Swift Protocols Explained: Define Behavior Contracts for Any Type

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Swift protocols allow developers to define a set of required properties and methods that any conforming type must implement, without specifying how those requirements are fulfilled. Acting as a contract, a protocol ensures that diverse types — such as different struct-based characters in a game — can be treated uniformly by shared functions. This eliminates the need to write duplicate functions for every new type, since a single function accepting a protocol type works for all conforming types. For example, a Fighter protocol requiring name, speed, and travel methods lets Ninja, Samurai, and any future type be passed to the same sendToMission function. Conforming types are free to add their own extra methods beyond the protocol's minimum requirements, keeping code flexible and scalable.

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AI Agents vs Chatbots: Key Differences Explained for the AI Era

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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ProgrammingDEV Community ·

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