protocol MutableIndexable A type that supports subscript assignment to a mutable collection. Inheritance View Protocol Hierarchy → Associated Types Index : ForwardIndexType Import import Swift Instance Variables var endIndex: Self.Index Required Declaration var endIndex: Self.Index { get } var startIndex: Self.Index Required Declaration var startIndex: Self.Index { get } Subscripts subscript(_: Self.Index) Required Declaration subscript(position: Self.Index) -> Self._Element { get set }