D3 Examples - temperatures line chart (FEM)

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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>
  
  <script>
    
    var width = 800;
    var height = 300;
    margin = {top: 20, bottom: 20, left: 20, right: 20};
    
    var city = 'New York';
    
    
    d3.tsv('data.tsv', function(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
      });
      
      
      // scales
      var xExtent = d3.extent(data, d => d.date);
      var xScale = d3.scaleTime()
        .domain(xExtent)
        .range([margin.left, width-margin.right])
      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 svg = d3.select("body").append("svg")
      
      // NOTE: associate data to path no the line!
      
      var line = d3.line()
        .x(d => xScale(d.date))
        .y(d => yScale(d[city]))
​
      
      console.log('line:' + line)
      
      svg.selectAll('path')
        .data([data]).enter()
        .append('path')
        .attr('d', line)
        .attr('fill', 'none')
        .attr('stroke', 'purple')
      
      
      
      
      // axis
      var xAxis = d3.axisBottom()
        .scale(xScale)
        .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>
​
    