# Useful Hash and Array extensions
# works well with Sams Extlib
#

class Hash

  def with(overrides = {})
    self.merge overrides
  end

  def symbolize_keys!
    replace(inject({}) { |h,(k,v)| h[k.to_sym] = v; h })
  end

  def stringify_keys!
    replace(inject({}) { |h,(k,v)| h[k.to_s] = v; h })
  end

  def downcase_keys!
    replace(inject({}) { |h,(k,v)| h[k.downcase] = v; h })
  end

  def downcase_values!
    replace(inject({}) { |h,(k,v)|
      h[k] = (v.instance_of? String) ? v.downcase : v ; h})
  end

end

class Array
  def except(*rejected)
      arr = self.dup
      rejected.each {|v| arr.delete(v) }
      arr
    end
end

class Object

  def self.direct_descendants
    arr = []
    ObjectSpace.each_object do |obj|
      if obj.class == Class and obj.superclass == self
        arr << obj
      end
    end
    arr
  end

end