Why this program not working?

Ruby
1

Hi

I am trying to execute this program from cookbook.

   def endless_string_succession(start)
while true
  yield start
  start = start.succ
end

end

puts endless_string_succession ‘aa’

Error messages that I am getting

C:/rubyexmples/1_16.rb:8: warning: parenthesize argument(s) for future
version
C:/rubyexmples/1_16.rb:3:in `endless_string_succession’: no block given
(LocalJumpError)
from C:/rubyexmples/1_16.rb:8

Any ideas?

Thanks In advance,
Sharma

2

Sharma C. wrote:

endless_string_succession(‘aa’) { |x| puts x }

3

Florian gave you the right solution, but to explain why, he should
have said the ‘yield’ keyword yields control of the code flow to a
block provided as a parameter (e.g., he provided ‘puts x’ as the block
parameter).

I suggest reading in the Pickage, Ruby for Rails, my book, or in your
favorite Ruby book about block parameters to understand more.

–Jeremy

On 2/23/07, Sharma C. [email protected] wrote:

Any ideas?

Thanks In advance,
Sharma

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

–
http://www.jeremymcanally.com/

My free Ruby e-book:
http://www.humblelittlerubybook.com/book/

My blogs:

http://www.rubyinpractice.com/

4

On Fri, 2007-02-23 at 15:31 +0900, Sharma C. wrote:

Any ideas?

You forgot to pass the block to the method.

endless_string_succession(‘fsck’) {|str| #some crap }

5

Thank you guys for your fast && great responses…

Hemant K. wrote:

On Fri, 2007-02-23 at 15:31 +0900, Sharma C. wrote:

Any ideas?

You forgot to pass the block to the method.

endless_string_succession(‘fsck’) {|str| #some crap }