play_finder.rb

def find_in(collection:, query:)
  result = collection.dig(*query[:object_path])

  case result
  when Array then
    return result[query[:position]]
  else
    return result
  end
end

# Example data
data = {
  foo: {
    bar: {
      baz: ['can you', 'find', 'me?', '!found!']
    }
  }
}

# query built from imaginary search that has already
# happened
query = {
  object_path: [:foo, :bar, :baz],
  position: 3
}

puts find_in(collection: data, query: query)

# => !found!