Kotlin的流程控制

fun cas(obj: Any) {
    when (obj) {
        1 -> println("One")
        "Hello" -> println("Greeting")
        is Long -> println("Long")
        !is String -> println("not a string")
        else -> println("Unknown")
    }
}

fun whenExpression(obj: Any) {
    var result = when (obj) {
        is String -> obj.toString()
        else -> "Hello"
    }
}

val cakes = listOf<String>("A", "B", "C")
    for (cake in cakes) {
        println("Yum, it is nice $cake cake!")
    }

var index = 5
    while (index < 10) {
        index++
    }
    do {
        println(index--)
    } while (index > 0)

for(i in 0..3) {             // 1
    print(i)
}
print(" ")

for(i in 2..8 step 2) {      // 2
    print(i)
}
print(" ")

for (i in 3 downTo 0) {      // 3
    print(i)
}
print(" ")

if (x !in 1..4) {            // 2
    print(x)
}

val authors = setOf("Shakespeare", "Hemingway", "Twain")
val writers = setOf("Twain", "Shakespeare", "Hemingway")

println(authors == writers)   // 1
println(authors === writers)  // 2

val authors = setOf("Shakespeare", "Hemingway", "Twain")
val writers = authors

println(authors == writers)   // 1
println(authors === writers)  // 2

fun max(a: Int, b: Int) = if (a > b) a else b         // 1

println(max(99, -42))