Access nested hash element specified by an array of keys [duplicate]

Question

I'm trying to get a general solution to the problem of accessing an element in a nested hash given an array of key values,e.g.:

hash = { "a" => { "b" => 'foo' }}
array = ["a", "b"]

function(array)
=> "foo"

I'm guessing this could be a one-liner. It also is quite closely related to this problem: Ruby convert array to nested hash

The link you have given.. is awesome..I learnt a new concept from that..thanks for finding it out... :) — Arup Rakshit
– Arup Rakshit, Commented Aug 15, 2013 at 11:19

Arup Rakshit · Accepted Answer · 2013-08-15 11:09:59Z

13

hash = { "a" => { "b" => 'foo' }}
array = ["a", "b"]

array.inject(hash,:fetch)
# => "foo"
array.inject(hash,:[])
# => "foo"

answered Aug 15, 2013 at 11:09

Arup Rakshit

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1 Comment

Thanks! In case it helps anyone else, I came across this answer while looking for a Ruby equivalent to Clojure's get-in.