# RandomAccessCollection Implementations ## Topics ### Instance Properties [`var endIndex: EmptyCollection.Index`](/documentation/Swift/EmptyCollection/endIndex) Always zero, just like `startIndex`. [`var indices: Range`](/documentation/Swift/EmptyCollection/indices-swift.property) The indices that are valid for subscripting the collection, in ascending order. [`var startIndex: EmptyCollection.Index`](/documentation/Swift/EmptyCollection/startIndex) Always zero, just like `endIndex`. ### Instance Methods [`func distance(from: EmptyCollection.Index, to: EmptyCollection.Index) -> Int`](/documentation/Swift/EmptyCollection/distance(from:to:)) The distance between two indexes (always zero). [`func index(EmptyCollection.Index, offsetBy: Int) -> EmptyCollection.Index`](/documentation/Swift/EmptyCollection/index(_:offsetBy:)) Returns an index that is the specified distance from the given index. [`func index(EmptyCollection.Index, offsetBy: Int, limitedBy: EmptyCollection.Index) -> EmptyCollection.Index?`](/documentation/Swift/EmptyCollection/index(_:offsetBy:limitedBy:)) Returns an index that is the specified distance from the given index, unless that distance is beyond a given limiting index. [`func index(after: EmptyCollection.Index) -> EmptyCollection.Index`](/documentation/Swift/EmptyCollection/index(after:)) Always traps. [`func index(before: EmptyCollection.Index) -> EmptyCollection.Index`](/documentation/Swift/EmptyCollection/index(before:)) Always traps. ### Subscripts [`subscript(EmptyCollection.Index) -> Element`](/documentation/Swift/EmptyCollection/subscript(_:)-1wkfh) Accesses the element at the given position. [`subscript(Range.Index>) -> EmptyCollection.SubSequence`](/documentation/Swift/EmptyCollection/subscript(_:)-5fxf8) Accesses a contiguous subrange of the collection’s elements. ### Type Aliases [`typealias Index`](/documentation/Swift/EmptyCollection/Index) A type that represents a valid position in the 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)