# RangeExpression A type that can be used to slice a collection. ``` protocol RangeExpression ``` ## Overview A type that conforms to `RangeExpression` can convert itself to a `Range` of indices within a given collection. ## Topics ### Operators [`static func ~= (Self, Self.Bound) -> Bool`](/documentation/Swift/RangeExpression/~=(_:_:)) Returns a Boolean value indicating whether a value is included in a range. ### Associated Types [`associatedtype Bound : Comparable`](/documentation/Swift/RangeExpression/Bound) The type for which the expression describes a range. ### Instance Methods [`func contains(Self.Bound) -> Bool`](/documentation/Swift/RangeExpression/contains(_:)) Returns a Boolean value indicating whether the given element is contained within the range expression. [`func relative(to: C) -> Range`](/documentation/Swift/RangeExpression/relative(to:)) Returns the range of indices described by this range expression within the given collection. ## Relationships ### Conforming Types [`PartialRangeThrough`](/documentation/Swift/PartialRangeThrough) [`ClosedRange`](/documentation/Swift/ClosedRange) [`PartialRangeUpTo`](/documentation/Swift/PartialRangeUpTo) [`PartialRangeFrom`](/documentation/Swift/PartialRangeFrom) [`Range`](/documentation/Swift/Range) --- 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)