second

<!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 = 'San Francisco';
    var width = 900;
    var height = 300;
    
    // dataset of city temperatures across time
    d3.tsv('data.tsv', (err, data) => {
      // clean the data
      data.forEach(d => {
        d.date = new Date(d.date); // x
        ++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);
      // or use extent, which gives back [min, max]
      var extent = d3.extent(data, d => d[city]);
      console.log(extent);

// try different scales, change the ranges, see what happens
      var yScale = d3.scaleLinear()
        .domain(extent)
        .range([height, 0]);
      
      // try passing in tick valuess
     	var yAxis = d3.axisLeft()
      	.scale(yScale);
      
      d3.select('svg').append('g')
        .attr('transform', 'translate(40, 20)')
      	.call(yAxis);
    });
  </script>
</body>

https://d3js.org/d3.v4.min.js