D3 Examples - 03/13/18 class problem

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contig histogram
<!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; }
    
.bar rect {
  fill: Indigo;
}
​
.bar text {
  fill: #fff;
  font: 10px sans-serif;
}
    
  </style>
</head>
​
<body>
  <script>
    // Feel free to change or delete any of the code you see in this editor!
    var svg = d3.select("body").append("svg")
      .attr("width", 960)
      .attr("height", 500)
​
        var usv = d3.dsvFormat("_");
    var headers = [];
​
    // this is the parse
    
    var output = usv.parse(">NODE_length_135_cov_6.362500")
    //console.log(output)
    
    d3.request("Test.Fasta")
        .mimeType("text/plain")
            .response(function(xhr) { return usv.parse(xhr.responseText) }) 
    // function that access information from a URL
        .get(function(data) {
        //console.log("data: ", data)
        data.forEach(function (d){
          if (d.node == ">NODE"){
            headers.push("size: ", +d.size)
          }
        })
        console.log ("headers: ", headers);
      
​
var data = d3.range(1000).map(d3.randomBates(10));
​
var formatCount = d3.format(",.0f");
​
var svg = d3.select("svg"),
    margin = {top: 10, right: 30, bottom: 30, left: 30},
    width = +svg.attr("width") - margin.left - margin.right,
    height = +svg.attr("height") - margin.top - margin.bottom,
    g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")");
​
var x = d3.scaleLinear()
    .rangeRound([0, width]);
​
var bins = d3.histogram()
    .domain(x.domain())
    .thresholds(x.ticks(43))
    (data);
​
var y = d3.scaleLinear()
    .domain([0, d3.max(bins, function(d) { return d.length; })])
    .range([height, 0]);
​
var bar = g.selectAll(".bar")
  .data(bins)
  .enter().append("g")
    .attr("class", "bar")
    .attr("transform", function(d) { return "translate(" + x(d.x0) + "," + y(d.length) + ")"; });
​
bar.append("rect")
    .attr("x", 1)
    .attr("width", x(bins[0].x1) - x(bins[0].x0) - 1)
    .attr("height", function(d) { return height - y(d.length); });
​
bar.append("text")
    .attr("dy", ".75em")
    .attr("y", 6)
    .attr("x", (x(bins[0].x1) - x(bins[0].x0)) / 2)
    .attr("text-anchor", "middle")
    .text(function(d) { return formatCount(d.length); });
​
g.append("g")
    .attr("class", "axis axis--x")
    .attr("transform", "translate(0," + height + ")")
    .call(d3.axisBottom(x));
​
    
  });
    
​
    
  </script>
</body>
    