An interval from a lower bound up to, and including, an upper bound.

    @frozen struct ClosedRange<Bound> where Bound : Comparable


    You create a ClosedRange instance by using the closed range operator (...).

    let throughFive = 0...5

    A ClosedRange instance contains both its lower bound and its upper bound.

    // true
    // false
    // true

    Because a closed range includes its upper bound, a closed range whose lower bound is equal to the upper bound contains that value. Therefore, a ClosedRange instance cannot represent an empty range.

    let zeroInclusive = 0...0
    // true
    // false

    Using a Closed Range as a Collection of Consecutive Values

    When a closed range uses integers as its lower and upper bounds, or any other type that conforms to the Strideable protocol with an integer stride, you can use that range in a for-in loop or with any sequence or collection method. The elements of the range are the consecutive values from its lower bound up to, and including, its upper bound.

    for n in 3...5 {
    // Prints "3"
    // Prints "4"
    // Prints "5"

    Because floating-point types such as Float and Double are their own Stride types, they cannot be used as the bounds of a countable range. If you need to iterate over consecutive floating-point values, see the stride(from:through:by:) function.



    • typealias Element

      A type representing the sequence’s elements.

    • typealias Iterator

      A type that provides the sequence’s iteration interface and encapsulates its iteration state.

    • typealias SubSequence

      A collection representing a contiguous subrange of this collection’s elements. The subsequence shares indices with the original collection.


    Instance Subscripts

    Instance Properties

    Instance Methods

    Type Operators


    • enum Index

      A type that represents a position in the collection.

    Removed Members


    • init(ClosedRange<Bound>)

      Now that Range is conditionally a collection when Bound: Strideable, CountableRange is no longer needed. This is a deprecated initializer for any remaining uses of Range(countableRange).