D3 Examples - D3 bar chart with animation

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <style>
    rect {
      fill: none;
      stroke: black;
      stroke-width: 1;
    }
  </style>
</head>
​
<body>
  <script>
    
    var n = 10;
    var w = 960;
    var h = 500;
​
    var svg = d3.select("body").append("svg")
      .attr("width", w)
      .attr("height", h);
​
    var data = d3.range(n).map(function() {
      return Math.random();
   });
​
    var x = d3.scaleBand()
        .rangeRound([0, w])
        .domain(d3.range(n));
    
    var y = d3.scaleLinear()
        .domain([0, d3.max(data)])
        .range([0, h]);
    
    var color2 = d3.scaleLinear()
                    .domain([0, d3.max(data)])
                    .range(["yellow", "green"])
    
        svg.selectAll("rect").data(data)
        .enter()
            .append("rect")
        .attr("width", 50)
        .attr("height", function(d) { return y(d); })
        .attr("x", function(d, i) { return i * 55; })
        .attr("y", function(d) { return 200 - y(d); })
            .style("fill", color2)
​
    setInterval(function(d) {
​
      data = d3.range(data.length).map(function() {
        return Math.random();
      });
​
      color2.domain([0, d3.max(data)])
                        .range(["yellow", "green"])
      y.domain([0, 1])
         .range([0, 100]);
      
      svg.selectAll("rect").data(data).transition()
        //.attr("duration", 1000)
        //.attr("delay", function(d, i) { return i*1000;})
        .attr("height", function(d) { return y(d); })
        .attr("y", function(d) { return 200 - y(d); })
            .style("fill", color2)
​
    }, 500);
    
  </script>
</body>
​
    