StructureSwift

    Range

    A half-open interval from a lower bound up to, but not including, an upper bound.

    @frozen struct Range<Bound> where Bound : Comparable

    Overview

    You create a Range instance by using the half-open range operator (..<).

    let underFive = 0.0..<5.0

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

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

    Range instances can represent an empty interval, unlike ClosedRange.

    let empty = 0.0..<0.0
empty.contains(0.0)
// false
empty.isEmpty
// true

    Using a Range as a Collection of Consecutive Values

    When a 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, but not including, its upper bound.

    for n in 3..<5 {
    print(n)
}
// Prints "3"
// Prints "4"

    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:to:by:) function.

    Members

    Typealiases

    • typealias Element

      A type representing the sequence’s elements.

    • typealias Index

      A type that represents a position in the range.

    • typealias Indices

      A type that represents the indices that are valid for subscripting the collection, in ascending order.

    • 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.

    Initializers

    Foundation

    Instance Subscripts

    Instance Properties

    RegexParser

    Instance Methods

    Markdown

    Type Operators

    Conforms To

    Removed Members

    Initializers

    • init(Range<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).

    Markdown

    Instance Properties

      Markdown