Adapting JavaScript APIs for RxJS
Just like in the world of .NET, APIs that are available to us in the browser aren't RxJS-aware by default. However, JavaScript actually has an advantage compared to .NET—every API that does something non-trivial like write to a file or send a network request is asynchronous, via a callback method.
We've already seen how to wrap asynchronous methods like this via the FromCallbackPattern() example, and in RxJS it's even easier. In the following, let's take a look at how we could wrap a new API, the HTML5 Geolocation API:
getCurrentPositionRx = function(opts) {
opts = opts || {};
var ret = new Rx.AsyncSubject();
// Our callbacks will just OnNext the Subject, similar to how FromAsyncPattern
// works. navigator.geolocation.getCurrentPosition( ...Get Programming Reactive Extensions and LINQ now with the O’Reilly learning platform.
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