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Programming Patterns

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Suppose an output component keeps gaining conditionals for ~~different~~ ~~formats~~. ~~Moving~~ ~~each~~ conversion into a ~~function~~ or ~~object~~ ~~lets~~ ~~the~~ ~~format~~ change while the output code stays ~~the~~ ~~same.~~ ~~This~~ ~~solution~~ ~~structure~~ is ~~called~~ the Strategy pattern.

Suppose an output component keeps gaining conditionals, one for each new format. If you split the conversion rules into separate functions or objects and pass them in, you can change the format while the output code stays as it is; that arrangement is what we call the Strategy pattern.

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Java and C# ~~can~~ ~~receive~~ an object ~~implementing~~ an interface; Python ~~can~~ ~~receive~~ a function or an object that provides the required behavior. Keep the contract the component ~~needs~~, ~~while~~ ~~expressing~~ it ~~through~~ the language's idioms.

Java and C# let you pass an object that implements an interface, while Python lets you pass a function or an object that provides the required behavior. Keep the contract the component uses, but express it the way the language's idioms favor.