Grokking Design Patterns for Engineers and Managers
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Bridge Pattern

The Bridge Pattern splits one class into two hierarchies that can vary independently, before they multiply into a class explosion.

Two things vary at once. You have three kinds of notification, an alert, a reminder and a digest, and three ways to deliver one, email, SMS and push. If both live in the same hierarchy, you need nine classes. Add a fourth channel and you need twelve. Add a fourth type as well and you need sixteen.

The giveaway is a class name with two nouns in it: EmailAlert, SmsDigest, PushReminder

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