pawegio

data class Report(val uuid: String, val name: String, val date: Long)

fun loadReport(uuid: String) {
    api.getReport(uuid) { (_, name, date) ->
        reportView.text = name
        dateView.text = formatDate(date)
    }
}

pawegio

fun doSthWithReport(report: Report) = when (report) {
    is HourlyReport -> view.showHours(report.hours)
    is DailyReport -> view.showDate(report.date)
    //else -> throw IllegalArgumentException() <- NOT NEEDED!
}

pawegio

sealed class Report {
    abstract val uuid: String
    abstract val date: String
}

data class HourlyReport(
        override val uuid: String,
        override val date: String,
        val hours: Int) : Report()

pawegio

package inheritance

sealed class S // no { here

class A : S()

class B : S() {
    // ...
}

pawegio

val Context.alarmManager 
    inline get() = getSystemService(Context.ALARM_SERVICE) as AlarmManager?

pawegio

inline val Context.alarmManager 
    get() = getSystemService(Context.ALARM_SERVICE) as AlarmManager?

pawegio

typealias ItemAction = (Item, Int, Boolean) -> Unit

open class ViewHolder(view: View, val action: ItemAction? = null) : RecyclerView.ViewHolder(view) {
    // ...
}

class AViewHolder(view: View, action: ItemAction? = null) : ViewHolder(view, action) {
    // ...
}

pawegio

open class ViewHolder(view: View, val action: ((Item) -> Unit)? = null) : RecyclerView.ViewHolder(view) {
    // ...
}

class AViewHolder(view: View, action: ((Item) -> Unit)? = null) : ViewHolder(view, action) {
    // ...
}

class BViewHolder(view: View, action: ((Item) -> Unit)? = null) : ViewHolder(view, action) {
    // ...

pawegio

class ViewHolder(view: View, val action: ((Item) -> Unit)? = null) : RecyclerView.ViewHolder(view) {
    fun bind(item: Item) {
        itemView.setOnClickListener { action?.invoke(item) }
    }
}

pawegio

fun loadUser(id: Int) = async {
    val user = api.getUser(id).await() // not blocking main thread
    textView.text = "User: ${user.name}"
}