October 2017
Intermediate to advanced
210 pages
5h 32m
English
Content preview from Swift 4 Protocol-Oriented Programming - Third Edition
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Protocol extensions
Protocols, like other types, can be extended. Protocol extensions can be used to provide common functionality to all types that conform to a particular protocol. This gives us the ability to add functionality to any type that conforms to a protocol rather than adding the functionality to each individual type or through a global function. Protocol extensions, like regular extensions, also give us the ability to add functionality to types that we do not have the source code for.
Protocol-oriented programming and frameworks such as GameplayKit rely heavily on protocol extensions. Without protocol extensions, if we wanted to add specific functionality to a group of types that conformed to a protocol, we would have to add the ...
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