4 Examples top

• link | changes

  user=> (get [1 2 3] 1)
  2
  user=> (get [1 2 3] 5)
  nil
  user=> (get {:a 1 :b 2} :b)
  2
  user=> (get {:a 1 :b 2} :z "missing")
  "missing"
  
  

  user=> (get [1 2 3] 1) 2 user=> (get [1 2 3] 5) nil user=> (get {:a 1 :b 2} :b) 2 user=> (get {:a 1 :b 2} :z "missing") "missing"
• link | changes

  ;; to get an index of the element of a vector, use .indexOf
  user=> (def v ["one" "two" "three" "two"])
  #'user/v
  
  user=> (.indexOf v "two")
  1
  
  user=> (.indexOf v "foo")
  -1
  

  ;; to get an index of the element of a vector, use .indexOf user=> (def v ["one" "two" "three" "two"]) #'user/v user=> (.indexOf v "two") 1 user=> (.indexOf v "foo") -1
• link | changes

  user=> (get (System/getenv) "SHELL")
  "/bin/bash"
  
  user=> (get (System/getenv) "PATH")
  "/usr/local/bin:/sbin:/usr/sbin:/usr/bin:/bin"

  user=> (get (System/getenv) "SHELL") "/bin/bash" user=> (get (System/getenv) "PATH") "/usr/local/bin:/sbin:/usr/sbin:/usr/bin:/bin"
• link | changes

  ;; 'get' is not the only option
  user=> (def my-map {:a 1 :b 2 :c 3})
  
  ;; maps act like functions
  user=> (my-map :a)
  1
  
  ;; even keys act like functions
  user=> (:b my-map)
  2

  ;; 'get' is not the only option user=> (def my-map {:a 1 :b 2 :c 3}) ;; maps act like functions user=> (my-map :a) 1 ;; even keys act like functions user=> (:b my-map) 2