Swift Programming: The Big Nerd Ranch Guide

Getting a Set

It is time to make an instance of Set. Create a new playground called Groceries.

Type in the following to get an instance of Set.

Listing 11.1  Creating a set

var groceryBag = Set<String>()

You made an instance of Set and declared that it will hold instances of the String type. It is a mutable Set called groceryBag and is currently empty. Let’s fix that.

You can add groceries to your groceryBag by using the insert(_:) method.

Listing 11.2  Adding to a set

var groceryBag = Set<String>()
groceryBag.insert("Apples")
groceryBag.insert("Oranges")
groceryBag.insert("Pineapple")

Now groceryBag has a few items inside of it. As with arrays and dictionaries, you can loop through a set to see its contents. ...