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Family Day update

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Ingy döt Net 2020-02-17 23:21:07 -08:00
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Task/Extend-your-language/00DESCRIPTION
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{{Control Structures}}{{omit from|BBC BASIC}}
{{Control Structures}}
Some programming languages allow you to [[wp:Extensible_programming|extend]] the language. While this can be done to a certain degree in most languages (e.g. by using macros), other languages go much further. Most notably in the Forth and Lisp families, programming per se is done by extending the language without any formal distinction between built-in and user-defined elements.
If your language supports it, show how to introduce a new flow control mechanism. A practical and useful example is a four-way branch: