Apple Inc.

Apple Inc. is the author of "The Swift Programming Language," which serves as the official guide to the Swift programming language.

As a technology company known for its innovative products and software ecosystems, Apple developed Swift as a modern, safe, and fast programming language for iOS, macOS, watchOS, and tvOS applications.

The company's decision to create and maintain this comprehensive language guide demonstrates their commitment to supporting developers within their ecosystem.

By providing this resource, Apple aims to facilitate the adoption and mastery of Swift among programmers interested in creating applications for Apple platforms.