typealias Array.Indices
The type that represents the indices that are valid for subscripting an array, in ascending order.
昇順での、配列の添え字として有効なインデックスを表す型。
typealias Array.Iterator
The type that allows iteration over an array’s elements.
配列の持つ要素のすべてにわたる反復を許可する型。
typealias Array.ArrayLiteralElement
The type of the elements of an array literal.
配列リテラルの要素の型。
typealias Array.SubSequence
A collection representing a contiguous subrange of this collection’s elements. The subsequence shares indices with the original collection.