[String:Character]()
lessons.append(“Collections”)
Set, Array, Dictionary
import UIKit
import Foundation
var numbers = Array<Double>()
var moreNumbers = [Double]()
moreNumbers = [85.0, 90.0, 95.0]
let differentNumbers = [97.5, 98.5, 99.0]
differentNumbers = moreNumbers + differentNumbers
var circuit = [livingRoomsSwitch, kitchenSwitch, bathroomSwitch]
var roadTripMusic = ["Neil Young", "Kendrick Lamar", "Flo Rida", "Nirvana"]
roadTripMusic.append("Rae Sremmurd")
roadTripMusic.insert("Dej Loaf", atIndex: 2)
roadTripMusic.removeIndex(3)
roadTripMusic.insert("Keith Urban", atIndex: 3)
roadTripMusic.count
let musician = roadTripMusic[2]
