Class: Integer

Inherits:
Object
  • Object
show all
Defined in:
lib/viral_seq/math.rb

Overview

additional functions for Class::Integer

Instance Method Summary collapse

Instance Method Details

#! ⇒ Integer

factorial method for an Integer

Examples:

factorial for 5

!5
=> 120



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# File 'lib/viral_seq/math.rb', line 160

def !
  if self == 0
    return 1
  else
    (1..self).inject(:*)
  end
end