Try It Yourself - SyntaxStudy Editor

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fun divide(a: Int, b: Int): Int? {
    return if (b == 0) null else a / b
}

// Type hierarchy demonstration
fun printType(value: Any?) {
    when (value) {
        null        -> println("null")
        is Int      -> println("Int: $value")
        is String   -> println("String: $value")
        is Boolean  -> println("Boolean: $value")
        else        -> println("Other: $value")
    }
}

// Function that never returns (return type = Nothing)
fun fail(message: String): Nothing {
    throw IllegalStateException(message)
}

fun main() {
    val result1 = divide(10, 2)
    val result2 = divide(10, 0)

println(result1)   // 5
    println(result2)   // null

// Compiler enforces null checks
    val r = result1 ?: fail("Division failed")
    println("Result: $r")   // 5

printType(42)
    printType("hello")
    printType(null)
    printType(3.14)

// Nullable collections vs collection of nullable
    val list1: List<Int?>  = listOf(1, null, 3)   // list of nullable Int
    val list2: List<Int>?  = null                  // nullable list

val nonNull = list1.filterNotNull()
    println(nonNull)   // [1, 3]
}