Ruby: Multiply all elements of an array

Question

Let\'s say I have an array A = [1, 2, 3, 4, 5]

how can I multiply all elements with ruby and get the result? 1*2*3*4*5 = 120

and what if there is an element 0 ?

Answer 1

There is also another way to calculate this factorial! Should you want to, you can define whatever your last number is as n.

In this case, n=5.

From there, it would go something like this:

(1..num).inject(:*)

This will give you 120. Also, .reduce() works the same way.