John Vlissides - Author - Software-Pattern.org

John Matthew Vlissides (August 2, 1961 - November 24, 2005) was a software scientist known mainly as one of the four authors (referred to as the Gang of Four) of the book Design Patterns: Elements of Reusable Object-Oriented Software. Vlissides referred to himself as "#4 of the Gang of Four and wouldn't have it any other way".

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Strategy

Behavioral Pattern

The strategy pattern is used to create an interchangeable family of algorithms from which the required process is chosen at run-time.

Template Method

Behavioral Pattern

The template method pattern is used to define the basic steps of an algorithm and allow the implementation of the individual steps to be changed.

Visitor

Behavioral Pattern

The visitor pattern is used to separate a relatively complex set of structured data classes from the functionality that may be performed upon the data that they hold.