Kodebits Day 61: Object Expression

What is the output?

interface Greeter {
  fun greet(): String
}
fun main() {
  val g = object : Greeter {
    override fun greet() = "Hi"
  }
  println(g.greet())
}

Try it in the online Kotlin Playground →

[spoiler title="Solution"]

Answer:

Hi

Explanation:

Object expressions create anonymous instances that implement interfaces or extend classes.

[/spoiler]

Further Reading

• Leverage Kotlin Functions & Lambdas
• Learn the Basics of the Kotlin Language