Design Patterns – part I
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  History
       Design Patterns:
         ◮ are derived from design patterns from architecture
         ◮ their name was introduced to the software engineering by
           Kent Beck and Ward Cunningham in 1987
         ◮ were made popular by Gang of Four in 1995 through book
           Design Patterns: Elements of Reusable Object-Oriented
           Software
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  Solutions of design problems
       Design Patterns:
         ◮ provide tested solutions of problems
         ◮ are not algorithms, because they solve design problems and
            not computational problems
         ◮ are abstract description of connections between classes
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  Describing Design Patterns
       Minimal description of Design Patterns:
         ◮ pattern name
         ◮ intent
         ◮ solution
         ◮ consequences
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