type
[]T (slices)
[]T
[]T is a growable slice of T — a pointer to a header that holds the data, its length, and its capacity. Create one with new []T, append with push(slice, value) (the storage doubles when it is full), count elements with len(slice), and read or write an element with slice[index]. Because the header never moves, an append is visible to everything holding that slice, giving it reference semantics. Slices are the everyday dynamic collection for records and other values outside the ECS.
Example
let route: []Waypoint = new []Waypoint
push(route, new Waypoint)
for step in 0 .. len(route) { Screen.put_pixel(x: route[step].column, y: route[step].row, color: Color.Gold) }