Paths (Line Graph)

<!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; }
  </style>
</head>

<body>
  <svg></svg>
  <script>
    var width = 900
    var height = 400
    var padding = {top: 20, left: 40, right: 20, bottom: 40}
    var city = 'New York'; 
    
		d3.tsv('data.tsv', (err, data) => {
      // clean data
      data.forEach(d => {
        d.date = d3.timeParse('%Y%m%d')(d.date)
        d[city] = +d[city]
      })
      
      // setup extents
      console.log(data)

var xExtent = d3.extent(data.map(d => d.date))
      var yExtent = d3.extent(data, d => d[city])

console.log(xExtent)
      console.log(yExtent)

// setup scales
      var xScale = d3.scaleTime()
      	.domain(xExtent)
      	.range([padding.left, width - padding.right])
      
      var yScale = d3.scaleLinear()
      	.domain(yExtent)
      	.range([height - padding.bottom, padding.top])
      
      var xColorScale = d3.scaleTime()
      	.domain(xExtent)
      	.range[0, 1]

// draw svg
      var svg = d3.select('svg')
        .attr('width', width)
        .attr('height', height)
      
      var xAxis = d3.axisBottom(xScale)
      	.tickFormat(d3.timeFormat('%b %Y'))
      var yAxis = d3.axisLeft(yScale)
      
      var line = d3.line()
      	.x(d => xScale(d.date))
      	.y(d => yScale(d[city]))
      	.curve(d3.curveStepAfter)
      
      // add a background
      svg.append('rect')
				.attr('x', padding.left)
      	.attr('y', padding.top)
	      .attr('width', width - padding.left - padding.right)
      	.attr('height', height - padding.top - padding.bottom)
      	.attr('fill', '#efefef')

// draw a single path for the line
      svg.append("path")
        .attr('d', line(data))
      	.attr('fill', 'none')
      	.attr('stroke', 'fuchsia')
      
      // draw x-axis
      svg.append("g")
      	.attr('transform', 'translate(0,'+(height-padding.bottom)+')')
      	.call(xAxis)
      
      // draw y-axis
      svg.append("g")
      	.attr('transform', 'translate('+padding.left+',0)')
      	.call(yAxis)
    })

</script>
</body>

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