Benchmark: Checking if number is integer

Script Preparation code:

var numbers = [];
for(let i = 0; i < 100000;i++)
{
	numbers.push(Math.random()*100000);
	numbers.push(Math.floor(Math.random()*100000));
}
numbers.sort( (a,b) => (0.5)-Math.random());

Tests:

Modulus 1
let integerCount = 0; for(let i = 0; i < numbers.length;i++) { if(!(numbers[i]%1)) { integerCount+=1; } }
Number.isInteger
let integerCount = 0; for(let i = 0; i < numbers.length;i++) { if(Number.isInteger(numbers[i])) { integerCount+=1; } }

Rendered benchmark preparation results:

Suite status: <idle, ready to run>

Previous results

Test case name	Result
Modulus 1
Number.isInteger

Fastest: N/A

Slowest: N/A

Latest run results:

Run details: (Test run date: 2 months ago)

User agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/133.0.0.0 Safari/537.36

Browser/OS: Chrome 133 on Windows

View result in a separate tab

Test name	Executions per second
Modulus 1	288.9 Ops/sec
Number.isInteger	407.7 Ops/sec

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):

LLMs can make mistakes. Check important info.

Let's break down the provided benchmark definition and explain what's being tested.

**Benchmark Definition:**

The benchmark measures the performance of two approaches to check if a number is an integer:

1. Using the modulo operator (`%`) to check if the remainder of the division by 1 is zero.
2. Using the `Number.isInteger()` method, which returns `true` for integers and `false` otherwise.

**Script Preparation Code:**

The script generates two arrays of random numbers with a range of 0 to 100,000. The arrays are then sorted randomly using the `sort()` method with a custom comparison function.

**Html Preparation Code:**

There is no HTML preparation code provided for this benchmark.

**Individual Test Cases:**

There are two test cases:

1. "Modulus 1": This test case uses a simple loop to iterate through the generated numbers and checks if each number modulo 1 is zero.
2. "Number.isInteger": This test case also uses a loop to iterate through the generated numbers, but this time it uses the `Number.isInteger()` method to check if each number is an integer.

**Library:**

There are no external libraries used in these test cases, apart from the built-in JavaScript methods (`Math.random()`, `Math.floor()`, and `sort()`).

**Special JS Feature or Syntax:**

The only special feature used in these test cases is the custom comparison function passed to the `sort()` method. However, this is a standard JavaScript syntax and not specific to any particular library or module.

Now, let's discuss the pros and cons of each approach:

**Modulus 1:**

Pros:

* This approach is simple and easy to understand.
* It doesn't require the use of any external libraries or methods.

Cons:

* It may be slower than other approaches due to the modulo operation being performed on each number, which can be costly for large numbers.
* It's not as concise or expressive as using `Number.isInteger()`.

**Number.isInteger:**

Pros:

* This approach is more concise and expressive than the modulus-based approach.
* It's likely to be faster since it avoids the modulo operation and uses a specialized method designed for this purpose.

Cons:

* It may not work as expected for very large numbers due to numerical precision issues (e.g., `Number.isInteger(Infinity)` returns `false`).
* It requires the use of an external library or module (in this case, the built-in JavaScript standard library).

**Other Alternatives:**

If you wanted to avoid using the `Number.isInteger()` method, you could implement your own integer check using bitwise operations, such as:

```javascript
function isInteger(n) {
  return n === Math.floor(n);
}
```

Alternatively, you could use a library like `big-integer` or `decimal.js` to perform arithmetic operations on integers and avoid numerical precision issues.

Related benchmarks:

Checking if number is integer (version: 0)

Compares using num % 1 to number.isInteger

Comparing performance of: Modulus 1 vs Number.isInteger

Created: 2 years ago by: Guest

Jump to the latest result

Modulus 1

Number.isInteger

Suite status: <idle, ready to run>

Experimental features:

Fastest: N/A

Slowest: N/A

Autogenerated LLM Summary (model llama3.2:3b, generated 6 months ago):