D3 Examples - custom

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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>
    var current = 362;
    var yesterday = 200;
    
    function relative(value, referrence) {
      return -1+(value/referrence)
    }
    
    function toPercentageString(n) {
      r = n > 0 ? "+" : "";
      r = r + Math.floor(n * 100) + "%";
      return r.replace(".", ",");
    }
    
    function getDirection(n) {
      return n > 0 ? "🔺" : "🔻";
    }
    
    // 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 rYesterday = relative(current, yesterday);
    var percentYesterday = toPercentageString(relative(current, yesterday));
    svg.append("text")
      .text(current + "(" + percentYesterday + ")" + getDirection(rYesterday))
      .attr("y", 200)
      .attr("x", 120)
      .attr("font-size", 36)
      .attr("font-family", "monospace");
​
    svg.append("text")
      .text("ocurrences")
      .attr("y", 249)
      .attr("x", 120)
      .attr("font-size", 36)
      .attr("font-family", "monospace")
    
    
  </script>
</body>
​
    