pedrolopesme

fun main(args: Array<String>){
  var myVar:String = null;
}

pedrolopesme

fun myFunction(name: String){
  // name nunca será null. Dentro do escopo desta função
  // não há a necessidade de checar se name == null
  println(name.length);
}

pedrolopesme

fun myFunction(){
  var myVar:String? = null;
}

pedrolopesme

fun myFunction(){
  var myVar:String? = null;
  // ↓ Você não pode chamar o .length diretamente
  var myVarLength:Int = myVar.length; 
}

pedrolopesme

fun myFunction(){
  var myVar:String? = null;
  var myVarLength:Int? = myVar?.length;
}

pedrolopesme

fun myFunction(){
  var myVar:String? = null;
  // Nesse caso,myVarLength será zero.
  var myVarLength:Int = myVar?.length ?: 0; 
}

pedrolopesme

fun myFunction(){
  var myVar:String? ="Hello, World!";
  if(myVar != null) {
    println(myVar.length);
  }
}

pedrolopesme

fun main(args: Array<String>) {
	val sum = { x: Int, y:Int -> x + y }	
}

pedrolopesme

fun main(args: Array<String>) {
	val sum: (Int, Int) -> Int = { x, y -> x + y }
}

pedrolopesme

fun main(args: Array<String>) {
	val sum: (Int, Int) -> Int = { x, y -> x + y }
	println(sum(2,3)) // -> Imprime 5
}