ScopingFunctions.kt

fun using_with() {
    val stringBuilder = StringBuilder()
    stringBuilder.append("Hello")
    stringBuilder.append(", Kotlin!")
    print(stringBuilder.toString())
}

fun using_also(a: Int): Int {
    val b = a * 10
    if (b > 100) print(">100")
    return b
}

fun using_apply(): java.util.Properties {
    val properties = java.util.Properties()
    properties.setProperty("key", "value")
    return properties
}

fun using_let(p: java.util.Properties?, key: String) {
    if (p != null) print(p.getProperty(key))
}