Blocks are special arguments to methods. You can pass bloc= ks 3 ways*

foo { puts "bar" }

foo do

=A0 puts "bar"

end

proc =3D lambda { puts "bar" }

foo(&proc)

The reaso= n for the & in the 3rd example is to tell ruby that this argument is ac= tually this "special" block parameter.

The yield method knows to look for this spe= cial parameter and call it.

<= div class=3D"gmail_quote">On Fri, Apr 12, 2013 at 4:12 PM, Vincent Stowbune= nko <lists@ruby-forum.com> wrote:

I am confused about what is going on with th= is code:

def foo
=A0 =A0 yield("Jim")
end

def bar
=A0 =A0baz =3D lambda { |n| n.upcase }
=A0 =A0foo(&baz)
end

bar # =3D> "JIM"

From what I understand where this is going:

1. The method bar is being called.

2. Inside the bar method, the lambda function is being assigned to the
baz variable, to upcase whatever is assigned to the variable n inside
the lambda function.

3. I don't understand the use of ampersand operator associated with the=
variable baz. =A0Whatever that is, it is an argument for the foo method.
4. Inside the foo method, it uses a yield function with an argument
"Jim". =A0Somehow, the string "Jim" made it way to assi= gn to the variable
n, upcasing it.

Can anyone help me clarify what this code is really doing?

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

--089e01681d16f9987b04da2f9f1c--