D3 Examples - scale

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>
​
<body>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
    var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500);
    
        var scale = d3.scaleQuantile()
        .domain([0, 2, 6, 7, 9])
        //.range(["A","B"]);
        //.range(["A","A","A","B","B","B","B","C","D","D"]);
        .range(["A","B","C","D"]);
    
    var result1 = scale(9);
    var result2 = scale.invertExtent('D');
    
    svg.append("text")
      .text(result1)
      .attr("y", 100)
      .attr("x", 120)
      .attr("font-size", 36)
      .attr("font-family", "monospace");
    
        svg.append("text")
      .text(result2)
      .attr("y", 200)
      .attr("x", 120)
      .attr("font-size", 36)
      .attr("font-family", "monospace")
    
    
  </script>
</body>
​
    