From: Thomas Hafner <thomas@...>
Date: 2007-01-29T20:55:05+09:00
Subject: Re: cartesian product of arrays

"karoyakani" <tj.takei@gmail.com> wrote/schrieb <1170049485.669713.169350@h3g2000cwc.googlegroups.com>:

> def cartprod(*args)
>   args.shift.cartprod(args)
                        ^^^^
    args.shift.cartprod(*args)
with the additional ``*'' would be better ...

> end
> 
> Then both forms work as below:
> p (1..2).cartprod((3..5), (6..8))
> p cartprod([1,2],[3,4,5],[6,7,8])

... otherwise the second statement produces different output.
Very nice!

> Further consideration would be to use a block for output formating:
> e.g. replace result << [n] + a above to yield n, a and a block {|n,a| n
> +a.join(' ')} for string concatination etc

Great, still more abstraction!

Regards
  Thomas