D3 Fundamentals - Drawing with Data

<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <title>Drawing SVG Shapes with D3</title>
  <style>
    body { margin:0;position:fixed;top:0;right:0;bottom:0;left:0; }
  </style>
</head>

<body>
  <script>
    var w = 200;
    var h = 100;
    var padding = 2;
    var dataset = [5, 10, 15, 20, 25];
    
    var svg = d3.select("body")
    						.append("svg")
    						.attr("width", w)
    						.attr("height", h)
    
    svg.selectAll("rect")							// Take all the rect and create new ones
    	.data(dataset)									// for all the diff elements in dataset
    	.enter()												// If there aren't any on the page, create them
      .append("rect")									// Append rect
    		.attr("x", function(d, i) {		// Access data and index of dataset array
      		return i * (w / dataset.length);					
    		})
    		.attr("y", function(d) {
      		return h - (d * 4);
    		})
    		.attr("width", w / dataset.length - padding)
    		.attr("height", function(d) {
      		return d * 4;
    		})
    		.style("fill", "darkseagreen");

</script>
</body>

https://d3js.org/d3.v4.min.js