Returns the first index where the specified value appears in the collection.
This declaration has been renamed to Collection.firstIndex(of:).
This declaration was deprecated in Swift 5.0.
func index(of element: Self.Element) -> Self.Index? where Self.Element:Equatableimport Swiftprotocol Collection<Element> : SequenceA sequence whose elements can be traversed multiple times, nondestructively, and accessed by an indexed subscript.
func firstIndex(of element: Self.Element) -> Self.Index? Returns the first index where the specified value appears in the collection.
associatedtype Element where Self.Element == Self.Iterator.ElementA type representing the sequence’s elements.
associatedtype Index : Comparable where Self.Index == Self.Indices.Element, Self.Indices.Element == Self.Indices.Index, Self.Indices.Index == Self.SubSequence.IndexA type that represents a position in the collection.
protocol EquatableA type that can be compared for value equality.
func indices(of element: Self.Element) -> RangeSet<Self.Index> Returns the indices of all the elements that are equal to the given element.
func split(separator: Self.Element, maxSplits: Int = Int.max, omittingEmptySubsequences: Bool = true) -> [Self.SubSequence] Returns the longest possible subsequences of the collection, in order, around elements equal to the given element.