On Mon, Jun 14, 2010 at 4:09 PM, Jared <tri...@gmail.com> wrote: > I'm trying to grok this hello world template before I move on to other > stuff. What is the ns line for? I read the documentation on ns, but it > didn't make much sense to me. Is ns related to scope? All I know is > when I delete the ns line the program doesn't compile. >
It's might not be that constructive to grok the hello world template before moving on. That template is largely about creating a Java executable. ns creates a namespace. It allows your program to modular and prevents the likelihood of name clashes. my-namespace/foo your-namespace/foo This way to two functions can have the same name yet be used together in the same program. > Why is it that function declarations must have the arguments as > vector(s), and not lists? As in, why can't I declare a function like > this? > (defn my-test > (list n) > (+ n 1)) > This is a Clojure syntax thing. Bindings happen inside of vectors. > In that default template, why does that hello world program even run? > At what line is main called? By the way, thank you nickikt for the > explanation that main is an overloaded function. That was not obvious > to me. > ns declaration here is being used to generate a Java class from this namespace. The class that defines main in a Java program is the entry point. > Also, I thought this language is functional but I'm able to do change > declarations in the repl. For example: > user=> (def x 1) > #'user/x > user=> x > 1 > user=> (def x 2) > #'user/x > user=> x > 2 > user=> (def x (+ 1 x)) > #'user/x > user=> x > 3 > This is definitely one way to introduce mutability into your program but this is considered bad form. David -- You received this message because you are subscribed to the Google Groups "Clojure" group. To post to this group, send email to clojure@googlegroups.com Note that posts from new members are moderated - please be patient with your first post. To unsubscribe from this group, send email to clojure+unsubscr...@googlegroups.com For more options, visit this group at http://groups.google.com/group/clojure?hl=en
