Variables: Dak Tour

; Dak supports the standard declarations as you would expect.
(var answer 42)
(const name "deep thought")
(let machine {:planet :earth})
(prn answer name machine.planet)

; Set can be used to alter the values (where allowed):
(set answer 43)
(set machine.planet :destroyed)
(prn answer name machine.planet)

; Property access works using dot as shown above.
; For dynamic property names, the dot operator can be used.
(let prop-name :planet)
(prn (. machine prop-name))
(set (. machine prop-name) :destroyed)

; Typically in Lisps a let block is prefered to scope variables.
(let [author "Adams"
      programmer "Lunkwill"]
  (prn author programmer))

; You might have noticed prop-name above is an identifier
; that is otherwise invalid. Dak allows for a range of
; additional characters. Remember, these get transpiled into
; compatible names, so they are not meant for code that will
; interoperate with JavaScript.
(let [is-true? true
      bad! false
      in> 0
      out< 1]
  (prn is-true? bad! in> out<))