Question

I have such array in ruby (document language [even index] and number of words [odd index])

words = ["en",200,"ru","120","es",140,"ru",240]

Final result should look like:

{"en"=>200,"ru=>360","es"=>140}

Answer 1

Ah, you need to sum duplicate keys. So, the Hash::[] method won’t work here. No problem, use each_slice + each_with_object then:

words = ["en",200,"ru","120","es",140,"ru",240]

hash = words.each_slice(2).each_with_object({}) do |(k, v), memo|
  memo[k] ||= 0
  memo[k] += v.to_i
end

hash # => {"en"=>200, "ru"=>360, "es"=>140}