I bet you it doesn't :-). It may be rendered like that but I doubt
very much the server is returning the form ({..} {..} {..}) as that is
interpreted as a function call. It will almost certainly be returning
a sequence of the form '({..} {..} {..}) which isn't a functional call
but is a sequence of maps.
Let's break it down a bit.
The arguments to map are (map fn sequence) so it returns the result of
executing fn with each element in the sequence. Rather than (map (->
class1 :people) [:name :age])) you want something like (map [:name
:age] (-> class1 :people)). That still isn't going to work though as
it will execute [:name :age] against each element in the value of the
key :people in the class1 map.
(remember that keywords (e.g. :people) are functions that look
themselves up in the argument to the keyword which is assumed to be
associative. So (:people class1) will be replaced with the value of
calling :people on class1 which will retrieve the value of :people in
class1.
Getting closer though. You want to extract the :name and :age from
each map in (:people class1). A perfect function for that is juxt
which returns a vector filled with the results of calling each
function passed to juxt. So (juxt :name :age) returns a function,
which when called with a parameter will return a vector of the result
of calling :name against the parameter and :age against the parameter.
Remember that keywords are functions. A longer, but maybe more
transparent way would be (map (fn [m] [(:name m) (:age m)]) (:people
class1)).
Finally, map returns a sequence but you want it to be a vector (why?)
so you can use either (into [] sequence), (vector sequence) or mapv
which is identical to map except it returns a sequence.
So, all together:
(
-- returns a sequence by applying
mapv
-- a function which returns [(:name m) (:age m)] which is applied to
(juxt :name :age)
-- each item in the sequence that is the value of :people in the map class1
(:people class1)
)
HTH.
On 30 November 2016 at 11:54, 'Rickesh Bedia' via Clojure
<clojure@googlegroups.com> wrote:
> Because the information is coming from a table I don't know if I can change
> it to look like that.
>
> The information from the table looks like {:people ({:name "John" :age 25}
> {:name "Harry" :age 23} {:name "Peter" :age 24})}
>
> I was wondering if you could apply (into [] (map (-> class1 :people) [:name
> :age])) to each of the {:name "Peter" :age "24"}, {:name "John" :age "25"},
> {:name "Harry" :age "23"} and then put that into a vector so the final
> vector is in the form
> [["John" "25"]
> ["Harry" "23"]
> ["Peter" "24"]]
>
> On Wednesday, 30 November 2016 10:37:04 UTC, Colin Yates wrote:
>>
>> (def class1 {:people '({:name "John" :age "25"} {:name "Harry" :age
>> "23"} {:name "Peter" :age "24"})}) or (def class1 {:people [{:name
>> "John" :age "25"} {:name "Harry" :age "23"} {:name "Peter" :age
>> "24"}]}) is probably what you want.
>>
>> (mapv (juxt :name :age) (:people class1)) on either of those will give
>> you your result.
>>
>> On 30 November 2016 at 10:34, Colin Yates <colin...@gmail.com> wrote:
>> > Ah, I just realised people is _not_ a sequence of maps but the result
>> > of calling '{:name "John" :age "25"}' passing in the other two maps as
>> > arguments. You probably want a literal literal '({:name "John" :age
>> > "25"}.....) or a vector [{:name "John" :age "25"}...]
>> >
>> > On 30 November 2016 at 10:29, Colin Yates <colin...@gmail.com> wrote:
>> >> (mapv (juxt :name :age) (:people class1)) should work
>> >>
>> >> On 30 November 2016 at 10:27, 'Rickesh Bedia' via Clojure
>> >> <clo...@googlegroups.com> wrote:
>> >>> I have a definition:
>> >>> (def class1 {:people ({:name "John" :age "25"}
>> >>> {:name "Harry" :age "23"}
>> >>> {:name "Peter" :age "24"})})
>> >>>
>> >>> The result I want is a vector that looks like
>> >>> [["John" "25"]
>> >>> ["Harry" "23"]
>> >>> ["Peter" "24"]]
>> >>>
>> >>> If I call (map (-> class1 :people) [:name :age])
>> >>> then I get the result ("Peter" "24"). Why do I only get the values
>> >>> from the
>> >>> last hashmap and not the others?
>> >>>
>> >>> If I then call (into [] (map (-> class1 :people) [:name :age]))
>> >>> then I get the result ["Peter" "24"]
>> >>>
>> >>> What I need to do is run the 'into' function again on the other two
>> >>> hashmaps
>> >>> and then put the 3 results into a vector but I don't know how to do
>> >>> this.
>> >>>
>> >>> Any help would be much appreciated
>> >>>
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