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Protocol Oriented
Programming in Swift
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"Crusty" is an old-school programmer
who doesn't trust IDE's, debuggers and
he doesn’t do OOP
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Classes are Awesome
● Encapsulation
● Access Control
● Abstraction
● Namespace
● Expressive Syntax
● Extensibility
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Classes are Awesome
● Encapsulation
● Access Control
● Abstraction
● Namespace
● Expressive Syntax
● Extensibility
You can do all that with structs and
enums!
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Classes are Awesome
Inheritance
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Classes are Awesome
Inheritance
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Classes are Awesome
Inheritance
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Crusty's 3 complaints about classes
1. Implicit sharing
2. Inheritance is too intrusive
3. Lost type relationships
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Implicit Sharing
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Implicit Sharing
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Implicit Sharing
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Inheritance too intrusive
● You can only have 1 super class
● Bloating your super class
● If superclass have stored properties
○ You have to accept them, which bloat it
○ You have to initialize it
○ Make sure that you understand how to interact with
your superclass
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Lost Type Relationships
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Protocol Solves the Problems