29.5. Strategy
The Strategy pattern applies when you have a general problem to be solved by two or more algorithms. The choice of solutions represents a decision the user makes. For example, a graphics program allows for saving an image in many different formats, each with unique code for writing a file. The input to each of these routines is identical.
This pattern can also solve the problem of presenting a Web application in various languages or styles. Very simple schemes can get by with an array of translated words or colors for a theme, but complex customization may require code to produce dynamic results. I encountered this situation when trying to allow for international versions of an e-commerce site.
Aside from differences in language, ...
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