A Collection whose elements consist of those in a Base Collection passed through a transform function returning Element. These elements are computed lazily, each time they’re read, by calling the transform function on a base element.
typealias LazyMapCollection<T, U> = LazyMapSequence<T, U> where T : Collectionimport Swift@frozen struct LazyMapSequence<Base, Element> where Base : SequenceA Sequence whose elements consist of those in a Base Sequence passed through a transform function returning Element. These elements are computed lazily, each time they’re read, by calling the transform function on a base element.
protocol Collection<Element> : SequenceA sequence whose elements can be traversed multiple times, nondestructively, and accessed by an indexed subscript.