Is there a way to condensate to condensate into one line the lines that check if the array exist and creates and empty one, and the one that pushes a new element into it?

```
hash = {}
(('a'..'z').to_a+('a'..'z').to_a).shuffle.each do |e|
    hash[:"#{e}"] ||= []
    hash[:"#{e}"] << rand(10)
end

```

I am looking something more of the style "||=" but for the "<<" operand
thanks for the help