Thanks,
Still not what I was expecting.
Suppose I have a map called records which has this [{:name ‘roelof’ :city
‘secret’} {:name ‘somewhere-else’ :city ‘who-knows’}]
When I do :
(defn convert-back
"converts the map back to a csv string"
[{:keys [name, glitter-index]}, records ]
(map (fn [{:keys [name glitter-index]}] (clojure.string/join ","
[name glitter-index]))) records)
I see this error message :
ArityException Wrong number of args (1) passed to: core/convert-back
clojure.lang.AFn.throwArity (AFn.java:429)
and when im doing :
(defn convert-back
"converts the map back to a csv string"
[records ]
(map (fn [{:keys [name glitter-index]}] (clojure.string/join ","
[name glitter-index]))) records)
I see this as output ;
{:name "roelof", :glitter-index 2}
Frustating to learn clojure
Op vrijdag 23 oktober 2015 14:50:30 UTC+2 schreef Colin Yates:
> clojure.string/join not clojure.join/string
>
> On 23 Oct 2015, at 13:49, r/ Wobben <[email protected] <javascript:>>
> wrote:
>
> Thanks,
>
> I tried it like this :
>
> (defn convert-back
> "converts the map back to a csv string"
> [{:keys [name, city]}, records ]
> (map (fn [{:keys [name city]}] (clojure.join/string “,” [name
> city]))) records)
>
> and then I do : (convert-back {:name "roelof" :city: secret}, { :name "X"
> :city "Earth"} )
>
> and I see this error when running in repl :
>
> #error {
> :cause clojure.join
> :via
> [{:type clojure.lang.Compiler$CompilerException
> :message java.lang.ClassNotFoundException: clojure.join,
> compiling:(chapter_4/core.clj:56:47)
> :at [clojure.lang.Compiler analyzeSeq Compiler.java 6730]}
> {:type java.lang.ClassNotFoundException
> :message clojure.join
> :at [java.net.URLClassLoader$1 run URLClassLoader.java 366]}]
> :trace
> [[java.net.URLClassLoader$1 run URLClassLoader.java 366]
> [java.net.URLClassLoader$1 run URLClassLoader.java 355]
> [java.security.AccessController doPrivileged AccessController.java -2]
>
> e clojure.join
> :via
> [{:type clojure.lang.Compiler$CompilerException
> :message java.lang.ClassNotFoundException: clojure.join,
> compiling:(chapter_4/core.clj:56:47)
> :at [clojure.lang.Compiler analyzeSeq Compiler.java 6730]}
> {:type java.lang.ClassNotFoundException
> :message clojure.join
> :at [java.net.URLClassLoader$1 run URLClassLoader.java 366]}]
> :trace
> [[java.net.URLClassLoader$1 run URLClassLoader.java 366]
> [java.net.URLClassLoader$1 run URLClassLoader.java 355]
> [java.security.AccessController doPrivileged AccessController.java -2]
>
>
> #error {
> :cause clojure.join
> :via
> [{:type clojure.lang.Compiler$CompilerException
> :message java.lang.ClassNotFoundException: clojure.join,
> compiling:(chapter_4/core.clj:56:47)
> :at [clojure.lang.Compiler analyzeSeq Compiler.java 6730]}
> {:type java.lang.ClassNotFoundException
> :message clojure.join
> :at [java.net.URLClassLoader$1 run URLClassLoader.java 366]}]
> :trace
> [[java.net.URLClassLoader$1 run URLClassLoader.java 366]
> [java.net.URLClassLoader$1 run URLClassLoader.java 355]
> [java.security.AccessController doPrivileged AccessController.java -2]
>
> Roelof
>
>
> (convert-back {:name "roelof" :glitter-index 2 })(convert-back {:name
> "roelof" :glitter-index 2 })
>
>
> Op vrijdag 23 oktober 2015 14:25:44 UTC+2 schreef Colin Yates:
>>
>> (apply clojure.string/join “," (vals my-map)) would work but you can’t
>> guarantee the order.
>>
>> (map (fn [{:keys [name city]}] (clojure.join/string “,” [name city])))
>> my-map) gives you control of the order in which the fields are processed.
>>
>> You could also look at juxt as well?
>>
>> On 23 Oct 2015, at 12:49, r/ Wobben <[email protected]> wrote:
>>
>> Hello,
>>
>> As a challenge I need to convert a map structure to a csv structure.
>>
>> So ( { :name "roelof", :city secret }) need to be converted to roelof,
>> secret.
>>
>> I think I can use something like (map clojure.string/join ..) for it but
>> it seems I have to make a function out of the :name roelof part to get
>> roelof back.
>>
>> I could use get for then I do not know how to call 1 records of the
>> whole map.
>>
>> Can someone explain in simple English how I can solve this one ?
>>
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