Ranges
Range expressions produce arrays of integers from some start up to (or down to) some limit:
def ints = 1..<10> ints[1, 2, 3, 4, 5, 6, 7, 8, 9]In the expression above, the upper limit is not included. Inclusive ranges are also supported:
def ints_inclusive = 1...10> ints_inclusive[1, 2, 3, 4, 5, 6, 7, 8, 9, 10]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[1, 3, 5, 7, 9]If we want a descending range, we must provide a second element:
def ints_descending = 10..9...0> ints_descending[10, 9, 8, 7, 6, 5, 4, 3, 2, 1, 0]An exclusive descending range is also possible:
def ints_descending_exclusive = 10..9..>0> ints_descending_exclusive[10, 9, 8, 7, 6, 5, 4, 3, 2, 1]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.