Useful methods for ruby hashes

hash_extension.rb

class Hash
  # gets hash-nested values, returns nil if any key is missing
  def dig(*path)
    path.inject(self) do |location, key|
      location.respond_to?(:keys) ? location[key] : nil
    end
  end

  # Deletes key from self and returns self
  def kill(key)
    delete(key)
    self
  end
  
  # Returns self with all specified keys removed
  def kill_all(keys)
    keys.each {|k| kill(k) }
    self
  end
  
  # Returns a copy of self with key removed
  def remove(key)
    self.dup.kill(key)
  end
  
  # Returns a new array with all specified keys removed
  def remove_all(keys)
    self.dup.kill_all(keys)
  end
end