On Jun 18, 8:43 am, Craig Andera <cand...@wangdera.com> wrote:
> > I'm a little confused over when to use a var vs. a ref vs. an agent
> > vs. an atom. For writing small (<200 lines) single-threaded programs
> > when do I want to use each one?
>
> In addition to the great answers you got here, you could have a look
> at my screencast series on vars, refs, agents, and atoms:
>
> http://link.pluralsight.com/clojure
>
> Ignore the (unfortunate) prominence of the Silverlight player - the
> "mobile" button will give you downloads in all sorts of formats.
All these links and discussions have been helpful, but especially that
screencast. I've only watched the first two and it has cleared up many
misconceptions I had.
Do Clojure programs need a main method? The reason I'm asking is
because the default netbeans template writes something similar to
this:
(defn -main [ ] stuff blah-blah)
Which proceeds to evaluate stuff blah-blah. From experimentation it
seems I don't need a main method to evaluate expression. I can have a
program that is only the namespace delcaration and (println "hi"), and
it runs. It does give me an exception, but it runs. Is this exception
a bad thing? Is using -main a matter of convention? Is -main some sort
of key word, or special phrase? If so why is it -main, and not main?
It seems counterintuitive to define a function just like any other
function using defn, but this function happens to special.
What is the value of a do block? Specifically in Craig's screencast on
Vars he types up:
(do
(binding [foo "Keith"]
(with-new-thread
(fn [] (print-foo "background: ")))
(print-foo "foreground1 "))
(print-foo "foreground2: "))
If this was written without the do how does it affect the program?:
(binding [foo "Keith"]
(with-new-thread
(fn (print-foo "background: ")))
(print-foo "foreground1: "))
(print-foo "foreground2: ")
It might be easier to see this in his video, which would be at 17:13.
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