code / tomo-koans

   1 # Tables
   2 
   3 func main()
   4 
   5     # Tables store key-value pairs.
   6     # You can define a table using `{key: value, ...}`.
   7 
   8     scores := {"Alice": 100, "Bob": 200}
   9     assert scores == {"Alice": 100, "Bob": 200}
  10 
  11     assert scores["Alice"] == ???
  12 
  13     # Accessing a missing key gives `none`
  14     assert scores["Zoltan"] == ???
  15 
  16     # Tables can be empty but must have key and value types:
  17     empty : {Text:Int} = {}
  18     assert empty == {}
  19 
  20     # You can loop over tables:
  21     total := 0
  22     for name, score in scores
  23         total += score
  24 
  25     assert total == ???
  26 
  27     # Table keys and values can be accessed as an array:
  28     assert scores.keys == [???]
  29 
  30     assert scores.values == [???]
  31 
  32     # Table comprehensions let you create tables concisely:
  33     doubled := {k: v * 2 for k, v in scores}
  34     assert doubled == {???}