Expression-oriented programming language GudangMovies21 Rebahinxxi LK21

      An expression-oriented programming language is a programming language in which 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.
      Lisp and ALGOL 68 are expression-oriented languages. Pascal is not an expression-oriented language.
      All functional programming languages are expression-oriented.


      Criticism and prevention



      Critics, including language designers, blame expression-orientation for an entire class of programming mistakes wherein a programmer accidentally codes an assignment expression, which replaces a variable with an expression rather than testing it for equality with that expression.
      The designers of Ada and Java prevent this type of mistake by restricting control expressions to those that evaluate strictly to the boolean data type.
      The designers of Python implemented assignment as a statement rather than an expression, thus prohibiting assignment from nesting inside any other statement or expression. (Until version 3.8 added 'assignment expressions', with a different syntax.)
      In some expression-oriented languages, expressions that merely cause side effects return void types.


      Examples



      ALGOL 68
      BLISS
      Icon
      Lisp
      ML
      Perl
      Rebol
      Ruby
      Elixir
      Erlang
      Haskell
      Rust
      Scala
      Smalltalk
      Kotlin
      OCaml


      See also


      Command–query separation
      Functional programming


      References

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