D3 Examples - Temperature line chart with scales

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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>
    const city = 'Austin';
    const width = 800;
    const height = 300;
    const margin = {top: 20, bottom: 20, left: 20, right: 20};
    
    // dataset of city temperatures across time
    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] = parseFloat(d[city]); // y
      });
      
      // scales
      const xExtent = d3.extent(data, d => d.date);
      
      const xScale = d3.scaleTime()
        .domain(xExtent)
        .range([margin.left, width - margin.right]);
      
      const xAxis = d3.axisBottom()
        .scale(xScale)
        .tickFormat(d => d3.timeFormat('%b, %Y')(d));
      
      const yExtent = d3.extent(data, d => d[city]);
      
      const yScale = d3.scaleLinear()
        .domain(yExtent)
        .range([height - margin.bottom, margin.top]);
      
      const heightScale = d3.scaleLinear()
        .domain(yExtent)
        .range([0, height - margin.top - margin.bottom])
    
      const yAxis = d3.axisLeft()
        .scale(yScale);
        
      const line = d3.line()
        .x(d => xScale(d.date))
        .y(d => yScale(d[city]));
      
      const svg = d3.select('svg');
      svg.append('path')
        .attr('d', line(data))
        .attr('fill', 'none')
        .attr('stroke', "green");
​
       svg.append('g')
        .attr('transform', 'translate(' + [margin.left, 0] + ')')
        .call(yAxis);
      
       svg.append('g')
        .attr('transform', 'translate(' + [0, height - margin.bottom] + ')')
        .call(xAxis);   
      
    });
  </script>
</body>
​
    