# Collection Implementations ## Topics ### Instance Properties [`var endIndex: Range.Index`](/documentation/Swift/Range/endIndex) The collection’s “past the end” position—that is, the position one greater than the last valid subscript argument. [`var indices: Range.Indices`](/documentation/Swift/Range/indices-swift.property) The indices that are valid for subscripting the range, in ascending order. [`var startIndex: Range.Index`](/documentation/Swift/Range/startIndex) The position of the first element in a nonempty collection. ### Instance Methods [`func distance(from: Range.Index, to: Range.Index) -> Int`](/documentation/Swift/Range/distance(from:to:)) Returns the distance between two indices. [`func index(Range.Index, offsetBy: Int) -> Range.Index`](/documentation/Swift/Range/index(_:offsetBy:)) Returns an index that is the specified distance from the given index. [`func index(after: Range.Index) -> Range.Index`](/documentation/Swift/Range/index(after:)) Returns the position immediately after the given index. ### Subscripts [`subscript(Range.Index>) -> Range`](/documentation/Swift/Range/subscript(_:)-358vm) Accesses the subsequence bounded by the given range. [`subscript(Range.Index) -> Range.Element`](/documentation/Swift/Range/subscript(_:)-84ykx) Accesses the element at specified position. ### Type Aliases [`typealias Index`](/documentation/Swift/Range/Index) A type that represents a position in the range. [`typealias Indices`](/documentation/Swift/Range/Indices-swift.typealias) A type that represents the indices that are valid for subscripting the collection, in ascending order. [`typealias SubSequence`](/documentation/Swift/Range/SubSequence) A collection representing a contiguous subrange of this collection’s elements. The subsequence shares indices with the original collection. --- Copyright © 2026 Apple Inc. All rights reserved. | [Terms of Use](https://www.apple.com/legal/internet-services/terms/site.html) | [Privacy Policy](https://www.apple.com/privacy/privacy-policy)