Simple Event Bus Kotlin

Bus.kt

object Bus {
  // val event = Event<Any>()
}

class Event<TYPE> {
  private val handlers = arrayListOf<((TYPE) -> Unit)>()
  operator fun plusAssign(handler: (TYPE) -> Unit) {
    handlers.add(handler)
  }

  operator fun minusAssign(handler: (TYPE) -> Unit) {
    handlers.remove(handler)
  }

  operator fun invoke(type: TYPE) = handlers.toList().forEach { it(type) }
}

Example:

Bus {
  val event = Event<Model>()
}

private val event: (Model) -> Unit = { 
  // whatever 
}

fun bind() {
  Bus.event += event
}

fun unbind() {
  Bus.event -= event
}

Bus.event(Model())