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I'm going crazy: Where is the Ruby function for factorial? No, I don't need tutorial implementations, I just want the function from the library. It's not in Math!
I'm starting to doubt, is it a standard library function?
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The factorial of n is denoted by n! and calculated by multiplying the integer numbers from 1 to n. The formula for n factorial is n! = n × (n - 1)!.
A recursive function is a nonleaf function that calls itself. The factorial function can be written as a recursive function call. Recall that factorial(n) = n × (n – 1) × (n – 2) × … × 2 × 1. The factorial function can be rewritten recursively as factorial(n) = n × factorial(n – 1).
There is no factorial function in the standard library.
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Like this is better
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