Slices

Use ranges to slice lists. Ranges can be inclusive or exclusive. Negative indices count from the end of the list.

let my_list = [0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100]

// Exclusive range: 3 to 6 (does not include index 6)
assert_eq([30, 40, 50], my_list[3..6]);

// Inclusive range: 3 to 6 (includes index 6)
assert_eq([30, 40, 50, 60], my_list[3..=6]);

// Negative indices: Counting from the end of the list
assert_eq([80, 90], my_list[-3..-1]);

A range whose start lands after its end (for example my_list[6..3]) is out of bounds and raises an error rather than returning a reversed or empty slice. This holds for lists, strings, tuples and deques alike.