3 Examples top

• link | changes

  ;; If you try this, you're doing it wrong
  user=> (create-ns my-new-namespace)
  java.lang.Exception: Unable to resolve symbol: my-new-namespace in this context (NO_SOURCE_FILE:2)
  
  
  ;; Same deal, if you try this, you're doing it wrong
  user=> (create-ns "my-new-namespace")
  java.lang.ClassCastException: java.lang.String cannot be cast to clojure.lang.Symbol (NO_SOURCE_FILE:0)
  
  
  ;; This is how you do it
  user=> (create-ns 'my-new-namespace)
  #<Namespace my-new-namespace>
  

  ;; If you try this, you're doing it wrong user=> (create-ns my-new-namespace) java.lang.Exception: Unable to resolve symbol: my-new-namespace in this context (NO_SOURCE_FILE:2) ;; Same deal, if you try this, you're doing it wrong user=> (create-ns "my-new-namespace") java.lang.ClassCastException: java.lang.String cannot be cast to clojure.lang.Symbol (NO_SOURCE_FILE:0) ;; This is how you do it user=> (create-ns 'my-new-namespace) #<Namespace my-new-namespace>
• link | changes

  ;; Let's create a namespace and check for our result
  ;; the new namespace will be "my-new-namespace"
  
  ;; obviously, it does not exist yet, so looking for it, finds nothing
  user=> (find-ns 'my-new-namespace) 
  nil
  
  ;; let's create it
  user=> (create-ns 'my-new-namespace)
  #<Namespace my-new-namespace>
  
  ;; now searching for it again will have a result
  user=> (find-ns 'my-new-namespace)
  #<Namespace my-new-namespace>
  

  ;; Let's create a namespace and check for our result ;; the new namespace will be "my-new-namespace" ;; obviously, it does not exist yet, so looking for it, finds nothing user=> (find-ns 'my-new-namespace) nil ;; let's create it user=> (create-ns 'my-new-namespace) #<Namespace my-new-namespace> ;; now searching for it again will have a result user=> (find-ns 'my-new-namespace) #<Namespace my-new-namespace>
• link | changes

  ;; You can create a namespace, not switch to it and still work in, by storing it
  
  ;; create the namespace
  user=> (def for-later-use (create-ns 'my-namespace))
  #'user/for-later-use
  
  ;; assign a value for a variable
  user=> (intern for-later-use 'my-var "some value")
  #'my-namespace/my-var
  ;; notice how the "for-later-use" symbol has been evaluated to the namespace it represents
  
  ;; check the new variable
  user=> my-namespace/my-var
  "some value"
  
  ;; you can also work on a namespace by using the its name
  ;; (but quoting it) instead of the return of "create-ns"
  user=> (intern 'my-namespace 'my-var "some other value")
  #'my-namespace/my-var
  
  ;; check the new assignment and see what's changed
  user=> my-namespace/my-var
  "some other value"
  

  ;; You can create a namespace, not switch to it and still work in, by storing it ;; create the namespace user=> (def for-later-use (create-ns 'my-namespace)) #'user/for-later-use ;; assign a value for a variable user=> (intern for-later-use 'my-var "some value") #'my-namespace/my-var ;; notice how the "for-later-use" symbol has been evaluated to the namespace it represents ;; check the new variable user=> my-namespace/my-var "some value" ;; you can also work on a namespace by using the its name ;; (but quoting it) instead of the return of "create-ns" user=> (intern 'my-namespace 'my-var "some other value") #'my-namespace/my-var ;; check the new assignment and see what's changed user=> my-namespace/my-var "some other value"