On Jan 7, 7:01 am, "Mark Volkmann" <[email protected]> wrote:
> On Wed, Jan 7, 2009 at 3:13 AM, Tom Ayerst <[email protected]> wrote:
> > Hi Mark,
>
> > I'm afraid I don't like the "big let" style and I found it hard to follow
> > some of your code, that may just be a personal thing but a lot of the vars
> > defined in let are only used once and could be inlined.
>
> I agree they could be inlined, but I find that style easier to read.
> For example, these are equivalent.
>
> (defn make-cookies-1 [flower baking-soda salt button sugar eggs]
> ; let describes the step-by-step process for making cookies.
> (let [bowl (find-bowl :small)
> bowl (add-ingredients bowl flower baking-soda salt)
> batter (mix bowl)
> batter (add-and-beat batter eggs flour)
> baking-sheet (find-baking-sheet)
> baking-sheet (make-dough-balls baking-sheet batter)]
> (bake baking-sheet)))
>
> (def make-cookies-2 [flower baking-soda salt button sugar eggs]
> (bake (make-dough-balls
> (find-baking-sheet)
> (add-and-beat (mix (add-ingredients (find-bowl) flower aking-soda
> salt) eggs flour))))
>
> Which of these is easier to understand?
You can avoid the big let while still keeping the order of operations
clear by using the -> macro:
(defn make-cookies [flour baking-soda salt butter sugar eggs]
(let [batter (-> (find-bowl :small)
(add ingredients flour baking-soda salt)
(mix)
(add-and-beat eggs flour))]
(-> (find-baking-sheet)
(make-dough-balls batter)
(bake))))
In my opinion, this little macro is a brilliant idea.
-- Nathan
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