Collections

var worldCapitals = mutableMapOf("United States" to "Washington D.C.", "Germany" to "Berlin", "Mexico" to "Mexico City", "France" to "Paris")
worldCapitals.put("Brazil", "Brasilia")
println(worldCapitals)
// Prints: {United States=Washington D.C., Germany=Berlin, Mexico=Mexico City, France=Paris, Brazil=Brasilia}
worldCapitals.remove("Germany")
println(worldCapitals)
// Prints: {United States=Washington D.C., Mexico=Mexico City, France=Paris, Brazil=Brasilia}

var oscarWinners = mutableMapOf("Parasite" to "Bong Joon-ho", "Green Book" to "Jim Burke", "The Shape Of Water" to "Guillermo del Toro")
println(oscarWinners.keys)
// Prints: [Parasite, Green Book, The Shape Of Water]
println(oscarWinners.values)
// Prints: [Bong Joon-ho, Jim Burke, Guillermo del Toro]
println(oscarWinners["Parasite"])
// Prints: Bong Joon-ho

var europeanDomains = mutableMapOf("Germany" to "de", "Slovakia" to "sk", "Hungary" to "hu", "Norway" to "no")

var averageTemp = mapOf("winter" to 35,  "spring" to 60,  "summer" to 85, "fall" to 55)

var companies = setOf("Facebook", "Apple", "Netflix", "Google")
println(companies.elementAt(3))
// Prints: Google
println(companies.elementAt(4))
// Returns and Error
println(companies.elementAtOrNull(4))
// Prints: null

var womenInTech = mutableSetOf("Ada Lovelace", "Grace Hopper", "Radia Perlman", "Sister Mary Kenneth Keller")

var primaryColors = setOf("Red", "Blue", "Yellow")

var seas = listOf("Black Sea", "Caribbean Sea", "North Sea")
println(seas. contains("North Sea")) // Prints: true
// The contains() function performs a read operation on any list and determines if the element exists
seas.add("Baltic Sea") // Error: cannot write to immutable list
// The add() function can only be called on mutable lists, so the code above throws an error

var worldContinents = listOf("Asia", "Africa", "North America", "South America", "Antarctica", "Europe", "Australia")
println(worldContinents.size) // Prints: 7

var cars = listOf("BMW", "Ferrari", "Volvo", "Tesla")
println(cars[2]) // Prints: Volvo

var fruits = mutableListOf("Orange", "Apple", "Banana", "Mango")

var programmingLanguages = listOf("C#", "Java", "Kotlin", "Ruby")