# [Empty, Never & Throw](http://reactivex.io/documentation/operators/empty-never-throw.html)

.swift

let next = { print($0) }
let error = { print($0) }
let completed = { print("Completed") }
let disposed = { print("Disposed") }


// Empty
let emptyObservable = Observable<Int>.empty()
emptyObservable.subscribe(onNext: next, onError: error, onCompleted: completed, onDisposed: disposed)

// Never
let neverObservable = Observable<Int>.never()
neverObservable.subscribe(onNext: next, onError: error, onCompleted: completed, onDisposed: disposed)

// Throw
struct RuntimeError: Error {
    let message: String
    
    init(_ message: String) {
        self.message = message
    }
    
    public var localizedDescription: String {
        return message
    }
}

let throwObservable = Observable<Int>.error(RuntimeError("Something dun Broke!"))
throwObservable.subscribe(onNext: next, onError: error, onCompleted: completed, onDisposed: disposed)