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] <javascript:>>
> 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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