2014-07-20-dictionaries.swift

var routeOneEncounterRates = ["Pidgey": 0.55, "Rattata": 0.45]
var fishingEncounterRates: [String: Double] = [:]
fishingEncounterRates = [String: Double]()
// routeOneEncounterRates = ["Pidgey": "55%"]
routeOneEncounterRates.count
routeOneEncounterRates.isEmpty
let rattataRate = routeOneEncounterRates["Rattata"]
fishingEncounterRates["Poliwag"] = 0.5
routeOneEncounterRates["Mewtwo"] = 0.0
let pokéMart = ["Poké Ball": 200, "Potion": 300]
// pokéMart["Antidote"] = 100
routeOneEncounterRates["Mewtwo"] = nil
let comparison = ["Rattata": 0.45, "Pidgey": 0.55] == ["Pidgey": 0.55, "Rattata": 0.45]