Selecting country ID from topoJSON (D3)
<p>Im following this <a href="http://www.d3noob.org/2013/03/a-simple-d3js-map-explained.html" rel="nofollow">tutorial </a> "A simple d3.js map explained". I'd like to create a map and change the colour of a single country. </p>

<p>I've simplified the tutorial to show just the map in this <a href="https://plnkr.co/edit/L0dyJboDsngOrJTe2ANh?p=info" rel="nofollow">Plunk</a></p>

<p>I think I might be able to select a country through the  id's found in the topoJSON</p>

<pre><code>   {"type": "Polygon",
    "id": 604,
    "arcs": [
      [133, -473, -448, -378, -374, -413]
     ]
   },
</code></pre>

<p>I know that UK is "id": 826. Should I be using the id to change the colour of a single country and how do I go about this?</p>