From: ts <decoux@...>
Date: 2002-01-13T01:40:23+09:00
Subject: Re: Changes to block behavior in ruby 1.6.6

>>>>> "T" == Tobias Reif <tobiasreif@pinkjuice.com> writes:

T>       while number <= limit
T>         yield number
T>         number += step
T>       end
[...]

T>     upto 7 do |number|
[...]
T> run in 1.6.6?

 yes, because you call the block which is given to the method

 What don't work is

    def another_method(number)
       yield number
    end

    def upto limit,modifier=:default
       number,step =
        case modifier
          when :even    then [2,2]
          when :odd     then [1,2]
          when :default then [1,1]
        end
       while number <= limit
         another_method number  # here the modification
         number += step
       end
    end

 the block is given to #upto and not propagated to #another_method

 If you want to give the block to #another_method you must propagate it,
 i.e.

    def upto limit,modifier=:default, &block
       number,step =
        case modifier
          when :even    then [2,2]
          when :odd     then [1,2]
          when :default then [1,1]
        end
       while number <= limit
         another_method number, &block  # here the modification
         number += step
       end
    end




Guy Decoux