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((Short description|none))
((More citations needed|date=July 2011))
((Infobox programming language
| name                   = Boo
| logo                   = [[File:BooLogo.png]]
| paradigm               = [[Object-oriented analysis and design|Object oriented]]
| year                   = ((Start date and age|2003))
| designer               = Rodrigo B. De Oliveira
| developer              = Mason Wheeler
| latest_release_version = 0.9.7
| latest_release_date    = ((Start date and age|2013|03|25|df=y))
| typing                 = [[static typing|static]], [[strong typing|strong]], [[Type inference|inferred]], [[duck typing|duck]]
| implementations        = 
| dialects               = 
| influenced_by          = [[C Sharp (programming language)|C#]], [[Python (programming language)|Python]]
| influenced             = [[Genie (programming language)|Genie]], [[Vala (programming language)|Vala]]
| programming_language   = [[C Sharp (programming language)|C#]]
| platform               = [[Common Language Infrastructure]] ([[.NET Framework]] & [[Mono (software)|Mono]])/
| license                = [[BSD licenses|BSD 3-Clause]]<ref>((cite web |url=https://github.com/bamboo/boo/blob/master/license.txt |title=license.txt |access-date=August 5, 2015 |website=github.com))</ref>
| website                = ((URL|https://github.com/boo-lang))
))

'''Boo''' is an [[Object oriented programming|object-oriented]], [[Type system#Static typing|statically typed]], [[general-purpose programming language]] that seeks to make use of the [[Common Language Infrastructure]]'s support for [[Unicode]], [[I18n|internationalization]], and web applications, while using a [[Python (programming language)|Python]]-inspired syntax<ref>((cite web |url=http://boo.codehaus.org/BooManifesto.pdf |title=The boo Programming Language |author=Rodrigo Barreto de Oliveira |year=2005 |access-date=February 22, 2009 |url-status=dead |archive-url=https://web.archive.org/web/20090206045607/http://boo.codehaus.org/BooManifesto.pdf |archive-date=February 6, 2009))</ref> and a special focus on language and compiler extensibility. Some features of note include [[type inference]], [[generator (computer science)|generators]], [[multimethods]], optional [[duck typing]], [[Macro (computer science)|macros]], true [[Closure (computer science)|closures]], [[currying]], and [[first-class function]]s.

Boo was one of the three scripting languages for the [[Unity (game engine)|Unity game engine]] ([[Unity Technologies]] employed De Oliveira, its designer), until official support was dropped in 2014 due to the small userbase.<ref>((cite web |url=https://blogs.unity3d.com/2014/09/03/documentation-unity-scripting-languages-and-you/ |title=Documentation, Unity scripting languages and you |author=aleksandr |date=September 3, 2014 |website=Unity Blogs))</ref> The Boo Compiler was removed from the engine in 2017.<ref>((cite web |url=https://blogs.unity3d.com/2017/08/11/unityscripts-long-ride-off-into-the-sunset/ |title=UnityScript's long ride off into the sunset |author=Richard Fine |date=August 11, 2017 |website=Unity Blogs))</ref> Boo has since been abandoned by De Oliveira, with development being taken over by Mason Wheeler.<ref>((cite web |url=https://github.com/boo-lang/boo/issues/201 |title=State of Boo · Issue #201 · boo-lang/boo |date=October 2, 2019 |website=GitHub |access-date=January 19, 2023))</ref>

Boo is [[free software]] released under the [[BSD licenses|BSD 3-Clause license]]. It is compatible with the [[Microsoft]] [[.NET Framework|.NET]] and [[Mono (software)|Mono]] frameworks.

== Syntax ==
((rewrite|2=section|date=May 2023))

<syntaxhighlight lang="boo">
print ("Hello World")
</syntaxhighlight>

<syntaxhighlight lang="boo">
def fib():
    a, b = 0L, 1L   h
    # 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}")
</syntaxhighlight>

== See also ==
((Portal|Free and open-source software))
* [[Fantom (programming language)|Fantom]]
* [[Groovy (programming language)|Apache Groovy]]
* [[IronPython]]
* [[IronRuby]]
* [[Nemerle]]
* [[REBOL]]
* [[StaDyn (programming language)|StaDyn]]

==References==
((Reflist))

== External links ==

* [https://github.com/boo-lang/boo Official website]
* [http://jbryankelly.files.wordpress.com/2012/07/thinksciboorev2_hb.pdf How To Think Like a Computer Scientist: Learning to Program with Boo]
* [https://docs.google.com/file/d/0B8oSXKT4_sy7ZERmYnozaFlTY2M/edit?usp=sharing.pdf Boo Succinctly Revealed]
* [https://web.archive.org/web/20140521221019/http://protoman.net/index.php?p=bootorial%2Findex Bootorial]

((Common Language Infrastructure))

[[Category:Programming languages]]
[[Category:.NET programming languages]]
[[Category:Brazilian inventions]]
[[Category:Class-based programming languages]]
[[Category:Free compilers and interpreters]]
[[Category:Object-oriented programming languages]]
[[Category:Procedural programming languages]]
[[Category:Programming languages created in 2003]]
[[Category:Software using the BSD license]]
[[Category:Statically typed programming languages]]
[[Category:2003 software]]

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