Printing all key values in a nested hash in Ruby?

Question

I have the following hash:

doc = {"house"=>{"Team 1"=>0, "Team 2"=>0, "Team 3"=>0, "Team 4"=>0}}

I am trying to print the "Team" keys.

For example:

Team 1
Team 2
Team 3
Team 4

I tried using doc.values but this returns an array [{"Team 1"=>0, "Team 2"=>0, "Team 3"=>0, "Team 4"=>0}] . Which means I can't do doc.values.keys .

I tried using a for loop, but somehow it prints the value this way instead:

Team 1
0
Team 2
0
..

Is there a way to to get these keys?

Answer 1

This should do it:

puts doc["house"].keys

If you don't necessarily know what the first key will be, this also works:

puts doc.values.flat_map(&:keys)

Just for fun, here's a third approach, if you know there'll always be just the one outer key:

puts doc[doc.keys.first].keys

That what you're after? Hope it helps - let me know if you've any questions!