Introduction

NeoObjectPascal is a modern programming language inspired by Object Pascal, with a clean and familiar syntax but equipped with contemporary features: full object orientation, a native testing framework, error handling with try/catch/finally, native arrays, functional programming, and direct integration with Java.

It is interpreted by a runtime written in Java (with ANTLR4), which brings two advantages: JVM portability and the ability to embed Java code directly in your program when you need something only the Java ecosystem offers.

Philosophy

• Easy to learn — the Pascal-style syntax is explicit and readable, great for beginners.
• Powerful — object orientation, testing, mocking, JSON/CSV manipulation, and the pipe operator let you write concise, expressive code.
• Modern — arrays, for..in, Real arithmetic, boolean operators, and error handling make code robust and easy to maintain.

A first look

// A complete program in NeoObjectPascal
class Pessoa
    var nome: String;

    constructor Create(n: String)
    begin
        self.nome := n;
    end;

    public function saudar(): String
    begin
        return "Olá, eu sou " + self.nome;
    end;
end;

var p: Object;

begin
    p := new Pessoa("Alice");
    WriteLn(p.saudar());
end.

Saída

 Olá, eu sou Alice 

What you'll learn in this guide

• Write and run your first programs.
• Declare variables and use the Integer, String, Boolean, Real, Object, and Array types.
• Use control structures: if, while, for, and for..in.
• Create functions, procedures, and classes with inheritance, interfaces, and polymorphism.
• Handle errors with try/catch/finally and raise.
• Organize code into modules with uses and use the internal libraries.
• Write unit tests and mocks with the native framework.
• Integrate Java code and run in the cloud.

Ready to start?

Head over to Installation and your first program and get the interpreter running.