D3 Examples - Simple Scale and Axis

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v5.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 = 'San Francisco';
    var width = 900;
    var height = 300;
    
    d3.tsv('data.tsv').then(data => {
      
      // Clean data
      data.forEach(d => {
        d.date = new Date(d.date); // x
        d[city] = +d[city]; // y
      });
      
            // get min/max
      var min = d3.min(data, d => d[city]);
      var max = d3.max(data, d => d[city]);
      console.log(min, max);
      
      // using extent
      var extent = d3.extent(data, d => d[city]);
      console.log(extent);
      
      // scale
      var yScale = d3.scaleLinear()
        .domain(extent)
        .range([height, 0]);
      
      var yAxis = d3.axisLeft()
        .scale(yScale);
      
      var axis = d3.select('svg').append('g')
        .attr('transform', 'translate(40, 20)')
        .call(yAxis);
      
      var text = axis.selectAll('text')
        .attr('fill', function (d) {
          return d === 64 ? 'red' : 'blue';
        });
      
      console.log(axis.node());
      console.log(text.data());
    });
​
  </script>
</body>
    