JavaScript: Functional Programming for JavaScript Developers

Merging streams

We've already seen the zip function that merges events one-to-one to create a new stream but there are numerous other ways of combining streams. A very simple example might be a page which has several code paths which all want to perform a similar action. Perhaps we have several actions all of which result in a status message being updated:

var button1 = document.getElementById("button1"); var button2 = document.getElementById("button2"); var button3 = document.getElementById("button3"); var button1Stream = Rx.Observable.fromEvent(button1, 'click'); var button2Stream = Rx.Observable.fromEvent(button2, 'click'); var button3Stream = Rx.Observable.fromEvent(button3, 'click'); var messageStream = Rx.Observable.merge(button1Stream, button2Stream, ...