# AnyColumnSlice A type-erased column slice. ``` struct AnyColumnSlice ``` ## Topics ### Inspecting a Type-Erased Column Slice [`var name: String`](/documentation/TabularData/AnyColumnSlice/name) The name of the slice’s parent column. [`var count: Int`](/documentation/TabularData/AnyColumnSlice/count) The number of elements in the column slice. [`var missingCount: Int`](/documentation/TabularData/AnyColumnSlice/missingCount) The number of missing elements in the column slice. [`var wrappedElementType: any Any.Type`](/documentation/TabularData/AnyColumnSlice/wrappedElementType) The underlying type of the column’s elements. [`func isNil(at: Int) -> Bool`](/documentation/TabularData/AnyColumnSlice/isNil(at:)) Returns a Boolean that indicates whether the element at the index is missing. ### Converting to a Typed Column Slice [`func assumingType(T.Type) -> DiscontiguousColumnSlice`](/documentation/TabularData/AnyColumnSlice/assumingType(_:)) Returns a slice of the underlying typed column. ### Accessing Elements [`subscript(Int) -> Any?`](/documentation/TabularData/AnyColumnSlice/subscript(_:)-g0gb) Accesses an element at an index. [`subscript(Range) -> AnyColumnSlice`](/documentation/TabularData/AnyColumnSlice/subscript(_:)-3qisq) Accesses a contiguous range of elements. ### Creating a Slice of Unique Elements [`func distinct() -> AnyColumnSlice`](/documentation/TabularData/AnyColumnSlice/distinct()) Generates a column slice that contains unique elements. ### Summarizing a Column Slice [`func summary() -> AnyCategoricalSummary`](/documentation/TabularData/AnyColumnSlice/summary()) Generates a categorical summary of the column slice’s elements. ### Describing a Column Slice [`var description: String`](/documentation/TabularData/AnyColumnSlice/description) A text representation of the column slice. [`var debugDescription: String`](/documentation/TabularData/AnyColumnSlice/debugDescription) A text representation of the column slice suitable for debugging. [`var customMirror: Mirror`](/documentation/TabularData/AnyColumnSlice/customMirror) A mirror that reflects the column slice. ### Comparing Two Column Slices [`static func == (AnyColumnSlice, AnyColumnSlice) -> Bool`](/documentation/TabularData/AnyColumnSlice/==(_:_:)) Returns a Boolean that indicates whether the column slices are equal. ### Hashing a Column Slice [`func hash(into: inout Hasher)`](/documentation/TabularData/AnyColumnSlice/hash(into:)) Hashes the essential components of the column slice by feeding them into a hasher. ### Invoking Protocol Methods ### Default Implementations [CustomDebugStringConvertible Implementations](/documentation/TabularData/AnyColumnSlice/CustomDebugStringConvertible-Implementations) [CustomReflectable Implementations](/documentation/TabularData/AnyColumnSlice/CustomReflectable-Implementations) [CustomStringConvertible Implementations](/documentation/TabularData/AnyColumnSlice/CustomStringConvertible-Implementations) [Equatable Implementations](/documentation/TabularData/AnyColumnSlice/Equatable-Implementations) [Hashable Implementations](/documentation/TabularData/AnyColumnSlice/Hashable-Implementations) [RandomAccessCollection Implementations](/documentation/TabularData/AnyColumnSlice/RandomAccessCollection-Implementations) ## Relationships ### Conforms To [`CustomStringConvertible`](/documentation/Swift/CustomStringConvertible) [`Hashable`](/documentation/Swift/Hashable) [`Sequence`](/documentation/Swift/Sequence) [`CustomDebugStringConvertible`](/documentation/Swift/CustomDebugStringConvertible) [`RandomAccessCollection`](/documentation/Swift/RandomAccessCollection) [`BidirectionalCollection`](/documentation/Swift/BidirectionalCollection) [`Collection`](/documentation/Swift/Collection) [`Copyable`](/documentation/Swift/Copyable) [`Escapable`](/documentation/Swift/Escapable) [`MutableCollection`](/documentation/Swift/MutableCollection) [`Equatable`](/documentation/Swift/Equatable) [`AnyColumnProtocol`](/documentation/TabularData/AnyColumnProtocol) [`CustomReflectable`](/documentation/Swift/CustomReflectable) --- 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)