# Factorials In Javascript (With Recursion)

To learn JavaScipt, I’m redoing some problems I’ve done to learn Ruby. Previously, I wrote a Ruby method to find a factorial of a number both recursively and non-recursively. You can read the original post here.

This is how you solve the same problem with Javascript:

## Non-Recursively

```//prompt user to enter a number to calculate the factorial
var num = prompt(&quot;What number do you want to find the factorial of?&quot;)

var factorial = function(n) {
if(n == 0) {
return 1
} else {
product = 1;
for(i = 1; i &lt;= n; i++) {
product *= i;
}
return product;
}
}

console.log(factorial(num));

```

## Recursively

```//prompt user to enter a number to calculate the factorial
var num = prompt(&quot;What number do you want to find the factorial of?&quot;)

//recursive
var factorial = function(n) {
if(n == 0) {
return 1
} else {
return n * factorial(n - 1);
}
}

console.log(factorial(num));
```

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• I found a site to learn JavaScript, I got stuck there cause of their point-system. Collecting points is my weakness! haha

• Haha… I was playing on there yesterday myself. The only issue I had was that some of the lessons weren’t well thought out. There doesn’t seem to be much quality control.

• Yea I noticed that too.

But overall I think that its fun that they have a site with training javascript, html, css and jquery 🙂

• If n is not an integer, you get infinite recursion.

• Cool! Thanks for letting me know.

• Landon Sanders

wow!

• Landon Sanders

wow!

• Vaibhav Pal

You simply can use Number(n) where ever n is present