D3 Examples - city temps over time (lines/path)

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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>
<svg></svg>
<body>
  <script>
    const city = 'New York';
    const width = 800;
    const height = 300;
    const margin = {
      top: 20,
      right: 20,
      bottom: 20,
      left: 20,
    };
    const realWidth = width - (margin.left + margin.right);
    
    // temps of cities over time
    d3.tsv('data.tsv', (err, data) => {
      data.forEach(d => {
        d.date = d3.timeParse('%Y%m%d')(d.date);
        d.date = new Date(d.date); // x
        ++d[city]; // y
      });
      // Calc width to fit based on margin,qty, width
      const barWidth = realWidth * (1/data.length);
      
      // Create scales
      const xExtent = d3.extent(data, d => d.date);
      const yExtent = d3.extent(data, d => d[city]);
      const xScale = d3.scaleTime()
        .domain(xExtent)
        .range([margin.left, width - margin.right]);
      const yScale = d3.scaleLinear()
        .domain(yExtent)
        .range([height - margin.bottom, margin.top]);
​
      // Go!
      const line = d3.line()
        .x(d => xScale(d.date))
        .y(d => yScale(d[city]))
        .curve(d3.curveCatmullRom);
      const svg = d3.select('svg');
      svg.append('path')
        .attr('d', line(data))
        .attr('fill', 'none')
          .attr('stroke', 'blue')
      
      const xAxis = d3.axisBottom()
        .scale(xScale);
      const yAxis = d3.axisLeft()
        .scale(yScale);
      
      svg.append('g')
        .attr('transform', `translate(0, ${height})`)
        .call(xAxis);
      
      svg.append('g')
        .attr('transform', `translate(${margin.left}, ${margin.top})`)
        .call(yAxis);
        
      
    });
  </script>
</body>
​
    