g., accented characters).
2. **localeCompare()` with sensitivity set to `'base'`:
	* Pros: Handles non-ASCII characters and special cases correctly, provides a more accurate comparison.
	* Cons: More complex and less widely supported than `toLowerCase()`, may be slower due to the additional processing required.

**Library**

In this benchmark, the library being used is not explicitly mentioned. However, the `localeCompare()` method is part of the ECMAScript standard (ES6) and is widely implemented across modern browsers and Node.js environments.

**Special JS Feature or Syntax**

There are no special JavaScript features or syntaxes being tested in this benchmark. The code simply uses JavaScript objects and methods to define the test case.

**Alternative Approaches**

Other approaches to string comparison could include:

1. **Using regular expressions**: This can provide a high degree of accuracy, but may be slower than `toLowerCase()` and `localeCompare()`.
2. **Using Unicode normalization**: This method normalizes both strings to a standard form before comparing them, which can help ensure accurate results when dealing with non-ASCII characters.
3. **Implementing custom string comparison logic**: Depending on the specific requirements of your use case, you may need to implement custom string comparison logic that takes into account factors like cultural sensitivity or special cases.

Overall, this benchmark provides a useful starting point for comparing the performance of different string comparison methods in JavaScript.

Related benchmarks:

Case insensitive string comparison performance (version: 1)

Comparing performance of: toLowerCase() a===b vs localeCompare() a===b vs toLowerCase() c===b vs localeCompare() c===b

Created: 3 years ago by: Registered User

Jump to the latest result

toLowerCase() a===b

localeCompare() a===b

toLowerCase() c===b

localeCompare() c===b

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

No previous run results

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