ReneeVandervelde

class UserInfoFormatter(
    private val resources: Resources
) {
    fun getDisplayName(user: User) {
        if (user.name.isNullOrEmpty()) {
            return resources.getString(R.string.name_unknown)
        } else {
            return user.name
        }
    }

ReneeVandervelde

@Deprecated(
  message = “Tell me what Foo is!”,
  replaceWith = ReplaceWith(“newHotness(foo, bar)”)
)
fun oldAndBusted(bar: String) {}

ReneeVandervelde

@Deprecated(
  message = “I forgot about Foo!”,
  replaceWith = ReplaceWith(“newHotness(DEFAULT, bar)”, “acme.sandbox.foo.DEFAULT”)
)
fun oldAndBusted(bar: String) {}

ReneeVandervelde

@Deprecated(
  message = “I wrote this backwards”,
  replaceWith = ReplaceWith(“newHotness(foo, bar)”)
)
fun oldAndBusted(bar: String, foo: String) {}

ReneeVandervelde

@Deprecated(
  message = “Use something different”, 
  replaceWith = ReplaceWith(“newHotness()”)
)
fun oldAndBusted() {}

ReneeVandervelde

import io.reactivex.Observable
import io.reactivex.functions.Consumer

class Foo {
    fun main() {
        Observable.just("foo").subscribe(this::stringConsumer, this::errorConsumer)
    }

    fun stringConsumer(value: String) { TODO() }
    fun errorConsumer(error: Throwable) { TODO() }

ReneeVandervelde

import io.reactivex.Observable
import io.reactivex.functions.Consumer

class MyErrorHandler : Consumer<Throwable> {
    override fun accept(t: Throwable?) { TODO() }
}

class Foo {
    fun main() {
        val errorHandler = MyErrorHandler()

ReneeVandervelde

interface KotlinConsumer<T> {
    fun accept(value: T)
}
class KotlinObservable<T> {
    fun subscribe(onNext: KotlinConsumer<T>) {}
}

class Test {
    fun main() {
        // FAILS: Type Mismatch: inferred type is KFunction1<@ParameterName String, Unit> but KotlinConsumer<String> was expected

ReneeVandervelde

import io.reactivex.Observable
import io.reactivex.functions.Consumer

class Foo {
    fun main() {
        Observable.just("foo", "bar").subscribe(this::stringConsumer)
    }

    fun stringConsumer(value: String) {
      println(value)

ReneeVandervelde

fun setOnClickListener(listener: (view: View) -> Unit) {
   // ...
}

fun main() {
  setOnClickListener { it.bringToFront() }
  setOnClickListener(this::test)
}

fun test(view: View) {