Question

I have Hash like this, representing a data tree

hash = {
    'key1' => {
         'sub1' => 1,
         'sub2' => 2
    },
    'key2' => 3
}

I want to explore the tree with an array of keys representing a path.
Some exemples :

with a simple path:

keys = ['key2']

I want to get 3

with this path:

keys = ['key1', 'sub1']

I want to get 1

with invalide path :

keys = ['key1', 'sub1', 'blabla']
keys = ['key1', 'blabla']

get nil

etc … etc … you get the idea

Answer 1

keys.inject(hash) {|acc, value| acc[value]}