On Tuesday 07 March 2006 13:26, Sebastian Friedrich wrote:
> i'm currently learning Ruby. So, while learning about code blocks and
> yields i wanted to put my freshly acquired knowledge to the test and
> (just to see if i understood correctly) write my own simple each method
> for Arrays. so i did:
>
> class Array
>   def each
>   for x in self
>     yield(x)
>   end
>   end
> end
>
> But running it gives me SystemStackError: stack level too deep. It works
> fine when i rename it, so i guess it's just Ruby not appreciating my
> fine work or somehow making sure i don't introduce flagrant overwrites
> to built-in methods??? Anybody feels like enlightening me on how this
> works? Thanks.

If I'm not mistaken, the "for foo in bar" construct uses the each method. (It 
basically gets translated to "bar.each do |foo|"

So, your method now looks like:

def each
	self.each do |x|
		yield(x)
	end
end

This keeps recursing until ruby kills it due to the stack being too deep.

--
Brian Mattern