Ranges
Range expressions produce arrays of integers from some start up to (or down to) some limit:
def ints = 1..<10> ints[1i32, 2i32, 3i32, 4i32, 5i32, 6i32, 7i32, 8i32, 9i32]In the expression above, the upper limit is not included. Inclusive ranges are also supported:
def ints_inclusive = 1...10> ints_inclusive[1i32, 2i32, 3i32, 4i32, 5i32, 6i32, 7i32, 8i32, 9i32, 10i32]By default the distance between each number is 1 (the stride). This can be changed by providing an explicit second element:
def ints_by_two = 1..3..<10> ints_by_two[1i32, 3i32, 5i32, 7i32, 9i32]If we want a descending range, we must provide a second element:
def ints_descending = 10..9...0> ints_descending[10i32, 9i32, 8i32, 7i32, 6i32, 5i32, 4i32, 3i32, 2i32, 1i32, 0i32]An exclusive descending range is also possible:
def ints_descending_exclusive = 10..9..>0> ints_descending_exclusive[10i32, 9i32, 8i32, 7i32, 6i32, 5i32, 4i32, 3i32, 2i32, 1i32]Hints
The predefined functions iota and indices encapsulate common
usages of ranges.
Instead of 0..<x, use iota x.
Instead of iota (length A) (or 0..<length A), use indices A.