Putting protocols and generics to use
One cool part of Swift is generators and sequences. They provide an easy way to iterate over a list of values. Ultimately, they boil down to two different protocols: GeneratorType
and SequenceType
. If you implement the SequenceType
protocol in your custom types, it allows you to use the for-in loop over an instance of your type. In this section, we will look at how we can do that.
Generators
The most critical part of this is the GeneratorType
protocol. Essentially, a generator is an object that you can repeatedly ask for the next object in a series until there are no objects left. Most of the time you can simply use an array for this, but it is not always the best solution. For example, you can even make a generator ...
Get Swift: Developing iOS Applications now with the O’Reilly learning platform.
O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.