Swift in Depth by Tjeerd in 't Veen

Author:Tjeerd in 't Veen [Tjeerd in 't Veen]
Language: eng
Format: epub
Publisher: Manning Publications
Published: 2018-12-27T16:00:00+00:00

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Join me!

It’s more educational and fun if you can check out the code and follow along with the chapter. You can download the source code at http://mng.bz/7JPy.

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9.1.1. IteratorProtocol

Every time you use a for in loop, you’re using an iterator. For example, you can loop over an array regularly via for in.

Listing 9.1. Using for in

let cheeses = ["Gouda", "Camembert", "Brie"] for cheese in cheeses { print(cheese) } // Output: "Gouda" "Camembert" "Brie"

But for in is syntactic sugar. Actually, what’s happening under the hood is that an iterator is created via the makeIterator() method. Swift walks through the elements via a while loop, shown here.

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