D3 Examples - re-render elements

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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>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
    let scale = d3.scaleLinear().domain([1,10]).range([1, 300]);
    var svg = d3.select("body").append("svg")
      .attr("width", 360)
      .attr("height", 500)
​
    let render = (data, color) => {      
      let rects = svg.selectAll("rect").data(data);
      rects.exit().remove();
​
      rects.enter().append("rect")
        .attr("y", 20)
        .attr("x", scale)
              .attr("width",  20)
            .attr("height", 20)
        .merge(rects)
        .attr("fill", color)
    }
    
​
      render([1, 2, 2.5],     "red");
      render([1, 2, 3, 4, 5], "blue");
​
    
  </script>
</body>
​
    