Collection
protocol Collection : Sequence
-
Mechanica
Returns the first index where the specified value appears in the collection. After using firstIndex(of:) to find the last position of a particular element in a collection, you can use it to access the element by subscripting.
Note
Same asindex(of:)
.See also
index(of:)
Declaration
Swift
public func firstIndex(of element: Element) -> Self.Index?
-
Mechanica
Returns the last index where the specified value appears in the collection. After using lastIndex(of:) to find the last position of a particular element in a collection, you can use it to access the element by subscripting.
Declaration
Swift
public func lastIndex(of element: Element) -> Self.Index?
-
Mechanica
Declaration
Swift
public func at(_ index: Int) -> Element?
Return Value
The element at a given index or nil if not exists. Example:
let array = [1, 2, 3] array[100] -> crash array.at(100) -> nil
-
Mechanica
Returns a random element from
self
.Declaration
Swift
public func random() -> Element