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- Guard_(computer_science) abstract "In computer programming, a guard is a boolean expression that must evaluate to true if the program execution is to continue in the branch in question.Regardless of which programming language is used, guard code is a check of integrity preconditions used to avoid errors during execution. A typical example is checking that a reference about to be processed be not null, which avoids null-pointer failures.The term is used with specific meaning a.o. in Haskell, Clean, Erlang, occam, Promela, OCaml and Scala programming languages.[citation needed] In Mathematica, guards are called constraints. Guards are the fundamental concept in Guarded Command Language, a language in formal methods. Guards can be used to augment pattern matching with the possibility to skip a pattern even if the structure matches. Boolean expressions in conditional statements usually also fit this definition of a guard although they are called conditions.In the following Haskell example, the guards occur between each pair of "|" and "=":This is similar to the respective mathematical notation:In this case the guards are in the "if" and "otherwise" clauses.If there are several parallel guards, such as in the example above, they are normally tried in a top to bottom order and the branch of the first to pass is chosen. Guards in a list of cases are typically parallel.However, in Haskell list comprehensions the guards are in series, and if any of them fails, the list element is not produced. This would be the same as combining the separate guards with logical AND, except that there can be other list comprehension clauses among the guards.".
- Guard_(computer_science) wikiPageExternalLink section-2.3.5.
- Guard_(computer_science) wikiPageExternalLink guard.
- Guard_(computer_science) wikiPageExternalLink exps.html.
- Guard_(computer_science) wikiPageExternalLink guards.html.
- Guard_(computer_science) wikiPageExternalLink pattern-guards.
- Guard_(computer_science) wikiPageID "1186249".
- Guard_(computer_science) wikiPageRevisionID "599646595".
- Guard_(computer_science) hasPhotoCollection Guard_(computer_science).
- Guard_(computer_science) subject Category:Articles_with_example_Haskell_code.
- Guard_(computer_science) subject Category:Conditional_constructs.
- Guard_(computer_science) subject Category:Formal_methods_terminology.
- Guard_(computer_science) type Abstraction100002137.
- Guard_(computer_science) type Cognition100023271.
- Guard_(computer_science) type Concept105835747.
- Guard_(computer_science) type ConditionalConstructs.
- Guard_(computer_science) type Content105809192.
- Guard_(computer_science) type Idea105833840.
- Guard_(computer_science) type PsychologicalFeature100023100.
- Guard_(computer_science) comment "In computer programming, a guard is a boolean expression that must evaluate to true if the program execution is to continue in the branch in question.Regardless of which programming language is used, guard code is a check of integrity preconditions used to avoid errors during execution. A typical example is checking that a reference about to be processed be not null, which avoids null-pointer failures.The term is used with specific meaning a.o.".
- Guard_(computer_science) label "Garde (informatique)".
- Guard_(computer_science) label "Guard (computer science)".
- Guard_(computer_science) label "Охрана (программирование)".
- Guard_(computer_science) label "ガード (プログラミング)".
- Guard_(computer_science) sameAs Garde_(informatique).
- Guard_(computer_science) sameAs ガード_(プログラミング).
- Guard_(computer_science) sameAs m.04fhvk.
- Guard_(computer_science) sameAs Q2379942.
- Guard_(computer_science) sameAs Q2379942.
- Guard_(computer_science) sameAs Guard_(computer_science).
- Guard_(computer_science) wasDerivedFrom Guard_(computer_science)?oldid=599646595.
- Guard_(computer_science) isPrimaryTopicOf Guard_(computer_science).