D3 Examples - d3-challenge-1

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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 {
      height: 100%;
      width: 100%;
    }
  </style>
</head>
​
<body>
  <svg></svg>
  <script>
    var city = 'San Francisco';
    var width = 900;
    var height = 300;
    var margin = {top: 20, bottom: 20, left: 20, right: 20};
    
    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] = ++d[city]; // y
        
        
      });
​
      var yExtent = d3.extent(data, d => d[city])
​
      var yScale = d3.scaleLinear()
        .domain(yExtent)
        .range([height, margin.top])
            
            var xExtent = d3.extent(data, d => d.date)
      var xScale = d3.scaleTime()
        .domain(xExtent)
        .range([30, width])
      
      
      
      var monthTicks = data
        .filter(d => d.date.getDate() === 1)
        .map(d => d.date)
      
      var yAxis = d3.axisLeft().scale(yScale)
      var xAxis = d3.axisBottom().scale(xScale)
​
      
      // append X Axis
      d3.select('svg')
        .append('g')
        .attr('transform', `translate(10, ${height + margin.top})`)     
        .call(xAxis)
      
      // append Y Axis
       d3.select('svg')
        .append('g')
        .attr('transform', 'translate(40, ' + margin.top +')')
        .call(yAxis)
      
      // append graph data
      d3.select('svg').selectAll('rect')
        .data(data)
        .enter()
        .append('rect')
        .attr('y', (d, i) => yScale(d[city]) + margin.top)
        .attr('x', (d, i) => xScale(d.date) + 10)
        .attr('height', d => height - yScale(d[city]))
        .attr('width', d => 1)
        .attr('fill', 'blue')
    });
    
​
  </script>
</body>
​
    