From: Tachikoma <ikari.shinji.eva@...>
Date: 2008-07-16T16:15:32+09:00
Subject: Re: New to Ruby. Specific syntax question.

On Jul 16, 12:20 pm, Cole Mister <chon...@gmail.com> wrote:
> I'm reading through the PickAxe book right now.  I'm new to programming,
> and more specifically, Ruby.
>
> Right now I'm looking at a line that says this:
> fib_up_to(1000) {|f| print f, ""}
>
> I'm curious about the parts of this statement.
>
> I know that "fib_up_to(1000)" passes 1000 into this specific method.
>
> The thing that gets me confused is the block statement (right
> terminology?).  What's the "|f|"?  I know "print f" says to print this
> variable.  Then, what're the quotes for?
>
> Is a variable "f" created in this block, then told to print, and more
> specifically, told to print into the parentheses?
>
> I'm new, so sorry if this is a hang-up.  I just want to understand.
>
> Thank you.
> --
> Posted viahttp://www.ruby-forum.com/.

it's not a variable create in this block, but a variable passed into
the block

take an example:
def fib_up_to(max)
....
yield t
...
end

fib_up_to(1000) {|f| print f}

the f in block is the t in each step