D3 Examples - line graph-temps in NYC

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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; }
    svg {
      width: 100%;
      height: 100%;
    }
  </style>
</head>
​
<body>
  <svg></svg>
  <script>
     var city = 'New York';
    var width = 800;
    var height = 300;
    
    var margin = {top: 20, bottom: 20, left: 20, right: 20};
    
    d3.tsv('data.tsv', (err, data) => {
      // clean the data
      data.forEach(d => {
        d.date = d3.timeParse("%Y%m%d")(d.date);
        d.date = new Date(d.date); // x
        d[city] = ++d[city]; // y
      });
    console.log(data);
      
      // scales
      var xExtent = d3.extent(data, d => d.date);
      var xScale = d3.scaleTime()
        .domain(xExtent)
        .range([margin.left, width - margin.right]);
//          var yExtent = d3.extent(data, d => d[city]);
      var yMax = d3.max(data, d => d[city]);
      var yScale = d3.scaleLinear()
        .domain([0, yMax])
        .range([height - margin.bottom, margin.top]);
      var heightScale = d3.scaleLinear()
        .domain([0, yMax])
        .range([0, height - margin.top - margin.bottom]);
      
      var line = d3.line()
        .x((d) => { return xScale(d.date); })
        .y((d) => { return yScale(d[city]); });
​
      var svg = d3.select('svg');
        svg.append('path')
        .attr('d', line(data))
        .attr('stroke', 'blue')
        .attr('fill', 'white');
      
            var xAxis = d3.axisBottom()
        .scale(xScale)
//          .tickFormat(d => d3.timeFormat('%b %Y')(d));
        .tickFormat(d3.timeFormat('%b %Y'));
      var yAxis = d3.axisLeft()
        .scale(yScale);
      
      svg.append('g')
        .attr('transform', 'translate(' + [0, height - margin.bottom] + ')')
        .call(xAxis);
      svg.append('g')
        .attr('transform', 'translate(' + [margin.left, 0] + ')')
        .call(yAxis);
       
    });
​
  </script>
</body>
​
    