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javascriptfactorial
AndrewL64
AndrewL64

Reputation: 16311

Are there any build-in methods in JavaScript for finding the factorial of a number?

Are there any build-in methods for finding the factorial of a number which we can use in place of reusable functions like the example below:

function factorial(x) {
  for (let i = x - 1; i >= 1; i--) {
    x= x * i; 
  }

  return x;
}

alert(factorial(16));

Upvotes: 1

Views: 2759

Answers (3)

mazunki
mazunki

Reputation: 732

There are no built-in functions to do the factorial of a number in JavaScript, but you could make a .js file just for this purpose, and import it in each file you intend to use it for.
Take a look at this question: How do I include a JavaScript file in another JavaScript file? for importing files. I believe this is the closest you can get for what you want.

As Nikos already mentioned in a comment, you should beware overflowing for large factorial numbers, as the highest number you can get to is 2^53 - 1 for integers, or 2^32-1 for bitwise operations. Make your own BigInt library, or search for one: there exist many open-source ones out there.

Upvotes: 0

Nikhil Aggarwal
Nikhil Aggarwal

Reputation: 28475

There is no in-build factorial function. However, as a side note, you can simplify your function as following

function factorial(x) {
  return (x > 1) ? x * factorial(x-1) : 1;
}

console.log(factorial(5));

Upvotes: 0

Bergi
Bergi

Reputation: 664936

No, the Math object does provide no such method.

Upvotes: 1

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