Returns a partial range up to, but not including, its upper bound.


prefix static func ..< (maximum: String) -> PartialRangeUpTo<String>



The upper bound for the range.


Use the prefix half-open range operator (prefix ..<) to create a partial range of any type that conforms to the Comparable protocol. This example creates a PartialRangeUpTo<Double> instance that includes any value less than 5.0.

let upToFive = ..<5.0

upToFive.contains(3.14)       // true
upToFive.contains(6.28)       // false
upToFive.contains(5.0)        // false

You can use this type of partial range of a collection’s indices to represent the range from the start of the collection up to, but not including, the partial range’s upper bound.

let numbers = [10, 20, 30, 40, 50, 60, 70]
// Prints "[10, 20, 30]"

See Also

Creating a Range Expression

static func ..< (String, String) -> Range<String>

Returns a half-open range that contains its lower bound but not its upper bound.

static func ... (String, String) -> ClosedRange<String>

Returns a closed range that contains both of its bounds.

static func ... (String) -> PartialRangeThrough<String>

Returns a partial range up to, and including, its upper bound.

static func ... (String) -> PartialRangeFrom<String>

Returns a partial range extending upward from a lower bound.