This example shows how it is possible to use crossfilter bar charts (up to any number) to visually subset a choropleth. The map above shows the population and per-capita income growth of the US from 2011-2012.
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The introduction to Reactive Programming you've been missing
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.