NSPredicate is a Foundation class that specifies how data should be fetched or filtered. Its query language, which is like a cross between a SQL WHERE clause and a regular expressions, provides an expressive, natural language interface to define logical conditions on which a collection is searched.
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Scooped by
Vincent Demay
onto iPhone and iPad development July 18, 2013 1:47 PM
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Yet another great article from NSHipster