StackError: stack level too deep

ruby-talk
1

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.

···

--
Posted via http://www.ruby-forum.com/.

2

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.

···

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.

--
Brian Mattern