D3 Examples - learning 1.o

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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; }
    svg {
      height: 100%;
      width: 100%;
    }
  </style>
</head>
​
<body>
  <svg>
  </svg>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
    var data = [100, 200, 300, 150, 220]
    var rectWid = 100;
    var height = 300;
    a = d3.selectAll('rect')
        .data(data)
      .attr('x', (d, i) => i * rectWid)
      .attr('y', d => height - d)
      .attr('width', rectWid)
      .attr('height', d => d)
      .attr('fill', '#222')
      .attr('stroke', '#fff');
    console.log(a);
  </script>
</body>
​
    