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12 lines
586 B
Markdown
12 lines
586 B
Markdown
## Template Method
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Template method defines the skeleton of an algorithm in an operation, deferring some
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steps to subclasses. It lets subclasses redefine certain steps of an algorithm
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without changing the algorithm's structure. The pattern has behavioral purpose and
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applies to the classes.
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### When to use
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* to implement the invariant parts of an algorithm once and leave it up to subclasses to implement the behavior that can vary
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* when common behavior among subclasses should be factored and localizedin a common class to avoid code duplication
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* to control subclasses extensions |