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In [[computer programming]], an '''aggregate pattern''' is a [[Design pattern (computer science)|design pattern]].
Members of a common [[Subclass (computer science)|subclass]] are each known to have certain [[Method (computer science)|method]]s. These methods return information about the state of that particular [[object (computer science)|object]]. It does happen that an application is concerned with an aggregation, or amalgamation, of data from several object of the same type. This leads to code being repeated around the program:
my $subtotal;
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