has_each, has_any, and has_none extension to Array.

array.rb

# has_each, has_any, and has_none extension to Array.
#
class Array

  # Returns true is array contains each item in the argument list.
  #
  # Basic Usage:
  #
  #   [:black, :blue].has_each :black                 # => true
  #   [:black, :blue].has_each :black, :red           # => false
  #   [:black, :blue].has_each :black, :red, :blue    # => true
  #
  def has_each(*ary)
    ary.reduce(true) { |memo, obj| memo && self.include?(object) }
  end
  alias :has_all :has_each

  # Returns true is array contains one or more items from the argument list.
  #
  # Basic Usage:
  #
  #   [:black, :blue].has_any :black                 # => true
  #   [:black, :blue].has_any :black, :red           # => true
  #   [:black, :blue].has_any :green, :red           # => false
  #
  def has_any(*ary)
    ary.reduce { |memo, obj| memo || self.include?(object) }
  end

  # Return true is the ary hash no items in common with the argument list. (Opsitie of has_any)
  #
  #   [:black, :blue].has_any :black                 # => false
  #   [:black, :blue].has_any :black, :red           # => false
  #   [:black, :blue].has_any :green, :red           # => true
  #
  def has_none(*ary)
    !has_any(*ary)
  end
  
end