From: John Merlino <stoicism1@...>
Date: 2010-01-18T02:35:20+09:00
Subject: Re: What does ||= represent in this situation?

John Merlino wrote:
> Hey all, || is equal to Or. So what would ||= in this situation?
> 
> def expensive
>   @expensive ||=
>     begin
>       n = 99
>       buf = ""
>       begin
>         buf << "#{n} bottles of beer on the wall\n"
>         # ...
>         n -= 1
>       end while n > 0
>       buf << "no more bottles of beer"
>     end
> end
> 
> Thanks for all suggestions. Also if you can interpret this, that would
> be nice. What it appears here is an attempt of a do while loop.

I can't figure out how to edit a post. But I don't need anyone to 
interpret the code from "begin" to "end". I know this is executing n 
until it is no longer greater than 0. But what I'm trying to find is 
something similar to what can be done in javascript:

In javascript, there are  cases where you have a variable called, let's 
say, old which contains 50 positions in an array. Now you want each 
position of the array to be unique. But at the same time, you want to 
generate random numbers for each item of the array:

var old = new array(20)
var new
do {
  new = Math.floor(Math.random()*100) + 1;
}
while (old[new]);

old[new] = true;

Is there a way to do a do while loop like this in Ruby?
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