How do I iterate through a hash until I find a matching element?

Question

I have a hash that maps integers to arrays. For example

{1 => ["abc"], 2 => ["ccc", "ddd"]}

How do I iterate through the hash until I find an entry in which the value only has an array size of 1? Normally I could do

arr.detect{|element| element.size == 1}

but that only works for arrays. I'm not sure how to apply a similar logic to hashes.

Answer 1

Same principle applies:

h = {1 => ["abc"], 2 => ["ccc", "ddd"]}

h.find do |_, l|
  l.size == 1
end
# => [ 1, ["abc"]]

Now if you're looking for that as a more useful variable set:

key, value = h.find do |_, l|
  l.size == 1
end
# => [ 1, ["abc"]]
key
# => 1
value
# => ["abc"]

If you only care about the values, then it's even easier:

list = h.values.find do |l|
  l.size == 1
end