Passing procs around in variables

Hi,
This might be something really simple, but I’m trying to write a
console-based menu for my program. I’ve done this before in a
procedural language, but I decided to try and port what I’ve done to
ruby, because it’ll make other parts of my program far easier. My
program has a few menus, so it’d be nice to have re-usable code (which
the procedural version didn’t have much of).

The best way I’ve come up with is to pass the method calls which are
executed by each menu item as procs, but this requires passing them
around between two objects internally. (I haven’t completely decided
how I’m going to structure the code which passes the procs… I have
an idea, but I’ll cross that when I come to it)

Now, the Item class, which each menu item is an object of, doesn’t
work as expected… take a look here: Parked at Loopia.
When I try to call myItem.execute!, it complains “no block given”. If
I call myItem.execute! { 2 + 1}, then it works, but that’s not what I
want…

I’ve also included the Menu class, just in case anybody has any advice
as to how to do the whole thing better.

Thanks,
-Nathan

2008/3/9, Nathan [email protected]:

[…]
Now, the Item class, which each menu item is an object of, doesn’t
work as expected… take a look here: Parked at Loopia.
When I try to call myItem.execute!, it complains “no block given”. If
I call myItem.execute! { 2 + 1}, then it works, but that’s not what I
want…

end
end

Use yield when the block is not stored in a variable.
What your yield line does is this: Call the block given to
execute! with @proc as argument.

Once you have a proc object, you can call it, well, with
the “call” method. Just change “yield @proc” to
@proc.call” and it should work.

HTH,
Stefan

On Sun, 09 Mar 2008 17:48:36 -0500, Nathan wrote:

around between two objects internally. (I haven’t completely decided how

Thanks,
-Nathan

In addition to what Stefan L. said about @proc.call, I just wanted to
point out that there’s no need to keep different classes in different
files. (This isn’t Java.)

–Ken

Thanks, that’s great.

On Mar 9, 11:02 pm, “Stefan L.” [email protected]

Yeah, I know. I´m just doing it like that for now, then I´ll put them
all together at the end. Thanks though.
-N