How can I get the nested keys of a map in clojure?

Question

if my structure is

{ :a :A
  :b :B
  :c {
       :d :D
     }
  :e {
       :f {
            :g :G
            :h :H
          }
     }
}

I

Answer 1

You can build this with clojure.zip or tree-seq fairly easily though I strongly prefer the prismatic.schema library for verifying the structure of nested maps

user> (def my-data-format                                 
  {:a Keyword                                             
   :b Keyword                                             
   :c {:d Keyword}                                        
   :e {:f {:g Keyword                                     
           :h Keyword}}})                                 
#'user/my-data-format                                     
user> (def some-data                                      
         {:a :A                                            
          :b :B                                            
          :c {:d :D}                                       
          :e {:f {:g :G                                    
                  :h :G}}})                                
#'user/some-data                                          
user> (schema/validate my-data-format some-data)          
{:a :A, :c {:d :D}, :b :B, :e {:f {:g :G, :h :G}}}
user> (def some-wrong-data
        {:a :A
         :b :B
         :c {:wrong :D}
         :e {:f {:g :G
                 :h :G}}})
 #'user/some-wrong-data             

 user> (schema/validate my-data-format some-wrong-data)  

ExceptionInfo Value does not match schema: 
{:c {:d missing-required-key, 
     :wrong disallowed-key}}  
schema.core/validate (core.clj:132)