How to do it...

First, let's investigate arrays, which are an ordered list of elements. Enter the following into a new playground to see how we can create arrays and manipulate the elements in them:

var moviesToWatch: Array<String> = Array() 
moviesToWatch.append("The Shawshank Redemption") 
moviesToWatch.append("Ghostbusters") 
moviesToWatch.append("Terminator 2") 
print(moviesToWatch[0]) // "The Shawshank Redemption" 
print(moviesToWatch[1]) // "Ghostbusters" 
print(moviesToWatch[2]) // "Terminator 2" 
print(moviesToWatch.count) // 3 
 
moviesToWatch.insert("The Matrix", at: 2) 
print(moviesToWatch.count) // 4 
print(moviesToWatch)  
// The Shawshank Redemption 
// Ghostbusters 
// The Matrix 
// Terminator 2 
 
let firstMovieToWatch = moviesToWatch.first 
print(firstMovieToWatch as Any) // Optional("The Shawshank Redemption") 
let lastMovieToWatch = moviesToWatch.last 
print(lastMovieToWatch as Any) // Optional("Terminator 2") 
let secondMovieToWatch = moviesToWatch[1] 
print(secondMovieToWatch) // "Ghostbusters" 
 
moviesToWatch[1] = "Ghostbusters (1984)" 
print(moviesToWatch.count) // 4 
print(moviesToWatch)  
// The Shawshank Redemption 
// Ghostbusters (1984) 
// The Matrix 
// Terminator 2 
 
let spyMovieSuggestions: [String] = ["The Bourne Identity", "Casino Royale", "Mission Impossible"] 
 
moviesToWatch = moviesToWatch + spyMovieSuggestions 
print(moviesToWatch.count) // 7 
print(moviesToWatch) 
// The Shawshank Redemption 
// Ghostbusters (1984) 
// The Matrix 
// Terminator 2 
// The Bourne Identity 
// Casino Royale 
// Mission Impossible 
 
var starWarsTrilogy = Array<String>(repeating: "Star Wars: ", count: 3) 
starWarsTrilogy[0] = starWarsTrilogy[0] + "A New Hope"  
starWarsTrilogy[1] = starWarsTrilogy[1] + "Empire Strikes Back"  
starWarsTrilogy[2] = starWarsTrilogy[2] + "Return of the Jedi"  
print(starWarsTrilogy)  
// Star Wars: A New Hope 
// Star Wars: Empire Strikes Back 
// Star Wars: Return of the Jedi  
 
moviesToWatch.replaceSubrange(2...4, with: starWarsTrilogy) 
print(moviesToWatch.count) // 7 
print(moviesToWatch) 
// The Shawshank Redemption 
// Ghostbusters (1984) 
// Star Wars: A New Hope 
// Star Wars: Empire Strikes Back 
// Star Wars: Return of the Jedi 
// Casino Royale 
// Mission Impossible 
 
moviesToWatch.remove(at: 6) 
print(moviesToWatch.count) // 6 
print(moviesToWatch) 
// The Shawshank Redemption 
// Ghostbusters (1984) 
// Star Wars: A New Hope 
// Star Wars: Empire Strikes Back 
// Star Wars: Return of the Jedi 
// Casino Royale