swift-collections

// Arrays
var numbers:[Int] = Array(repeating: 0, count: 10)
numbers[5] = 5
print (numbers)

var names:[String] = Array()

// Sets
var favoriteArtists: Set<String> = ["Weeknd", "Rihanna", "Seether"]
favoriteArtists.insert("Alo")
favoriteArtists.insert("Seether")
print(favoriteArtists)

// Dictionary
var places: [String:(lat: Double, lon: Double)] = ["Sofia":(42.7, 23.3), "Vienna":(48.12, 16.22), "San Francisco":(37.47, -122.25)]

print(places["Sofia"]?.lat)
places["Barcelona"] = (47.23, 2.11) // insert
places["Sofia"] = (42.65, 23.34) // modify

places.removeValue(forKey: "Sofia") // removes element
places["Barcelona"] = nil
print(places)