From: Anthony Martinez <pi@...>
Date: 2007-06-25T03:59:09+09:00
Subject: Helper to create multi-dimensional arrays

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I came up with this method really quick to create x*y arrays in Ruby. It
mimicks Array#new's behavior pretty closely wrt blocks, I hope. What do you=
 all
think?

class << Array
    def multi(x,y,*args, &block)
        if args.length > 0 and block_given?
            raise ArgumentError, "wrong number of arguments (#{args.length =
+ 2} for 2)"
        elsif args.length > 1 and not block_given?
            raise ArgumentError, "wrong number of arguments (#{args.length =
+ 2} for 3)"
        end

        Array.new(x) do
            if block_given?
                Array.new(y, &block)
            else
                Array.new(y, args[0])
            end
        end
    end
end

Usage is:

Array.multi(5,5,0) =20
# =3D> [[0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0], [0, 0, 0, 0, 0],=
 [0, 0, 0, 0, 0]]
Array.multi(5,5) {""}
# =3D> [["", "", "", "", ""], ["", "", "", "", ""], ["", "", "", "", ""], [=
"", "", "", "", ""], ["", "", "", "", ""]]

--=20
panic ("No CPUs found.  System halted.\n");
        2.4.3 linux/arch/parisc/kernel/setup.c

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