johanlunds · May 5, 2017 14:17
diff --git a/hash_with_exception_on_missing_key.rb b/hash_with_exception_on_missing_key.rb
 # A utility class with added behavior that it raises an exception if a key does not
 # exist in hash.
 module HashWithExceptionOnMissingKey
  def self.new(hash)
    obj = Hash.new do |hash, key|
      raise ArgumentError, "Key #{key.inspect} does not exist in hash"
    end

    obj.merge!(hash)
  end
 end
	# A utility class with added behavior that it raises an exception if a key does not
	# exist in hash.
	module HashWithExceptionOnMissingKey
	def self.new(hash)
	obj = Hash.new do \|hash, key\|
	raise ArgumentError, "Key #{key.inspect} does not exist in hash"
	end

	obj.merge!(hash)
	end
	end