Iterator<T>.toObservable

Thanks to the extension functions of Kotlin, you can turn any Iterable instance, such as list, to Observable without much effort. We have already used this method in Chapter 1, Kotlin – Data Types, Objects, and Classes, but again take a look at this:

fun main(args: Array<String>) { 
    val observer: Observer<String> = object : Observer<String> { 
        override fun onComplete() { 
            println("Completed") 
        } 
 
        override fun onNext(item: String) { 
            println("Received-> $item") 
        } 
 
        override fun onError(e: Throwable) { 
            println("Error Occured => ${e.message}") 
        } 
 
        override fun onSubscribe(d: Disposable) { 
            println("Subscription") 
        } 
    }//Create Observer 
    val list:List<String> = listOf("Str 1","Str 2","Str 3","Str 4") 
 
    val observable: Observable<String> = list.toObservable() 
 
    observable.subscribe(observer...