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In computer science, a Boolean expression is an expression used in programming languages that produces a Boolean value when evaluated. A Boolean value is either true or false.A Boolean expression may be composed of a combination of the Boolean constants True/False or Yes/No, Boolean-typed variables, Boolean-valued operators, and Boolean-valued functions.
/expression/. test (string); // returns Boolean "string". search ... Spread syntax provides another way to destructure arrays and objects. For arrays, it indicates ...
The search engine supports limited boolean logic in searches ... or a search term outside of the insource component of the search string. (For example, ...
The (standard) Boolean model of information retrieval (BIR) [1] is a classical information retrieval (IR) model and, at the same time, the first and most-adopted one. [2] The BIR is based on Boolean logic and classical set theory in that both the documents to be searched and the user's query are conceived as sets of terms (a bag-of-words model ).
contains(string,substring) returns boolean Description Returns whether string contains substring as a substring. This is equivalent to using Find and then detecting that it does not result in the failure condition listed in the third column of the Find section. However, some languages have a simpler way of expressing this test. Related
[1] [2] Indeed, a Boolean variable may be regarded (and implemented) as a numerical variable with one binary digit , or as a bit string of length one, which can store only two values. The implementation of Booleans in computers are most likely represented as a full word , rather than a bit; this is usually due to the ways computers transfer ...
Web search queries are distinctive in that they are often plain text and boolean search directives are rarely used. They vary greatly from standard query languages , which are governed by strict syntax rules as command languages with keyword or positional parameters .
For example, a search for red apple may return records that contain the word "apple," ones that contain "red," and ones that contain both words no matter where in the record they appear (that is, assuming the search engine applies Boolean OR logic to its keyword search function), whereas a search for "red apple" will only return records that ...