Modern Object Pascal Introduction for Programmers – Castle Game Engine

This is a concise, practical introduction to modern Object Pascal aimed at programmers who already know other languages. It argues that Pascal has evolved into a "modern" language with classes, generics, interfaces, units and other features comparable to C++, Java or C#, while remaining compiled to fast native code and offering strong type safety plus optional low-level control. The text promotes the Free Pascal Compiler (FPC), Lazarus IDE and Delphi, describes the active ecosystem (libraries, tooling, VS Code support) and highlights the author's Castle Game Engine as a real-world consumer of modern Pascal for cross-platform 2D/3D game development (Windows, Linux, macOS, mobile, consoles and WebGL).

The material systematically covers language basics and advanced topics: a minimal hello-world program, compiler syntax modes (FPC ObjFpc vs Delphi), functions/procedures (Result, Exit), control structures, units and initialization, classes and inheritance (constructors, destructors, properties, visibility), memory management and freeing patterns, exceptions, run-time library features (streams, generics, containers), callbacks, anonymous functions, records, operator overloading, class helpers and interfaces (including reference-counting). Examples and small code snippets illustrate important specifics such as FPC directives, integer vs float division, recursive calls, and how to write code compatible with both compilers.