D3 Examples - selections: enter example

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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>
    var data = [100,250,175, 200,20];
        var height = 250;
    var width = 50;
    var svg = d3.select('svg');
        svg.style('overflow', 'visible');
        var rect = svg.selectAll('rect')
        .data(data)
      .enter()
      .append('rect')
        .attr('x', (d, i) => i*width)
        .attr('y', d => height-d)
        .attr('width', width)
        .attr('height', d => d)
        .attr('fill', (d) => d === 175 ? '#f00' : '#00f' )
        .attr('stroke', '#fff');
    
    console.log(rect);
    
  </script>
</body>
​
    