Arc Forumnew | comments | leaders | submitlogin
3 points by rocketnia 5263 days ago | link | parent

1) I think you're missing the whole point of 'let.

  arc> (= x 5)
  5
  arc>
    (let x 3         ; "declare" a var with value 3
      (= x (* x x))
      (+ x 2))
  11
  arc> x
  5
If you want to separate the declaration from the initial value... why? What happens if you use the variable in between those two times?

2) For what it's worth, my Lathe library provides a certain sort of namespaces, and I've been using those pretty happily. (http://arclanguage.org/item?id=11610) But of course I'd be happy with them, 'cause I'm their author. :-p

3) Why would you need a macro to expand to...

  (w/alias (var this.var var2 this.var2)
    (def myfunc (this arg1 arg2)
      ...))
...when it could already expand to something like this?

  (def myfunc (this arg1 arg2)
    (with (var this!var var2 this!var2)
      ...))
That said, I think 'symbol-macro-let would be nifty. I wonder if it could be even more useful to have some way to build a lambda whose free variables were treated in a custom way (as opposed to just being globals). Either one of these could be a basis for scoped importing of namespaces.