2 Examples top

• link | changes

  user=> (rename-keys {:a 1, :b 2} {:a :new-a, :b :new-b})
  {:new-a 1, :new-b 2}
  
  
  ;; The behavior when the second map contains a key not in the first is interesting.
  ;; I suspect you shouldn't depend on it. (Clojure 1.1 - no longer happens in 1.2.1)
  
  user=> (rename-keys {:a 1} {:b :new-b})
  { :a 1, :new-b nil}
  

  user=> (rename-keys {:a 1, :b 2} {:a :new-a, :b :new-b}) {:new-a 1, :new-b 2} ;; The behavior when the second map contains a key not in the first is interesting. ;; I suspect you shouldn't depend on it. (Clojure 1.1 - no longer happens in 1.2.1) user=> (rename-keys {:a 1} {:b :new-b}) { :a 1, :new-b nil}
• link | changes

  ;; You need to be careful about key collisions.  You probably shouldn't 
  ;; depend on the exact behavior.
  user=> (rename-keys {:a 1 :b 2} {:a :b})
  {:b 1}
  
  user=> (rename-keys  {:a 1 :b 2}  {:a :b :b :a})
  {:a 1}
  
  ;; You can work around key collisions by using an array-map to control
  ;; the order of the renamings.
  user=> (rename-keys  {:a 1 :b 2 :c 3}  (array-map :a :tmp :b :a :tmp :b))
  {:b 1, :a 2, :c 3}
  

  ;; You need to be careful about key collisions. You probably shouldn't ;; depend on the exact behavior. user=> (rename-keys {:a 1 :b 2} {:a :b}) {:b 1} user=> (rename-keys {:a 1 :b 2} {:a :b :b :a}) {:a 1} ;; You can work around key collisions by using an array-map to control ;; the order of the renamings. user=> (rename-keys {:a 1 :b 2 :c 3} (array-map :a :tmp :b :a :tmp :b)) {:b 1, :a 2, :c 3}