Class: Integer

Inherits:
Object show all
Defined in:
lib/active_object/integer.rb

Constant Summary collapse

ROMAN_VALUES = 
{
  "M"  => 1000,
  "CM" => 900,
  "D"  => 500,
  "CD" => 400,
  "C"  => 100,
  "XC" => 90,
  "L"  => 50,
  "XL" => 40,
  "X"  => 10,
  "IX" => 9,
  "V"  => 5,
  "IV" => 4,
  "I"  => 1
}

Instance Method Summary collapse

Instance Method Details

#factorial ⇒ Object 



19
20
21
22
 
# File 'lib/active_object/integer.rb', line 19

def factorial
  return(1) if zero?
  2.upto(self).inject(1) { |product, n| product * n }
end

#of(&block) ⇒ Object 



24
25
26
 
# File 'lib/active_object/integer.rb', line 24

def of(&block)
  Array.new(self, &block)
end

#roman ⇒ Object 



28
29
30
31
32
33
34
35
 
# File 'lib/active_object/integer.rb', line 28

def roman
  return("") if zero?
  return("-#{(-self).roman}") if self < 0

  ROMAN_VALUES.each do |key, value|
    return(key + (self - value).roman) if value <= self
  end
end

#time ⇒ Object 



37
38
39
 
# File 'lib/active_object/integer.rb', line 37

def time
  Time.at(self)
end