From: sawadatsuyoshi@...
Date: 2018-02-13T10:24:46+00:00
Subject: [ruby-core:85518] [Ruby trunk Feature#14468] Add Proc#dig

Issue #14468 has been updated by sawa (Tsuyoshi Sawada).


I am also not a fan of this particular case, but I think it makes sense to let `dig` call `fetch` (or `[]`) recursively, whenever the element responds to it.

----------------------------------------
Feature #14468: Add Proc#dig
https://bugs.ruby-lang.org/issues/14468#change-70310

* Author: bradleybuda (Bradley Buda)
* Status: Open
* Priority: Normal
* Assignee: matz (Yukihiro Matsumoto)
* Target version: 
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Since Proc already responds to [], it would be cool if Procs could participate in a recursive dig. Like this:

Current Behavior:

~~~
obj = [
  0,
  {
    a: ->(x) { x * 2 },
    b: "c"
  },
]

obj[1][:a][4] == 8 # true
obj.dig(1, :a, 4) == 8 # TypeError (Proc does not have #dig method)
~~~

Desired behavior:

~~~
obj.dig(1, :a, 4) == 8 # true
~~~

I am willing to implement this but I wanted to see if the devs think it is a good idea first. If there are no objections, I'll put together a patch.



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