Kotlin Cities.txt

fun main() 
{
    var cityLocations = listCities()
    
    println("***********STEP TWO***********")
    for(i in cityLocations)
    {
    	println(i)
    }
   	println()
    
    println("***********STEP THREE***********")
    println("The distance between Seattle and Tacoma is " + distanceFromSeattle(cityLocations[4]))
    println()
    
    println("***********STEP FOUR***********")
    var allDist = cityLocations.map{distanceFromSeattle(it)}
    println(allDist)
    println()
    
    println("***********STEP FIVE***********")
    println("List of cities over 1000Km from Seattle - ")
    
    var filtr = cityLocations.filter{filterList(it)}
    for ( i in filtr){println(i.name)}
    println()
    
    println("***********STEP SIX***********")
    var west = (cityLocations.filter{it.longitude < -89.97803}).map{it.name}
    println(west)
    println()
    
    println("***********STEP SEVEN***********")
    var furthest = cityLocations.maxBy{distanceFromSeattle(it)}
    println("Max Distance: $furthest")
    println()
    
    
    println("***********STEP EIGHT***********")
    
    var map = mapOf(cityLocations.map{it.name} to cityLocations)
    
    var mappedCities = mutableMapOf<String, City>()
    
    for (i in cityLocations)
    {
        mappedCities[i.name] = i
    }
   	
    
    for ((k,v) in mappedCities)
    {
        println("Name $k: City $v")
    }
    
    if(mappedCities.containsKey("Bozeman"))
    {
     println("The latitude of Bozeman is " + mappedCities.getValue("Bozeman").latitude)
    }
    
    
}
data class City(val name: String, val latitude: Double, val longitude: Double)
{   
}

fun listCities(): List<City>
{
    val city1 = City("Atlanta",33.7490,-84.3380)
    val city2 = City("Bozeman",45.677,-111.0129)
    val city3 = City("New York",40.7128,-74.0060)
    val city4 = City("San Francisco",37.7749,-122.4194)
    val city5 = City("Tacoma",47.2529,-122.4443)
   	val cities = listOf(city1,city2,city3,city4,city5)
   
 	return cities
}

fun distanceFromSeattle(citi: City) : Double
{
    val distance = haversine(citi.latitude, citi.longitude, 47.6062, -122.3321)
    return distance
}

fun filterList(citi : City): Boolean
{
    val dist = distanceFromSeattle(citi)
    
    if( dist > 1000)
    {
        return true
    }
    else
    {
        return false
    }
}

fun haversine(lat1: Double, lon1: Double, lat2: Double, lon2: Double) : Double
{
    val R = 6372.8
    val l1 = Math.toRadians(lat1)
    val l2 = Math.toRadians(lat2)
    val dl = Math.toRadians(lat2 - lat1)
    val dr = Math.toRadians(lon2 - lon1)
    return 2*R * Math.asin(Math.sqrt(Math.pow(Math.sin(dl/2),2.0) + Math.pow(Math.sin(dr/2),2.0)* Math.cos(l1)*Math.cos(l2)))
}