How can I marshal a hash with arrays?

Question

What should I do to marshal an hash of arrays? The following code only prints {}.

s = Hash.new
s.default = Array.new
s[0] <<          


        

Answer 1

You can just create your hash structure while initialing Hash.new to avoid such trouble

h = Hash.new{ |a,b| a[b] = [] }
h[:my_key] << "my value"