From: kjana@...4lab.to (YANAGAWA Kazuhisa)
Date: 2003-02-01T11:29:55+09:00
Subject: Re: break out of a loop

In message <pan.2003.01.31.18.58.57.162192@nc.rr.com>
cyclists@nc.rr.com writes:

> i = 0
> catch(:oops) do
>     10.times { |i|
>         throw :oops if (some condition)
>         }
>     end
> puts "Loop terminated prematurely" if i < 9
> exit

Or more:

    result = catch(:oops) do
               10.times {|i| throw(:oops, :break) if some_condition}
             end
    # result == :break if some condition

Namely throw can throw some value to a catch tag and catch returns the
thrown value.

So you also can break out on multiple conditions and know the cause,
or break nested loop and distinguish which loop breaks.

# with no throw, result is a value of a block given to catch.


-- 
kjana@dm4lab.to                               February 1, 2003
Of two evils choose the lesser.