title: modifying d3.js donut chart to read from json array
body: <p>How can I modify this example to read from a JSON array instead of CSV file? I will have a static JSON string that I would like to use as "data" rather than the CSV. Any pointers will be much appreciated. </p>
  
  <pre><code>var width = 960,
  height = 500,
  radius = Math.min(width, height) / 2;
  
  var color = d3.scale.ordinal()
  .range(["#98abc5", "#8a89a6", "#7b6888", "#6b486b", "#a05d56", "#d0743c", "#ff8c00"]);
  
  var arc = d3.svg.arc()
  .outerRadius(radius - 10)
  .innerRadius(radius - 70);
  
  var pie = d3.layout.pie()
  .sort(null)
  .value(function(d) { return d.population; });
  
  var svg = d3.select("body").append("svg")
  .attr("width", width)
  .attr("height", height)
  .append("g")
  .attr("transform", "translate(" + width / 2 + "," + height / 2 + ")");
  
  d3.csv("data.csv", type, function(error, data) {
  if (error) throw error;
  
  var g = svg.selectAll(".arc")
    .data(pie(data))
  .enter().append("g")
    .attr("class", "arc");
  
   g.append("path")
    .attr("d", arc)
    .style("fill", function(d) { return color(d.data.age); });
  
   g.append("text")
    .attr("transform", function(d) { return "translate(" + arc.centroid(d) + ")"; })
    .attr("dy", ".35em")
    .text(function(d) { return d.data.age; });
  });
  
  function type(d) {
  d.population = +d.population;
  return d;
  }
  </code></pre>
  
  <p>Sample JSON data: </p>
  
  <pre><code>[
  {
  "age": "&lt;5",
  "population": 2704659
  },
  {
  "age": "5-13",
  "population": 4499890
  },
  {
  "age": "14-17",
  "population": 2159981
  },
  {
  "age": "18-24",
  "population": 3853788
  },
  {
  "age": "25-44",
  "population": 14106543
  },
  {
  "age": "45-64",
  "population": 8819342
  },
  {
  "age": "≥65",
  "population": 612463
  }
  ]
  </code></pre>
  
  <p>This is an example from the following link. <a href="https://bl.ocks.org/mbostock/3887193" rel="nofollow">Original Example</a></p>