From: Austin Ziegler <austin@...>
Date: 2002-07-02T07:42:48+09:00
Subject: Re: is this the way it should work? newbie problem...

On Tue, 2 Jul 2002 07:30:23 +0900, MIcha wrote:
>Hi,
>
>that seems not to work: (it' ported from perl to ruby:-)
>
>x = max_x if --x == 0;
>
>the variable x is never decremented.
>why?

Ruby doesn't have ++ or --. For incrementing, the succ method is the 
preferred way, but (at least according to Pickaxe) there is no 
corresponding prev method. You can simulate it with the modifications 
below. Note that I am still having to do assignment because Fixnum is 
an immediate value (you can't do self -= amt like you could in other 
cases).

class Integer
    def dec(amt = 1)
        self - amt
	end

    def inc(amt = 1)
        self + amt
    end
end

p 5.dec     # => 4
p 5.dec(3)  # => 3
p 5.inc     # => 6
p 5.inc(3)  # => 8

max_x = 50
x = 2

x = x.dec
x = max_x if (x = x.dec) == 0;
p x

-austin
-- Austin Ziegler, austin@halostatue.ca on 2002.07.01 at 18.32.35