An expression-oriented programming language is a programming language where every (or nearly every) construction is an expression and thus yields a value. The typical exceptions are macro definitions, preprocessor commands, and declarations, which expression-oriented languages often treat as statements rather than expressions. Some expression-oriented languages introduce a void return type to be yielded by expressions that merely cause side-effects.
ALGOL 68 and Lisp are examples of expression-oriented languages. Pascal is not an expression-oriented language. All functional programming languages are expression-oriented.
Read more about Expression-oriented Programming Language: Criticism
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