From: Paolo Bonzini <bonzini@...>
Date: 2008-01-10T22:29:58+09:00
Subject: Re: method that generate block?

>   def cart_prod( *args )
>     args.inject([[]]){|old,lst|
>       new = []
>       lst.each{|e| new += old.map{|c| c.dup << e }}
>       new
>     }
>   end
>
> The problem is this method take arrays as argument, how can I pass into
> only one array as argument? (this one array will contains sub arrays
> that I want to make a cartesian product from, for example: vds =
> [[1,2],["a","b"]], how to pass the vds array into the method to get
> cartesian product of  [1,2] and ["a","b"]?)

Remove the * from *args.

Paolo