Files and Text Streams

Resource Cleanup

Model opening, using, and closing a resource with explicit state.

Resource Cleanup

ResourceCleanup.kt 
fun main() {
    val chunk = 
    var state = "open"
    val opened = state == "open"
    val readText = "read:$chunk"
    state = "closed"
    val ready = state == "closed"

    println("opened=$opened")
    println("read=$readText")
    println("state=$state")
    println("ready=$ready")
}

fun main() {
    val chunk = 
    var state = "open"
    val opened = state == "open"
    val readText = "read:$chunk"
    state = "closed"
    val ready = state == "closed"

    println("opened=$opened")
    println("read=$readText")
    println("state=$state")
    println("ready=$ready")
}

fun main() {
    val chunk = 
    var state = "open"
    val opened = state == "open"
    val readText = "read:$chunk"
    state = "closed"
    val ready = state == "closed"

    println("opened=$opened")
    println("read=$readText")
    println("state=$state")
    println("ready=$ready")
}
resource-cleanup Cleanup code should leave a resource in a known final state.