package examples.showcase

import fmt
import strings

interface Greeter {
    fun greet(name: String): String
}

class PrefixGreeter(val prefix: String): Greeter {
    fun greet(name: String): String {
        return prefix + " " + name
    }
}

fun main() {
    val greeter: Greeter = PrefixGreeter("hello")
    println(greeter.greet("gotlin"))

    val names = listOf<String>("ada", "linus")
    val scores = mapOf<String, Int>("ada", 10, "linus", 8)
    println(names)
    println(scores)

    val upper = strings.ToUpper("gotlin")
    fmt.Println("interop:", upper)

    val maybe: String? = null
    if (maybe == null) {
        println("null check works")
    }

    runBlocking {
        val ready = Channel<String>()
        launch {
            delay(120)
            ready.send("timer fired")
        }
        select {
            ready -> println("channel says: " + it)
        }

        val answer = async<Int> {
            delay(50)
            return 42
        }
        fmt.Println("async value:", answer.await())
    }
}