Can you please explain why this code produces such a result?

Question

ruby

This code

as a result gives this, help me understand why

I am new to ruby, reading a book, I just can not digest this moment.
Why not 2 arrays as a result, namely 1? And how does this code actually work?

Answer 1

Because you initialize all default values ​​with one array.
If you want different arrays, then do this:
More info .