Searching for: Class Variables in Swift
Properties are variables declared within classes or structures. There are three types: instance properties, static properties. There are also lazy properties, which are either instance or static properties, and are only initialized when used. Equivalent to fields in other languages.
Structures are classes which are value-typed, similar to previous variables and lets. Structures, like classes, contain methods and properties.
Instantiation is used to create an object instance from a class (also known as initialization).
Inheritance is used to inherit another class' members, including fields and methods. A subclass extends a base class' members.
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