line chart in d3v4

<!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 width = 800;
    var height = 300 ;
    var margin = {top: 20, bottom:20, left: 20, right: 20};
    var dataset = [
  {date: new Date(2007, 3, 24), value: 3.24},
  {date: new Date(2007, 3, 25), value: 85.35},
  {date: new Date(2007, 3, 26), value: 78.84},
  {date: new Date(2007, 3, 27), value: 99.92},
  {date: new Date(2007, 3, 30), value: 29.80},
  {date: new Date(2007, 4,  1), value: 69.47},
    ];
    
    //scales
    var xExtent = d3.extent(dataset, d => d.date);
    var xScale = d3.scaleTime()
    	.domain(xExtent).range([0, width - margin.right]);
    var xAxis = d3.axisBottom().scale(xScale);
    
    var yMax = d3.max(dataset, d => d.value);
    var yScale = d3.scaleLinear()
    	.domain([0, yMax]).range([height, 0]);
    var yAxis = d3.axisLeft().scale(yScale);
    
    var svg = d3.select('svg').append('g')
    	.attr('transform', 'translate(40,20)');
    
    var line = d3.line()
    	.x(d => xScale(d.date))
    	.y(d => yScale(d.value));
    
    svg.selectAll('path')
    	.data([dataset]).enter().append('path')
    	.attr('d', line)
    	.attr('fill', 'none')
    	.attr('stroke', 'blue');
    
    // axis
    svg.append('g')
    	.attr('class', 'xAxis')
    	.call(xAxis)
    	.attr('transform', 'translate('+[0, height] +')');
    
    svg.append('g')
    	.attr('class', 'yAxis')
    	.call(yAxis);
  </script>
</body>

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