donavon

// Takes a snapshot of WebView control (Windows 8.1) and returns a thumbnail URL.
function getThumbnailFromWebView(webviewControl, width, height) {
    return capturePreviewToBlobAsync(webviewControl).then(function (completeEvent) {
        var blob = completeEvent.target.result;
        var streamIn = blob.msDetachStream();

        var Imaging = Windows.Graphics.Imaging;
        var transform = new Imaging.BitmapTransform();
        transform.scaledHeight = height;
        transform.scaledWidth = width;

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

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This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

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