Named Parameters in Ruby Structs

Question

I\'m pretty new to Ruby so apologies if this is an obvious question.

I\'d like to use named parameters when instantiating a Struct, i.e. be able to specify which ite

Answer 1

The less you know, the better. No need to know whether the underlying data structure uses symbols or string, or even whether it can be addressed as a Hash. Just use the attribute setters:

class KwStruct < Struct.new(:qwer, :asdf, :zxcv)
  def initialize *args
    opts = args.last.is_a?(Hash) ? args.pop : Hash.new
    super *args
    opts.each_pair do |k, v|
      self.send "#{k}=", v
    end
  end
end

It takes both positional and keyword arguments:

> KwStruct.new "q", :zxcv => "z"
 => #