Temidtech

// Imagine you have code like this:
class Employee {
  final double salary;
  Employee(this.salary);
}

class SoftwareEngineer extends Employee {
  final String level;
  SoftwareEngineer(final double salary, this.level) : super(salary);
}

Temidtech

fun main(args: Array<String>) {
 val location: Any = "Code must compile!"
 val safeString: String? = location as? String
 val safeFloat: Float? = location as? Float
 println(safeString)
 println(safeFloat)
 }
 
//Compiler returns this output:

Temidtech

var y = 5 
var x = y as? String 
println(x) //gives a null as a result

Temidtech

var b = 5 
var a = b as String? 
println(a) // Oh my!!! Another crash

Temidtech

var b = null
var a = b as String?
println(a)

Temidtech

var b = null
var a = b as String
println(a) // ops!!! crashes

Temidtech

// 1. Smart cast example
fun getUserName(): String? = ... 
    val username = getUserName() 
    if (username != null) { 
      println(username.length) 
    } 

// 2. Another Example
fun getName(obj: Any?){ 
	if (obj == null || obj !is String) 

Temidtech

val soloList: List<Any> = listOf("Wakanda forever!", "Kotlin is fire!",2018,29.3,12.2837827,true)
    
      for(value in soloList) {
            when (value) {
                is String -> println("String: '$value'. Capitalize :${value.capitalize()}")
                is Int -> println("Integer: '$value'")
                is Double -> println("Double: '$value'")
                is Float -> println("Float: '$value'")
                else -> println("Unknown Type")
            }

Temidtech

fun main(args:Array<String>){ 
var kingdom:String = "Wakanda" // 1
kingdom = "Zakanda" // 2
println(kingdom)
}

Temidtech

class rand { val random: Int get() = Random().nextInt() }