Swift Interview Questions and Answers

Swift has five access levels: open access, public access, internal access, file-private access, and private access. Open access is the highest access level and private access is the lowest access level. Almost all entities, except a few, have default internal access levels.

Adapter pattern allows the classes with incompatible interfaces to work together. An adapter pattern wraps itself around the object to show a standard interface for interacting with that object.
Memento pattern is used in iOS as a part of state restoration. These patterns are especially used for archiving in Apple.

It is a group of values represented as one value, which can be used to return multiple values from a single function call.

Tuple are of two types - Named and Unnamed.

Encodable protocols take instances of our objects and turn them into data. That data can be stored it to the files or sent to the server.
Decodable protocols allow us to take data and create instances of our objects and pass down from the server.

3 reasons inheritance is not good:

• You cannot use superclasses or inheritance with Swift value types.
• Upfront modeling
• Customization is vague.