2018.10.22

 var str = "kotlin"
    var result = str.takeIf {
        it.startsWith("ko")
    }
    println("result = $result")

    result = str.takeUnless {
        it.startsWith("ko")
    }
    println("result = $result")

    repeat(5){
        println("This is the ${it+1} time, the index is $it")
    }