D3 Examples - Graphe & Date

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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; }
    
    .domain {
      display: none;
    }
​
        .YAxis line {
            stroke: #BDBDBD;
            stroke-opacity: 0.3;
        }
  </style>
</head>
​
<body>
  <svg width="960" height="500" ></svg>
  <script>
    const svg = d3.select("svg");
    const margin = {top:20, right:20, bottom:30, left:50};
    const width = svg.attr("width") - margin.left - margin.right;
    const height = svg.attr("height") - margin.top - margin.bottom;
    
    const g = svg.append("g").attr("transform", "translate(" + margin.left + "," + margin.top + ")")
    
    const x = d3.scaleTime().rangeRound([0, width]);
    const y = d3.scaleLinear().rangeRound([height, 0]);
    
    const parseDate = d3.timeParse("%Y-%m-%d");
    const displayDate = d3.timeFormat("%d-%m-%Y");
    const displayValue = d3.format(",.0f");
    
    let data = [];
    let years;
    
    d3.queue()
        .defer(d3.json, "data.json")
        .await(process);
    
    var line = d3.line()
        .x(function(d) { return x(d.year); })
        .y(function(d) { return y(d.value); });
    
    let yAxis;
    let xAxis;
    
    function process(error, json) {
      if(error) throw error;
      
      years = Object.keys(json);
      for(year of years) {
        data.push({year:parseDate(year), value:json[year]});
      }
      
      // console.log("JSON : %O", json);
      // console.log("YEARS : %O", years);
      // console.log("DATA : %O", data);
      
      draw();
    }
    
    function draw() {
      x.domain(d3.extent(data, function(d) { return d.year; }));
            y.domain([0, d3.max(data, function(d) { return d.value; })]);
      
      xAxis = g.append("g")
        .attr("transform", "translate(0," + height + ")")
        .call(d3.axisBottom(x).tickFormat(d3.timeFormat("%B %d")))
            .select(".domain")
        .remove();
      
      yAxis = g.append("g")
        .attr("class", "YAxis")
        .call(d3.axisLeft(y).tickSize(-width))
            .append("text")
        .attr("x", 10)
        .attr("y", y(y.ticks().pop()) + 0.5)
        .attr("dy", "0.32em")
        .attr("fill", "#000")
        .attr("font-weight", "bold")
        .attr("text-anchor", "start")
        .text("Nombre");
      
      g.append("path")
      .datum(data)
      .attr("fill", "none")
      .attr("stroke", "steelblue")
      .attr("stroke-linejoin", "round")
      .attr("stroke-linecap", "round")
      .attr("stroke-width", 1.5)
      .attr("d", line);
    }
  </script>
</body>
    