(for [[x y z] {:a "aa" :b "bb" :c "cc"}] [x y z])
([:c "cc" nil] [:b "bb" nil] [:a "aa" nil]) ;; WTF?
So her, I guess, your taking each entry in the map and destructuring them into
the three vars x, y, and z. Since each map entry is a pair, the third var z
will be nil.
Erik.
--
i farta
> Den 6. jun. 2015 kl. 13.24 skrev gvim <[email protected]>:
>
>> On 06/06/2015 05:01, Sean Corfield wrote:
>> Page 84 is where it shows that maps are a sequence of pairs.
>>
>> The destructuring in James's code is on vectors -- the pairs in the
>> sequence.
>>
>> Hope that helps?
>>
>> Sean
>
> Page 84 describes the sequence abstraction in general but it's the implicit
> seq in for destructuring that threw me as I can't recall an example of it in
> any books I've read. I don't know what to make of this, for example:
>
> (seq {:a "aa" :b "bb" :c "cc"})
> ([:c "cc"] [:b "bb"] [:a "aa"]) ;; Fine so far
>
> (let [[x y z] (seq {:a "aa" :b "bb" :c "cc"})] [x y z])
> [[:c "cc"] [:b "bb"] [:a "aa"]] ;; Consistent with first example above
>
> (for [[x y z] {:a "aa" :b "bb" :c "cc"}] [x y z])
> ([:c "cc" nil] [:b "bb" nil] [:a "aa" nil]) ;; WTF?
>
> Taken together these make no sense to me.
>
> gvim
>
> --
> You received this message because you are subscribed to the Google
> Groups "Clojure" group.
> To post to this group, send email to [email protected]
> Note that posts from new members are moderated - please be patient with your
> first post.
> To unsubscribe from this group, send email to
> [email protected]
> For more options, visit this group at
> http://groups.google.com/group/clojure?hl=en
> --- You received this message because you are subscribed to the Google Groups
> "Clojure" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to [email protected].
> For more options, visit https://groups.google.com/d/optout.
--
You received this message because you are subscribed to the Google
Groups "Clojure" group.
To post to this group, send email to [email protected]
Note that posts from new members are moderated - please be patient with your
first post.
To unsubscribe from this group, send email to
[email protected]
For more options, visit this group at
http://groups.google.com/group/clojure?hl=en
---
You received this message because you are subscribed to the Google Groups
"Clojure" group.
To unsubscribe from this group and stop receiving emails from it, send an email
to [email protected].
For more options, visit https://groups.google.com/d/optout.
