Feature #17155
open
Add a Diggable mixin
Description
Ruby 2.3 introduced the #dig method as a general way to access elements in deep structures. Initially it was implemented only for Array and Hash. In the meanwhile also the classes Struct, OpenStruct and Set have a #dig method. There is also a proposal to implement #dig for Thread.
In my development I have own classes which have a #[] method implemented and are also candidates for a #dig method. But implementing #dig isn't so trivial as it seems: you have to handle some corner cases. This is the intention for my proposal: Add a Diggable mixin to Ruby (core or stdlib). A simple implementation of it could be something like this:
module Diggable
def dig *args
a = args.shift
o = self[a]
return o if args.empty? || o.nil?
o.send :dig, *args
end
end
So you could simply include Diggable to any class which implements #[], and you would get a #dig method for free. Like Comparable or Enumerable for which you have to implement #<=> respectively #each and get other methods implemented in this mixins.
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