Benchmark: isnan regex and typeof

HTML Preparation code:

<script src='https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.17.5/lodash.min.js'></script>

Script Preparation code:

window.case1 = new Proxy({}, {
  get(t, p, r) {
    if (typeof p === 'string' && !isNaN(p)) {
      return +p
    }
    else {
      return Reflect.get(t, p, r)
    }
  }
});
window.case2 = new Proxy({}, {
  get(t, p, r) {
    if (/^\d+$/.test(p)) {
      return +p
    }
    else {
      return Reflect.get(t, p, r)
    }
  }
});
window.case3 = new Proxy({}, {
  get(t, p, r) {
    if (typeof v === 'number' && isFinite(v)) {
      return +p
    }
    else {
      return Reflect.get(t, p, r)
    }
  }
});
window.gabage1 = 0;
window.gabage2 = 0;
window.gabage3 = 0;

Tests:

isnan
gabage1 =+ case1[_.random(0, 1e3, false)];
regex
gabage2 =+ case2[_.random(0, 1e3, false)];
typeof
gabage3 =+ case3[_.random(0, 1e3, false)];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
isnan
regex
typeof

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 break down the provided benchmark definition and test cases.

**What is being tested?**

The benchmark tests three different approaches to check if a value is NaN (Not a Number):

1. `isnan` (using `case1`)
2. Regular expression (`regex`) (using `case2`)
3. `typeof` with `isFinite` check (`case3`)

**Options compared:**

*   **isNaN**: This is the built-in JavaScript function used to determine whether a given value is NaN.
*   **Regular Expression (`regex`)**: A regular expression `/^\\d+$/.test(p)` is used to match numeric values. If the test case passes, it means the string can be converted to an integer or float.
*   **typeof + isFinite**: This approach uses `typeof v` to check if a value is a number and then applies the `isFinite` function to ensure it's not NaN.

**Pros and Cons of each approach:**

1.  **isNaN**: Pros:
    *   Built-in JavaScript function, making it easy to use.
    *   Fast execution speed due to native implementation.
2    Cons:
    *   May not cover all edge cases (e.g., checking for NaN across different data types).
*   **Regular Expression (`regex`)**: Pros:
    *   Can be used to check for specific patterns, such as numeric strings.
    *   Allows for more control over the validation process.
*    Cons:
    *   May have performance overhead due to regex engine execution.
    *   Less intuitive than using built-in `isNaN`.
*   **typeof + isFinite**: Pros:
    *   Provides a clear indication of whether the value is a number without relying on built-in functions.
    *   Can be used to check for NaN across different data types.

Cons:

*   May have performance overhead due to type checking and function calls.

**Library used:**

The `lodash` library is imported using `window._ = require('lodash');`, but it's not explicitly used in the benchmark definition. However, it might be used indirectly through other libraries or external scripts.

**Special JS feature/syntax:**

*   **Proxy**: The `Proxy` object is used to create a new proxy object (`case1`, `case2`, and `case3`). A proxy allows you to control access to an object's properties by providing a handler function that determines how the property should be accessed.
*   **Reflect.get** : This method retrieves the value of a given property from a target object.

**Alternative approaches:**

Other alternatives could include:

1.  **Using `Number.isNaN`**: Instead of using `isNaN`, you can use `Number.isNaN` (or the `NaN` literal) to check if a value is NaN.
2.  **Regular expressions with `Number()`**: You can use regular expressions to match numeric values and then convert them to numbers using `Number()`.
3.  **Type checking libraries**: There are other type checking libraries available, such as TypeScript or TypeScript-like tools like Flow.

These alternatives might provide different performance characteristics, ease of use, or specific features that cater to your needs better than the benchmarked approaches.

Related benchmarks:

isnan regex and typeof (version: 0)

Comparing performance of: isnan vs regex vs typeof

Created: 6 years ago by: Guest

Jump to the latest result

isnan

regex

typeof

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):