Editing Guard (computer science) (section)

== Terminology ==
The term is used with specific meaning in [[APL (programming language)|APL]], [[Haskell (programming language)|Haskell]], [[Clean programming language|Clean]], [[Erlang programming language|Erlang]], [[Occam (programming language)|occam]], [[Promela]], [[OCaml]], [[Swift (programming language)|Swift]],<ref>{{Cite web
| url = http://nshipster.com/guard-and-defer/
| title = guard & defer
| last = Cook
| first = Nate
| website = NSHipster
| access-date = 2016-02-26
}}</ref> [[Python (programming language)|Python]] from version 3.10, and [[Scala (programming language)|Scala]] programming languages.{{Citation needed|date=March 2012}} In [[Mathematica]], guards are called ''constraints''. Guards are the fundamental concept in [[Guarded Command Language]], a language in [[formal methods]]. Guards can be used to augment [[pattern matching]] with the possibility to skip a pattern even if the structure matches. Boolean expressions in [[Conditional (programming)|conditional statement]]s usually also fit this definition of a guard although they are called ''conditions''.