context-example.kt

class PrintingScope(
    val separator: String = "________________"
)

context(PrintingScope)
fun <K, V> Map<K, V>.customPrint() {
    forEach { (k, v) ->
        println("K: $k")
        println("V: $v")
        println(separator)
    }
}

// usage
val mapping = mapOf("a" to 1, "b" to 2, "c" to 3)
val scope = PrintingScope()

with(scope) {
    mapping.customPrint()
}