Benchmark: regex vs isInteger

Script Preparation code:

window.case1 = new Proxy({}, {
  get(t, p, r) {
    if (Number.isInteger(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.garbage1 = 0;
window.garbage2 = 0;

Tests:

isInteger
for (let i = 0; i < 1e6;i++) { garbage1 =+ case1[i]; }
regex
for (let i = 0; i < 1e6;i++) { garbage2 += case2[i]; }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
isInteger
regex

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 10 months ago)

User agent: Mozilla/5.0 (X11; Linux x86_64; rv:139.0) Gecko/20100101 Firefox/139.0

Browser/OS: Firefox 139 on Linux

View result in a separate tab

Test name	Executions per second
isInteger	31.6 Ops/sec
regex	24.4 Ops/sec

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

LLMs can make mistakes. Check important info.

Let's break down the provided benchmarking test cases.

**Benchmark Definition**

The provided JSON represents a JavaScript microbenchmark that compares two approaches: using `Number.isInteger()` and using a regular expression (`/^\\d+$/.test(p)`).

**Options Compared**

Two options are compared:

1. **`Number.isInteger()`**: This is a built-in JavaScript method that checks if a value is an integer.
2. **Regular Expression (`/^\\d+$/.test(p)`)**: This uses a regular expression to check if a string consists entirely of digits.

**Pros and Cons**

**`Number.isInteger()`**

Pros:

* Fast and efficient, as it's implemented in native code.
* Easy to read and understand.
* Works well for most integer values.

Cons:

* May not work correctly with non-integer numeric values (e.g., `NaN`, `-0.1`, etc.).
* Limited control over the checking process.

**Regular Expression (`/^\\d+$/.test(p)`)**

Pros:

* More flexible than `Number.isInteger()`, as it can handle non-integer numeric values.
* Allows for more control over the checking process, including the possibility of using other patterns.

Cons:

* Slower and less efficient than `Number.isInteger()`.
* More complex to read and understand.

**Library Used**

Neither option uses a dedicated library. However, both methods utilize built-in JavaScript functionality, which is often sufficient for microbenchmarking purposes.

**Special JS Feature/Syntax**

The benchmark does not use any special JavaScript features or syntax that would require additional explanation. The focus is on comparing the performance of two fundamental approaches to checking integer values.

**Alternatives**

Other alternatives for checking if a value is an integer could include:

1. Using `typeof` with the `number` type: `if (typeof x === 'number' && Number.isInteger(x)) { ... }`
2. Using a utility library like `mathjs` or `int` to perform the check.
3. Implementing a custom function for checking integers.

However, it's worth noting that these alternatives may not be as efficient or straightforward as using built-in JavaScript methods like `Number.isInteger()` and regular expressions.

Related benchmarks:

regex vs isInteger (version: 0)

Comparing performance of: isInteger vs regex

Created: 2 years ago by: Guest

Jump to the latest result

isInteger

regex

Suite status: <idle, ready to run>

Fastest: N/A

Slowest: N/A

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