From: Robert Klemme <shortcutter@...>
Date: 2006-12-30T02:00:06+09:00
Subject: Re: Another Q: find behavior

On 29.12.2006 17:08, Krekna Mektek wrote:
> Hi,
> 
> Still learning from the Pickaxe book, and I've got a question about this 
> code:
> 
> class Array
>  def find
>     for i in 0..size

That line should read

for i in 0...size

Otherwise you will always throw nil at your test if it failed for all 
elements in the array.

>       value = self[i]
>       puts self[i]
>       return value if yield(value)
>     end
>     return nil
>   end
> end
> 
> [1,3,5,7,9].find {|v| v*v > 30 }
> 
> irb(main):369:0> [1,3,5,7,9].find {|v| v*v > 30 }
> => 7
> 
> 
> how come it prints only 7, and not also 9?

Because the "return" will immediately make the method exit.

> The loop is not stopping as far as I can see, and 9 times 9 is also
> bigger then 30.

The loop will stop once the first match is found precisely because of 
the "return".  Either you tested a different piece of code than you 
posted or you overlooked something.

Kind regards

	robert