felix wrote in post #1020377:
> def test
> yield
> end
>
yield() means: execute the block that is specified in the method call.
> test do
> p "a"
> end
>
That syntax calls test() and everything after 'do' is a block, which
ruby automatically passes to the method.
Note that your definition of test() requires that a block be specified
when calling test():
def test
yield
end
test()
--output:--
ruby.rb:2:in `test': no block given (yield) (LocalJumpError)
from ruby.rb:5:in `<main>'
Typically test() would be defined like this:
def test
if block_given?
yield
else #do something else
puts "goodbye"
end
end
test()
--output:--
goodbye
> i don`t know how yield function does in detail. why did i write yield
> and then the p 'a' works? i know that it is a Proc object , but i
> don`t know how it works. Is Proc do as a parameter?
> test do
> p "a"
> end
> and is this code which makes the output?
> thanks a lot.
--
Posted via http://www.ruby-forum.com/.
--
You received this message because you are subscribed to the Google Groups "Ruby
on Rails: Talk" group.
To post to this group, send email to rubyonrails-talk@googlegroups.com.
To unsubscribe from this group, send email to
rubyonrails-talk+unsubscr...@googlegroups.com.
For more options, visit this group at
http://groups.google.com/group/rubyonrails-talk?hl=en.
