Declarative programming: Difference between revisions

Revision as of 23:44, 24 November 2024

Revision as of 10:54, 25 November 2024

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===Domain-specific languages===

{{main|Domain-specific language}}

Well-known examples of declarative ___domain-specific languages (DSLs) include the [[yacc]] parser generator input language, [[QML]], the [[Make (software)|Make]] build [[specification language]], [[Puppet (software)|Puppet]]'s configuration management language, [[regular expression]]s, [[Datalog]], [[answer set programming]] and a subset of [[SQL]] (SELECT queries, for example). DSLs have the advantage of being useful while not necessarily needing to be [[Turing-complete]], which makes it easier for a language to be purely declarative.

Many markup languages such as [[HTML]], [[MXML]], [[XAML]], [[XSLT]] or other [[user-interface markup language]]s are often declarative. HTML, for example, only describes what should appear on a webpage - it specifies neither [[control flow]] for rendering a page nor the page's possible [[human-computer interaction|interactions with a user]].