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Avoiding Temporal Coupling in Code

Yamini Bansal explains a common error in class and method design:

Temporal means time based. So, consider if the time(instant/order) at which one member of a class is called, affects the calling of another member. Or, if sequence of calling members of a class is something that should be kept in mind before using that class’s member then it means they are coupled.

Click through for an example. The basic concept is, I shouldn’t need to know that I must call setup method X() before I can take advantage of some useful method Y(). This is because a new person coming in might not realize that X() exists, will try to call Y(), and something breaks. Calling a method with a valid set of input parameters and having it immediately break is a sign of a dodgy API.

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