From: "framefritti@..." <framefritti@...>
Date: 2008-03-04T00:04:56+09:00
Subject: Re: Normal For Loop



Cory Cory ha scritto:

> I understand that all of these for-each style loops are available, but I
> don't want to always go through the entire loop, sometimes I want to
> stop at some earlier condition.
>
> I tried to do this the other night, but right now I can't find a good
> example so here it goes:
>
> a = some_array
> minValue = 999999
> for(i=0; i<a.length && minValue!=0; i+=1) {
>    minValue = (5000 - a[i]).abs
> }
>
>
> This isn't the best example.  However, there are many times like the
> loop above where I want to go through the whole thing, but if I find
> exactly what I am looking for, I want to bail out early instead of
> wasting that processing time.

In this case you can use "break" construct  (which I, personally,
love).  For example,

minValue = 999999
a.each do |x|
  minValue = (5000-x).abs
  break if minValue==0
end

(I did not actually try it, but it should work)
>
> Also, I sometimes may want to not actually iterate straight through, but
> browse through the array in some more complex order.

In this case I'm afraid that you must resort to a while...  (BTW, I
always considered
C-style "for" as a "while" in disguise... ;-)
> --
> Posted via http://www.ruby-forum.com/.