dictInit.swift

// 1. empty dictionary initialization
var numbers = Dictionary<String, Int>()
var newNumbers: Dictionary<String, Int> = Dictionary()

// 2. empty dictionary initialization using dictionary literals
var nums = [String: Int]()
var newNums: [String: Int] = [:]

// 3. predefininig elements with dictionary literals
var romanNumerals = ["I": 1, "V": 5, "X": 10, "L": 50]  // using type inference
var romanNums: [String: Int] = ["I": 1, "V": 5, "X": 10, "L": 50]   // explicit type declaration