Reaktivní programování

Přednáška o reaktivním programování a RX pro DevFest Pardubice

Promises
http://blog.jcoglan.com/2013/03/30/callbacks-are-imperative-promises-are-functional-nodes-biggest-missed-opportunity/
http://www.kendoui.com/blogs/teamblog/posts/13-03-28/what-is-the-point-of-promises.aspx
http://sealedabstract.com/code/broken-promises/
http://brianmckenna.org/blog/category_theory_promisesaplus
http://martinfowler.com/bliki/JavascriptPromise.html
http://domenic.me/2012/10/14/youre-missing-the-point-of-promises/

Záznam - https://www.youtube.com/watch?v=CzmWzG_QsUE

Transcript

1. Reaktivní programování #devfest #frp @alesroubicek http://rarous.net/weblog/
3. Events var els = document.getElementsByTagName('*'); // Case 1 for (var i = 0; i < els.length; i++){ els[i].addEventListener("click", e => { /* do something */ }, false); } // Case 2 function processEvent(e){ /*do something*/ } for (var i = 0; i < els.length; i++){ els[i].addEventListener("click", processEvent, false); }
4. Events var els = document.getElementsByTagName('*'); // Case 1 for (var i = 0; i < els.length; i++){ els[i].addEventListener("click", e => { /* do something */ }, false); } // Case 2 function processEvent(e){ /*do something*/ } for (var i = 0; i < els.length; i++){ els[i].addEventListener("click", processEvent, false); }
5. Callback hell step1(value1 => { step2(value1, value2 => { step3(value2, value3 => { step4(value3, value4 => { // Do something with value4 }); }); }); });
6. Promises
7. Promises Q.fcall(step1). then(step2). then(step3). then(step4). then(value4 => { // Do something with value4 }, error => { // Handle any error from step1 through step4 }). done();
8. Promises
9. Promises http://blog.jcoglan.com/2013/03/30/callbacks-are-imperative-promises-are-functional-nodes- biggest-missed-opportunity/ http://www.kendoui.com/blogs/teamblog/posts/13-03-28/what-is-the-point-of-promises.aspx http://sealedabstract.com/code/broken-promises/ http://brianmckenna.org/blog/category_theory_promisesaplus http://martinfowler.com/bliki/JavascriptPromise.html http://domenic.me/2012/10/14/youre-missing-the-point-of-promises/
10. Observable sequences interface IObservable<T> { IDisposable Subscribe(IObserver<T> observer); } interface IObserver<T> { void OnNext(T value); void OnError(Exception ex); void OnComplete(); }
11. Observable sequences interface IObservable<T> { IDisposable Subscribe(IObserver<T> observer); } interface IObserver<T> { void OnNext(T value); void OnError(Exception ex); void OnComplete(); }
12. Observable sequences interface IObservable<T> { IDisposable Subscribe(IObserver<T> observer); } interface IObserver<T> { void OnNext(T value); void OnError(Exception ex); void OnComplete(); } var subscription = xs.Subscribe(x => { // process value }, ex => { // handle error }); subscription.Dispose();
13. Rx .net JVM Objective-C JavaScript Ruby Haskell C++
14. Rx
15. Rx
16. Rx
17. Rx
18. Tvorba Observable.Create Observable.Empty Observable.Never Observable.Throw Observable.Return Observable.Start
19. Tvroba sekvencí Observable.Range Observable.Repeat Observable.Interval Observable.Timer
20. Přechod z jiných vzorů Observable.FromEvent Observable.FromAsync