New array methods

array_methods.rb

class Array
  
  def hashify
    Hash.new.tap do |hash|
      each { |obj| hash[obj] = yield(obj) }
    end
  end
  
  def reverse_hashify
    Hash.new.tap do |hash|
      each { |obj| hash[ yield(obj) ] = obj }
    end
  end
  
end