Ruby: Get all keys in a hash (including sub keys)

Question

let\'s have this hash:

hash = {\"a\" => 1, \"b\" => {\"c\" => 3}}
hash.get_all_keys 
=> [\"a\", \"b\", \"c\"]

how can i get all key

Answer 1

I'm sure there is a more elegant solution, but this option works:

blah = {"a" => 1, "b" => {"c" => 3}}
results = []
blah.each do |k,v|
  if v.is_a? Hash
    results << k
    v.each_key {|key| results << key}
  else
    results << k
  end
end
puts results