From: Tobias Reif <tobiasreif@...>
Date: 2001-11-27T01:51:27+09:00
Subject: [ruby-talk:26528] from_to, upto (recurse, yield)

Hi;

this works:
-----
def from_to first,last
   current = first
   yield current
   if not current >= last
     from_to current.succ,last
   end
end

from_to(3,4) do |integer|
   print integer.to_s + "\n"
end
---gives---
3
4
-----

This doesn't:
-----
def from_to first,last
   current = first
   yield current
   if not current >= last
     from_to current.succ,last
   end
end

from_to(3,5) do |integer|
   print integer.to_s + "\n"
end
---gives---
3
4
rec.rb:14:in `from_to': yield called out of block (LocalJumpError)
         from rec.rb:16:in `from_to'
         from rec.rb:16:in `from_to'
         from rec.rb:20

-----

Why?

same with
---
def upto limit, current=0
   yield current
   if not current >= limit
     upto limit,current.succ
   end
end

upto(1) do |integer|
   print integer.to_s + "\n"
end
---
; works with 1, but not with 2.

Tobi

ruby 1.6.5 (2001-09-19) [i386-cygwin]


-- 
Tobias Reif
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