Modern Object Pascal Introduction for Programmers – Castle Game Engine

In the modern iteration of Object Pascal, developers can expect to find a comprehensive set of features including classes, units, generics, interfaces, and more. The language is consistent and practical, making it an ideal choice for programmers with some programming experience. This book aims to provide a concise overview of the language while assuming prior knowledge of programming concepts.

When discussing the basics, the author focuses on the concept of a variable, a container for storing values that can change over time. The variable holds a name, and its value can be manipulated throughout the program. The author stresses the modern nature of Object Pascal, highlighting its similarities to other popular languages like C++, Java, and C#. It boasts a wide range of modern features and a robust ecosystem of tools and libraries.

Some notable tools include the Free Pascal Compiler (FPC) and the Lazarus IDE, both of which offer a portable and open-source compiler along with an accompanying library of visual components and a form designer. There is also a proprietary Delphi compiler and IDE available, as well as a plethora of libraries for both FPC and Delphi.

The author also showcases their own creation, Castle Game Engine, an open-source 3D and 2D game engine that utilizes modern Pascal to develop games across various platforms. To demonstrate the language's capabilities, the author provides a simple example of a command-line program that can be compiled and run using either FPC or Lazarus.

The rest of the article is dedicated to exploring the Object Pascal language, focusing on the command-line aspects without delving into more advanced features. The book aims to support both the Free Pascal Compiler (FPC) and Delphi, with a focus on the ObjFpc syntax mode recommended by FPC developers. The author acknowledges minor differences between compilers and between FPC ObjFpc mode and Delphi mode, but advises readers to be aware of these variations as they may encounter specific syntactical differences, such as the use of {$ifdef FPC} … {$endif} clauses in the examples.