On Sun, Nov 1, 2009 at 8:04 PM, CuppoJava <patrickli_2...@hotmail.com>wrote:
>
> Hi,
> For the purposes of a DSL that I'm writing, it would be very
> convenient to have a break/return statement that early exits from a
> subroutine.
>
>
I'm not sure why you need this.
The body of a function in clojure isn't a series of statements, it's an
expression. do is then just an operator that evaluates it's various
arguments and returns the last one- like + is an operator that evaluates
it's various arguments and returns the sum of them.
So at any point you can stop and return a value, because it's an expression-
you don't need a special statement for that. So, for example, you might
write code like:
(defn example [ x y ]
(do
(foo x) ; This is always done
(if exit-early
3 ; if we want to stop early, we return this value
(do
(bar y)
4))))
A similar thing happens with loop. The default is exiting immediately-
rather than having a special form to exit the loop, you have a special form
to continue the loop (recur). So there is no value to having a break or
return- just don't recur.
Brian
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