From: Adam Prescott <adam@...>
Date: 2011-08-23T00:38:33+09:00
Subject: Re: New to Ruby some problems

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On Mon, Aug 22, 2011 at 3:05 PM, Chuck Remes <cremes.devlist@mac.com> wrote:

> Sorry, I didn't read the problem closely enough (too early in the
> morning!). You need to pass a ROW and COLUMN to set or get a value in your
> matrix instead of just a single value like I posted above.
>
> Something like this might be a good start (untested).
>
> class Matrix
>  [...]
>
>  def set(x, y, value)
>    @array[index(x, y)] = value
>  end
>
>  def get(x, y)
>    @array[index(x,y)]
>  end
>
>  [...]
> end
>

Not sure if you know this, but you can actually still use the [] approach
with multiple arguments, to avoid "set" and "get" method names. A stupid
example:

class X
  def []=(a, b, c)
    p [a, b]
    @a, @b = c, c.reverse
  end

  attr_reader :a, :b
end

x = X.new
x[1, 2] = "foo" #=> [1, 2]; "foo"
p x #=> #<X:0x00000100861f18 @a="foo", @b="oof">
puts x.a #=> foo
puts x.b #=> oof

Live output: http://ideone.com/UxWNS

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