D3 Examples - basic rectangles with color selection

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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>
  <svg></svg>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
    var rectWidth = 50;
    var height = 200;
    var data = [100, 250, 175, 200, 120];
    
    var svg = d3.select("svg");
​
    svg.selectAll("rect")
      .data(data).enter().append('rect')
      .attr("y", d => height - d)
      .attr("x", (d, i) => i * rectWidth)
      .attr("width", rectWidth)
      .attr("height", d => d)
        .attr("fill", d => (d === 200) ? "red" : "blue")
            .attr("stroke", "#fff");
  </script>
</body>
​
    