D3 Examples - D3 - Enter 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; }
 
    #chart {
      margin: 3em;
    }
    .bar {
      background-color: blue;
        height: 20px;
        margin-top: 2px;
    }
  </style>
</head>
​
<body>
  
  <svg id="chart"></svg>
  
  <script>
    var rectWidth = 50;
    var chartHeight = 400;
    var chartWidth = 700;
    
    var data = [200, 60, 100, 80, 10];
​
    var svg = d3.select('#chart')
        .attr('height', chartHeight)
        .attr('width', chartWidth);
    
        svg.selectAll('rect')
        .data(data)
        .enter().append('rect') // new line
        .attr('x', function(d, i){
        return i * rectWidth;
        })
        .attr('y', function(d){
        return chartHeight - d;
        })
        .attr('width', rectWidth)
        .attr('height', function(d){
        return d;
        })
        .attr('fill', 'blue')
        .attr('stroke', '#FF00FF')
        .attr('stroke-width', '2');
​
  </script>
</body>
​
    