Template method
The strategy pattern allows replacing an entire algorithm with a complimentary one. Frequently replacing the entire algorithm is overkill: the vast majority of the algorithm remains the same in every strategy with only minor variations in specific sections.
The template method pattern is an approach that allows for some sections of an algorithm to be shared and other sections be implemented using different approaches. These farmed out sections can be implemented by any one of a family of methods. The following diagram describes the template method pattern:
The template class implements parts of the algorithm and leaves other parts ...
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