code / tomo-koans

   1 # Arrays
   2 
   3 func main()
   4 
   5     # Arrays are ordered collections of values.
   6     # You can define an array using `[...]`:
   7 
   8     nums := [10, 20, 30]
   9 
  10     # Arrays are 1-indexed.
  11     assert nums[2] == ???
  12 
  13     # Arrays can be empty but must have a type:
  14     empty : [Int] = []
  15 
  16     assert empty == []
  17 
  18     # You can loop over an array with `for value in array`:
  19     sum := 0
  20     for num in nums
  21         sum += num
  22 
  23     assert sum == ???
  24 
  25     # Array comprehensions let you transform arrays concisely:
  26     squares := [n*n for n in nums]
  27 
  28     assert squares == [???, ???, ???]
  29 
  30     # You can also get the index with `for index, value in array`:
  31     for i, num in nums
  32         assert squares[i] == num * num