Boo (programming language)

Boo

Paradigm	Object oriented
Designed by	Rodrigo B. De Oliveira
Developer	Rodrigo B. De Oliveira
First appeared	2003; 18 years ago (2003)
Stable release	0.9.7 / 25 March 2013; 8 years ago (2013-03-25)
Typing discipline	static, strong, inferred, duck
Implementation language	C#
Platform	Common Language Infrastructure (.NET Framework & Mono)/
License	BSD 3-Clause[1]
Website	github.com/boo-lang
Influenced by
C#, Python
Influenced
Genie, Vala

Boo is an object-oriented, statically typed, general-purpose programming language that seeks to make use of the Common Language Infrastructure's support for Unicode, internationalization, and web applications, while using a Python-inspired syntax^[2] and a special focus on language and compiler extensibility. Some features of note include type inference, generators, multimethods, optional duck typing, macros, true closures, currying, and first-class functions.

Boo was one of the three scripting languages for the Unity game engine (Unity Technologies employed De Oliveira, its designer), until it was dropped in 2014 due to the small userbase.^[3] Despite official support for Boo ending, the language could still be used in Unity, until the Boo compiler was removed from the engine in 2017. ^[4]

Boo is free software released under the BSD 3-Clause license. It is compatible with the Microsoft .NET and Mono frameworks.

print "Hello World!"

def fib():
    a, b = 0L, 1L       # The 'L's make the numbers double word length (typically 64 bits)
    while true:
        yield b
        a, b = b, a + b

# Print the first 5 numbers in the series:
for index as int, element in zip(range(5), fib()):
    print("${index+1}: ${element}")