Snippets: Introduction to Kotlin

Kotlin.kt

open class Person(var name:String, var age:Int){
    open fun appelation():String{
        return "Yo!"
    }
    
    override fun toString():String{
        return "${this.appelation()} $name"
    }
    
    
    fun forceChoke(){
        println("You have attempted for the last time Com. ${this.name}")
    }
}

class Male(name:String, age:Int, var trouserLength:Int):Person(name,age){
    override fun appelation():String{
        return "Mr."
    }
}


fun main() {
    var name : String? = null;
    val nameLength = name?.length ?: -1;
    var male = Male("Adebayo Sanni",23,32)
    println("$male")
    println("Hello ${male.appelation()} ${male.name}, ${male.age}yo isn't too old! $nameLength")
    
    val sumA: (Int,Int)->Int = {x,y->x+y}
    println(sumA(3,2))
    
    val sumB = {x: Int, y:Int->x+y}
    println(sumB(3,3))
    
    male.forceChoke()
    
    fun downloadData(uri:String,completion:((progress:Double)->Unit)){
        //make download request
        //get data
        //call completion with percentage donw
        //
        for(i in 1..100){
        	completion(i.toDouble())       
        }
        
        println("Download is complete")
    }
    
    downloadData("https://google.com/myhiddenfile.csv",{perc:Double->println("Current download progress is $perc%")})
}