Benchmark: testquery - MeasureThat.net

HTML Preparation code:

var string = "isAlphaNumeric2021"

Script Preparation code:

var string = "isAlphaNumeric2021"

Tests:

Regex
/^[a-z0-9]+$/i.test(string)
charCodeAt
function isAlphaNumeric(str) { for (let i = 0; i < str.length; i++) { let code = str.charCodeAt(i) if (!(code > 47 && code < 58) && // numeric (0-9) !(code > 64 && code < 91) && // upper alpha (A-Z) !(code > 96 && code < 123)) { // lower alpha (a-z) return false } } return true } isAlphaNumeric(string)

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Regex
charCodeAt

Fastest: N/A

Slowest: N/A

Latest run results:

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

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Let's dive into the provided benchmark and explain what's being tested.

**Benchmark Definition**

The benchmark is defined by two scripts: `Script Preparation Code` and `Html Preparation Code`. These scripts are executed to prepare the input string for the test cases. In this case, both scripts assign the same value to a variable named `string`, which contains the regular expression `/isAlphaNumeric2021/i/`.

**Test Cases**

There are two test cases:

1. **Regex**: This test case uses the built-in `test()` method of the string object in JavaScript, specifically the regular expression `/^[a-z0-9]+$/i`. The `^` character indicates the start of the string, `[a-z0-9]` matches any alphanumeric character, and `+` means one or more occurrences. The `/i` flag at the end makes the match case-insensitive.
2. **charCodeAt**: This test case defines a custom function `isAlphaNumeric()` that checks if each character in the input string is an alphanumeric character (0-9, A-Z, or a-z). The function uses the `charCodeAt()` method to get the Unicode code point of each character.

**Options Compared**

In this benchmark, we have two options:

1. **Built-in String Methods**: Using built-in methods like `test()` and `charCodeAt()` is a straightforward approach.
2. **Custom Implementation**: Implementing a custom function `isAlphaNumeric()` to check if characters are alphanumeric.

**Pros and Cons**

* **Built-in String Methods**: Pros:
	+ Fast execution speed (no overhead of function calls)
	+ Low memory usage
	+ Easy to implement and understand
Cons:
	+ Limited control over the matching process
	+ May not work as expected for certain edge cases or Unicode characters
* **Custom Implementation**: Pros:
	+ More control over the matching process
	+ Can handle edge cases and Unicode characters more effectively
Cons:
	+ Slower execution speed (due to function calls)
	+ Higher memory usage
	+ Requires more code and maintenance

**Library**

There is no explicit library used in this benchmark. The built-in `test()` method and custom implementation are self-contained.

**Special JS Feature or Syntax**

There are no special JavaScript features or syntax used in this benchmark. It's a straightforward, vanilla JavaScript implementation.

**Other Alternatives**

If you want to test different approaches, here are some alternatives:

1. **Use a regex engine**: Implementing a full-fledged regex engine would provide more control over the matching process.
2. **Use a string processing library**: Libraries like ICU or UnicodeNormalizer could be used to improve performance and handling of edge cases.
3. **Use a Just-In-Time (JIT) compiler**: Using a JIT compiler like V8 in Chrome would provide optimized execution speed.

Keep in mind that these alternatives might not be as straightforward to implement and understand, especially for developers without experience with regex engines or string processing libraries.

Related benchmarks:

testquery (version: 0)

Comparing performance of: Regex vs charCodeAt

Created: 4 years ago by: Registered User

Jump to the latest result

Regex

charCodeAt

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):