Instance Property


The position of the first element in a nonempty collection.



var startIndex: Self.Index { get }


If the collection is empty, startIndex is equal to endIndex.

See Also

Manipulating Indices

var endIndex: Self.Index

The collection’s “past the end” position—that is, the position one greater than the last valid subscript argument.


var indices: Self.Indices

The indices that are valid for subscripting the collection, in ascending order.

Required. Default implementation provided.

func index(after: Self.Index) -> Self.Index

Returns the position immediately after the given index.


func formIndex(inout Self.Index, offsetBy: Int)

Offsets the given index by the specified distance.

func formIndex(inout Self.Index, offsetBy: Int, limitedBy: Self.Index) -> Bool

Offsets the given index by the specified distance, or so that it equals the given limiting index.