Converting a hash into a nested hash

Question

This question is the inverse of this question.

Given a hash that has an array for each key like

{
    [:a, :b, :c] => 1,
    [:a, :b, :d] => 2,         


        

Answer 1

Using DeepEnumerable:

require DeepEnumerable

h = {[:a, :b, :c]=>1, [:a, :b, :d]=>2, [:a, :e]=>3, [:f]=>4}

h.inject({}){|hash, kv| hash.deep_set(*kv)}