Class: Integer

Inherits:

Object

• Object
• Integer

Defined in:

lib/darkext/integer.rb

Instance Method Summary

• #fact ⇒ Object

  Computes the factorial of the Integer.

Instance Method Details

#fact ⇒ Object

Computes the factorial of the Integer

Raises:

• (ArgumentError)

# File 'lib/darkext/integer.rb', line 5

def fact
  raise ArgumentError.new('Cannot compute factorial of negative number') if 0 > self
  return 1 if self.zero?
  return (1..self).to_a.product
end