;; This is inline comment (to the end of the line).

(; (1)
  This is block comment.
  block comment is keeping until the terminator -> ;) ;; (2)

(;
  (; These block comments can be nested. ;)
;)

0     ;; Fuzzy Numeric.  (default: Natural)
-1 +1 ;; Fuzzy Integer.  (default: Integer)
0.0   ;; Fuzyy Decimal.  (default: Decimal)
1/2   ;; Rational.
'a'   ;; Charactor.      (same as Uint32)
""    ;; Fuzzy Text.     (default: String_UTF8)
:key  ;; Keyword.
[]    ;; Fuzzy Sequence. (default: List)
{}    ;; Key-Value Map.

;; Declare procedure or constant value or variable value.
(dec x Integer)

;; Declare a constant value once.
(val x 1000)

;; Declare a mutable variable value.
(var y 0)

;; Strictly typing with literal.
(val z (as 0 Uint8))
(var w (as "something" Bytes))

;; Reassign
(set! y 1000)    ;; OK
(set! y "hello") ;; Can't. `y` has been declered as Number type.
(set! x 10)      ;; Can't. `x` has been declered as immutable.

;; Simply calling a procedure.
(foo a b c)

;; Calling closure.
((=> (a) (* a a)) 10) ;; returns 100

;; Declare a procedure
(dec cubic (-> Number Number)) ;;(1)

;; Define the procedure
(def (cubic x) (* x x x))