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

import Cocoa

var str = "Hello, playground"

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 using the insert(_:) method.

Listing 11.2 Adding to a set

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

You may notice that the results sidebar shows something like (.0 true, .1 "Apples") ...