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{{Programming paradigms}}
{{Notability|date=July 2022}}
An '''expression-oriented programming language''' is a [[programming language]] in which every (or nearly every) construction is an [[expression (computer science)|expression]] and thus yields a value. The typical exceptions are [[macro (computer science)|macro]] definitions, [[preprocessor]] commands, and [[declaration (computer programming)|declarations]], which expression-oriented languages often treat as [[statement (computer science)|statements]].
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==Criticism and prevention==
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{{See also|Assignment (computer science)#Assignment versus equality|Relational operator#Confusion with assignment operators}}
Critics, including language designers,<ref>[https://www.oracle.com/java/technologies/javase/codeconventions-programmingpractices.html#547 Java Code Conventions "10.4 Variable Assignments"]</ref>{{Failed verification}} blame expression-orientation for an entire class of [[software bug|programming mistakes]] wherein a programmer accidentally codes an [[assignment (computer science)|assignment]] ''expression'', which replaces a variable with an expression rather than testing it for [[equality (relational operator)|equality]] with that expression.
The designers of [[Ada (programming language)|Ada]] and [[Java (programming language)|Java]] prevent this type of mistake by restricting [[conditional (computer programming)|control expressions]] to those that evaluate strictly to the [[boolean data type]].<ref>[https://docs.oracle.com/javase/specs/jls/se8/html/jls-14.html#jls-14.9 The Java Language Specification, Java SE 8 Edition "14.9 The if Statement"]</ref><ref>[https://www.adaic.org/learn/materials/intro/part4/ Introducing Ada]</ref>
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==Examples==
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*[[ALGOL 68]]
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