Am 07.11.2011 14:02, schrieb Scott Jaderholm:
> On Mon, Nov 7, 2011 at 4:27 AM, Dennis Haupt <[email protected]
> <mailto:[email protected]>> wrote:
>
> Am 07.11.2011 10:18, schrieb Dennis Haupt:
> >
> >>
> >>
> >> In his code I did notice he doesn't use destructing very much.
> >>
> >
> > where would that have been useful?
>
> defn x [{:keys [foo bar]} param]
>
> instead of
>
> defn x [param]
> (let [foo (:foo param)...])
>
> This
>
> (defn advance-movement [game-element]
> (let [stats (:stats game-element)
> position-change (:movement stats)
> x-change (:x position-change)
> y-change (:y position-change)
> with-new-movement
> (update-in game-element [:stats :position ] #(translated %
> x-change y-change))]
> with-new-movement))
>
> can be this
>
> (defn advance-movement [{{{:keys [x y]} :movement} :stats}]
> (update-in game-element [:stats :position ] translated x y))
>
> or if you want the docstring to be short
>
> (defn advance-movement [game-element]
> (let [{{{:keys [x y]} :movement} :stats} game-element]
> (update-in game-element [:stats :position ] translated x y)))
>
> Note how you don't need the extra function #().
>
> I've also noticed that you name your last result in a let and then
> return it. I think it's more common to just return it and not name the
> final thing.
that's because there once was some code which i deleted. i was too lazy
to remove the part in the let :)
>
> Also sometimes you create a separate let under a let divided maybe only
> by side effects, such as in split-up-asteroid. You could use one let and
> use _ bindings for side effects.
let [_ (println "like this?")]
>
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