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?
Also, since you can use def to change a binding how do I know for sure
that some function is not generating side-effects? I mean if it's my
code I can be somewhat confident about what it's doing, but if it is a
blackbox function how can I trust it? A very crude example would be
something like:
(defn square [n]
(def x n)
(def n 6)
(* x x))
I've ran that in the repl and it doesn't change the values of what is
passed to it, but is the same true for multithreaded apps? What if
between (def n 6) and (* x x)) a different thread requested the value
of n? Basically, I want to know when is immutability guaranteed?
What is a form? In this overview of clojure, it talks about bindings
and forms. The fragment that I am trying to understand is "The let
special form creates bindings that are local to that form".
http://java.ociweb.com/mark/clojure/article.html#Bindings
Thanks in advance.
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