Ruby: select a value in an array in a hash

Question

I want to iterate through each value of each array of a hash. Normally, to select a value in an array, I would do this:

array = ["1", "2"]
array.each do |x| puts x end

But how do I iterate through the array if it is in a hash?

This is my code:

hash = {1 => {"a1" => ["un", "uno"], "a2" => ["uunn", "uunnoo"]}, 2 => {"b1" => ["deux", "dos"], "b2" => ["ddeuxx", "ddooss"]}}

hash.each do |key, key2, value|
    puts key
    hash[key].each do |key, value|
        puts key
        #insert here the code to iterate through the array
    end
end

And this is the most logic thing that I found but that don't work:

hash = {1 => {"a1" => ["un", "uno"], "a2" => ["uunn", "uunnoo"]}, 2 => {"b1" => ["deux", "dos"], "b2" => ["ddeuxx", "ddooss"]}}

hash.each do |key, key2, value|
    puts key
    hash[key].each do |key, value|
        puts key
        hash[key][value].each do |value|
            puts value
        end
    end
end

Eric Duminil · Accepted Answer · 2017-01-24 17:03:05Z

Solution

Blocks in Hash#each iterate with two variables (|key,value|), and blocks in Array#each iterate with one variable (|element|).

Since you have nested hashes and arrays, you need to apply each multiple times, with different variable names. puts is used with indentation, to better show the structure :

hash = {1 => {"a1" => ["un", "uno"], "a2" => ["uunn", "uunnoo"]}, 2 => {"b1" => ["deux", "dos"], "b2" => ["ddeuxx", "ddooss"]}}

hash.each do |id, sub_hash|
  puts id
  sub_hash.each do |key, sub_array|
    puts "  #{key}"
    sub_array.each do |word|
      puts "    #{word}"
    end
  end
end

It outputs

1
  a1
    un
    uno
  a2
    uunn
    uunnoo
2
  b1
    deux
    dos
  b2
    ddeuxx
    ddooss

Your code

Here's your code with the least amount of modifications :

hash.each do |key1, value1|
    puts key1
    hash[key1].each do |key2, value2|
        puts key2
        hash[key1][key2].each do |value|
            puts value
        end
    end
end

Note that hash[key1] is actually value1, and hash[key1][key2] is value2.

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