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Lesson 15 - Enums and custom errors in Swift

In the previous lesson, Handling errors in Swift, we learned how to use methods which can raise an Error. There are several variants of try-catch blocks to do this. In today's Swift tutorial, we're going to explain enumerated types, enums, and how to define our own error states - own Errors.

Enums

It's nothing complicated. Enums represent a list of possible values of a variable. It's useful, especially when storing an object's state which can be one of only a few values. If we stored the individual values as Strings, nobody could guarantee they only contain the defined values and we could make a mistake. We can only store one of the predefined values to an enum type variable.

Days of the week are a typical example of enum usage, just as well as e.g.


 

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In this Swift tutorial, we'll learn to use enums, the enumerated types. It'll be followed by creating and handling custom Errors.

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