This repository includes a work-in-progress reference manual and tutorial manual for the Objective-C programming language.
You can read it online at my GitHub Pages.
All parts to which I or the LLVM Project have the copyright to are licensed under Apache-2.0. All parts to which I hold the copyright to are additionally dual-licensed under GPL-3.0-or-later, GFDL-1.3-or-later, and CC-BY-3.0 or later.