PartialRangeUpTo

    A partial half-open interval up to, but not including, an upper bound.

    @frozen struct PartialRangeUpTo<Bound> where Bound : Comparable

    You create PartialRangeUpTo instances by using the prefix half-open range operator (prefix ..<).

    let upToFive = ..<5.0

    You can use a PartialRangeUpTo instance to quickly check if a value is contained in a particular range of values. For example:

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

    You can use a PartialRangeUpTo instance 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]
    print(numbers[..<3])
    // Prints "[10, 20, 30]"

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    • protocol ExpectedCount

      A protocol that describes a range expression that can be used with confirmation(_:expectedCount:isolation:sourceLocation:_:).