code / tomo-koans

   1 # Structs and Methods
   2 
   3 # The keyword `struct` is used to define structures
   4 # that hold multiple members:
   5 struct Point(x:Int, y:Int)
   6 
   7     # Methods are any function defined inside of the
   8     # indented area below a struct definition.
   9 
  10     # There is no implicit `self` argument, only the
  11     # arguments you explicitly define.
  12     func abs(p:Point -> Point)
  13         return Point(p.x.abs(), p.y.abs())
  14     
  15     # Constants can be declared inside of a struct's namespace:
  16     ZERO := Point(0, 0)
  17 
  18     # Arbitrary functions can also be defined here:
  19     func squared_int(x:Int -> Int)
  20         return x * x
  21 
  22 func main()
  23 
  24     # You can create a struct instance like this:
  25     p := Point(x=3, y=-4)
  26 
  27     assert p == Point(x=???, y=???)
  28 
  29     assert Point.ZERO == Point(x=???, y=???)
  30 
  31     assert p.x == ???
  32     assert p.y == ???
  33 
  34     assert p.abs() == ???
  35 
  36     assert Point.squared_int(5) == ???