This is similar to the previous one, but it checks directly for the type:

if (nullableCupcake is Cupcake) {
  nullableCupcake.eat()
}

It also works with when:

when (nullableCupcake) {
  is Cupcake -> nullableCupcake.eat()
}

Both options, checking for null and non-null types, are a little bit verbose. Let's check other options.