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- Metasyntactic_variable abstract "A metasyntactic variable is a placeholder name used in computer science, a word without meaning intended to be substituted by some objects pertaining to the context where it is used. The word foo as used in IETF Requests for Comments is a good example.By mathematical analogy, a metasyntactic variable is a word that is a variable for other words, just as in algebra letters are used as variables for numbers. Any symbol or word which does not violate the syntactic rules of the language can be used as a metasyntactic variable. For specifications written in natural language, nonsense words are commonly used as metasyntactic variables.Metasyntactic variables have a secondary, implied meaning to the reader (often students), which makes them different from normal metavariables. It is understood by those who have studied computer science that certain words are placeholders or examples only and should or must be replaced in a production-level computer program.In hacker culture, "metasyntactic variable" has come to denote some typical (otherwise meaningless) words used as metavariables in computing; see reification. For example, The Hacker's Dictionary (1st ed.) defined FOO as "the first metasyntactic variable" and BAR as "the second metasyntactic variable", explaining that "When you have to invent an arbitrary temporary name for something for the sake of exposition, FOO is usually used. If you need a second one, BAR or BAZ is usually used; there is a slight preference at MIT for bar and at Stanford for baz. Clearly, bar was the original, for the concatenation FOOBAR is widely used also, and this in turn can be traced to the obscene acronym 'FUBAR' that arose in the armed forces during World War II. [...] A hacker avoids using 'foo' as the real name of anything. Indeed, a standard convention is that any file with 'foo' in its name is temporary and can be deleted on sight." The names of these consecrated "metasyntactic variables" are also commonly used as actual identifiers (for variables, functions, etc.) in tutorial programming examples when their purpose is to emphasize syntax; in this usage, "metasyntactic variable" is synonymous with "meaningless word".".
- Metasyntactic_variable wikiPageExternalLink Commonwealth-Hackish.html.
- Metasyntactic_variable wikiPageExternalLink metasyntactic-variable.html.
- Metasyntactic_variable wikiPageExternalLink 000375.html.
- Metasyntactic_variable wikiPageID "20036".
- Metasyntactic_variable wikiPageRevisionID "603367174".
- Metasyntactic_variable hasPhotoCollection Metasyntactic_variable.
- Metasyntactic_variable subject Category:Metalogic.
- Metasyntactic_variable subject Category:Placeholder_names.
- Metasyntactic_variable subject Category:Syntax_(logic).
- Metasyntactic_variable subject Category:Variable_(computer_programming).
- Metasyntactic_variable comment "A metasyntactic variable is a placeholder name used in computer science, a word without meaning intended to be substituted by some objects pertaining to the context where it is used. The word foo as used in IETF Requests for Comments is a good example.By mathematical analogy, a metasyntactic variable is a word that is a variable for other words, just as in algebra letters are used as variables for numbers.".
- Metasyntactic_variable label "Metasyntactic variable".
- Metasyntactic_variable label "Metasyntactische variabele".
- Metasyntactic_variable label "Metasyntaktische Variable".
- Metasyntactic_variable label "Variabile metasintattica".
- Metasyntactic_variable label "Variable métasyntaxique".
- Metasyntactic_variable label "Zmienna metasyntaktyczna".
- Metasyntactic_variable label "Метапеременная".
- Metasyntactic_variable label "メタ構文変数".
- Metasyntactic_variable sameAs Metasyntaktische_Variable.
- Metasyntactic_variable sameAs Variable_métasyntaxique.
- Metasyntactic_variable sameAs Variabile_metasintattica.
- Metasyntactic_variable sameAs メタ構文変数.
- Metasyntactic_variable sameAs Metasyntactische_variabele.
- Metasyntactic_variable sameAs Zmienna_metasyntaktyczna.
- Metasyntactic_variable sameAs m.050zy.
- Metasyntactic_variable sameAs Q100023.
- Metasyntactic_variable sameAs Q100023.
- Metasyntactic_variable wasDerivedFrom Metasyntactic_variable?oldid=603367174.
- Metasyntactic_variable isPrimaryTopicOf Metasyntactic_variable.