Benchmark: isNumber: regex vs isNaN vs string comparison (version: 1)

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 (p >= '0' && p <= '9') {
      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)];
string comparison
gabage3 =+ case3[_.random(0, 1e3, false)];

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
isNaN
regex
string comparison

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 benchmark and explain what's being tested.

**Benchmark Overview**

The benchmark is designed to compare three approaches for checking if a value is a number:

1. `regex` (Regular Expression)
2. `string comparison`
3. `isNaN`

Each approach uses a proxy object (`window.case1`, `window.case2`, and `window.case3`) with a custom getter function that determines the truthiness of the value.

**Approach 1: regex**

* The `regex` approach uses a regular expression to check if the value is a number. The regex pattern `/^\\d+$/` matches any string that consists only of digits (`\d+`) from start to end (`^` and `$`).
* The getter function returns the converted value as a number using `+p`, assuming the input value can be parsed as an integer.
* Pros: Fast and efficient, especially for large numbers.
* Cons: May not work correctly for very large or very small numbers due to precision issues in JavaScript.

**Approach 2: string comparison**

* The `string comparison` approach uses a simple string comparison to check if the value is a number. It checks if the input value is greater than or equal to '0' (inclusive) and less than or equal to '9' (inclusive).
* The getter function returns the converted value as a number using `+p`.
* Pros: Simple and easy to understand, but may be slower for very large numbers.
* Cons: May not work correctly for very large or very small numbers due to precision issues in JavaScript.

**Approach 3: isNaN**

* The `isNaN` approach uses the built-in `isNaN()` function to check if the value is NaN (Not a Number).
* The getter function returns the converted value as a number using `+p`.
* Pros: Fast and efficient, especially for large numbers.
* Cons: May not work correctly for very large or very small numbers due to precision issues in JavaScript.

**Library**

The benchmark uses Lodash.js library, which provides the `_` variable used in the getter function. `_random()` is a utility function that generates a random number between 0 and 1e3 (inclusive).

**Special JS Feature/Syntax**

This benchmark does not use any special JavaScript features or syntax.

**Other Alternatives**

If you wanted to implement this benchmark from scratch, you could use a different approach, such as:

* Using `Number()` function to convert the value to a number.
* Using `BigInt()` function for large numbers.
* Implementing custom logic using bitwise operations or arithmetic manipulation.

However, it's worth noting that Lodash.js provides optimized and tested implementations of these functions, making them a good choice for performance-critical code.

Related benchmarks:

isNumber: regex vs isNaN vs string comparison (version: 1) (version: 0)

Comparing performance of: isNaN vs regex vs string comparison

Created: 4 years ago by: Guest

Jump to the latest result

isNaN

regex

string comparison

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):