Boo

Boo, short for Boo Programming Language, is a statically typed, object-oriented language with a Python-inspired syntax created by Rodrigo B. De Oliveira in 2003. Boo runs on the Common Language Runtime (CLR) and integrates seamlessly with the .NET ecosystem, allowing access to .NET libraries, frameworks, and tools. It can be downloaded and installed from the official repository at Boo Official Site, and programs are compiled and executed using the booc compiler included in the distribution.

Boo exists to combine the readability and expressiveness of Python-like syntax with the performance and strong typing of the .NET runtime. Its design philosophy emphasizes metaprogramming, macro support, and language extensibility, enabling developers to write concise, maintainable, and performant code while leveraging the full power of .NET libraries.

Boo: Variables and Functions

Boo uses def to declare functions and supports statically typed variables with optional type annotations.

# declare a typed variable
name as string = "Alice"
age as int = 30

# define a function

def greet(person as string):
print("Hello, ${person}")

Variables can have explicit types or rely on type inference. Functions use Python-like indentation, and Boo ensures type safety at compile time, while still allowing flexible, readable syntax.

Boo: Classes and Objects

Boo supports classes with constructors, methods, and inheritance, integrating smoothly with .NET objects.

class Person:
    def constructor(name as string, age as int):
        self.name = name
        self.age = age

def greet():
    print("Hi, I am ${self.name} and I am ${self.age} years old")

p as Person = Person("Alice", 30)
p.greet()

Classes in Boo allow encapsulation of state and behavior. They can extend .NET classes or implement interfaces, making Boo interoperable with existing .NET code.

Boo: Control Flow

Conditional statements in Boo use if, elif, and else, while loops use for and while.

if age >= 18:
    print("Adult")
else:
    print("Minor")

for i in range(1, 6):
print(i)

This structure supports readable, indentation-based syntax while maintaining static type checking and full .NET integration.

Boo: Macros and Metaprogramming

Boo includes macro support for code generation and metaprogramming.

macro printtwice(expr):
    print(expr)
    print(expr)

printtwice("Hello")

Macros allow developers to extend the language and inject reusable patterns at compile time, giving Boo expressive power beyond standard statically typed languages.

Boo is used for .NET application development where concise, readable syntax is desired along with strong typing and full CLR interoperability. It is suitable for scripting, utilities, and applications that leverage the .NET framework, and it shares paradigms with languages such as C#, F#, and IronPython.