Functional
Intermediate 3 min read
Extension Functions: Add Behaviour Without Inheritance
Extend any class — even ones you don't own
Android Academy
Android Engineer
Extension functions let you add methods to existing classes without subclassing or modifying them. They are resolved statically at compile time, so they don't actually modify the class. Common Android patterns include adding show()/hide() helpers to View, or isEmailValid() to String. Group related extensions in a dedicated file (e.g., ViewExtensions.kt) for discoverability.
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