#82: Partial Ranges in Swift

Swift supports ranges with only one bound, which are especially handy when slicing collections.

let values = [10, 20, 30, 40, 50]
values[..<2]   // [10, 20]
values[2...]   // [30, 40, 50]
values[...2]   // [10, 20, 30]

These are called partial ranges and they make slicing code pleasantly compact.

You will see them often when working with strings and arrays.