From: janfri26@... Date: 2020-09-05T14:05:10+00:00 Subject: [ruby-core:99943] [Ruby master Feature#17155] Add a Diggable mixin Issue #17155 has been reported by janfri (Jan Friedrich). ---------------------------------------- Feature #17155: Add a Diggable mixin https://bugs.ruby-lang.org/issues/17155 * Author: janfri (Jan Friedrich) * Status: Open * Priority: Normal ---------------------------------------- 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](https://bugs.ruby-lang.org/issues/16425) 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: ```Ruby 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 ```#each``` respectively ```#<=>``` and get other methods implemented in this mixins. -- https://bugs.ruby-lang.org/ Unsubscribe: