D3 Examples - Number of violent crimes in USA in 2015

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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
    }
    .label {
      font-size: 16pt;
      font-family: 'sans-serif';
      alignment-baseline: middle;
      fill: #ffffff;
    }
    .head {
      font-size: 20pt;
      font-family: 'Gill Sans MT';
      alignment-baseline: middle;
      fill: #890000;
    }
    .number, .subtitle {
      font-size: 16pt;
      font-family: 'sans-serif';
      alignment-baseline: middle;
      fill: #890000;
    }
    .bar {
      fill: #ad0000;
    }
    
  </style>
</head>
​
<body>
  <script>
    const width = 960;
    const height = 500
    const margin = {
      left: 50,
      right: 180,
      top: 100,
      bottom: 100
    }
    
    const svg = d3.select("body").append("svg")
      .attr("width", width)
      .attr("height", height)
    
    svg.append('text')
        .attr('class', 'head')
        .attr('x', margin.left)
        .attr('y', 85)
        .text('Number of violent crimes in the United States in 2015');
    
    const g = svg.append('g')
      .attr('transform', `translate(${margin.left}, ${margin.top})`)
    
    
    var data = [
      {
        name: "Total violent crimes",
        value: 1197704
      },
      {
        name: "Aggravated assult",
        value: 764449
      },
      {
        name: "Robbery",
        value: 327374
      },
      {
        name: "Rape",
        value: 90185
      },
      {
        name: "Murder",
        value: 15696
      }
    ]
    
    const innerWidth = width - margin.left - margin.right;
    const innerHeight = height - margin.top - margin.bottom;
    
    const xValue = d => d.value;
    const yValue = d => d.name;
​
    const xScale = d3.scaleLinear()
      .domain([0, d3.max(data, xValue)])
      .range([0, innerWidth]);
    
    const yScale = d3.scaleBand()
      .domain(data.map(yValue).reverse())
      .range([innerHeight, 0])
      .padding(0.3);
    
    const groups = g.selectAll('g').data(data);
    const groupsEnter = groups
      .enter().append('g')
        .attr('transform', d => `translate(0, ${yScale(yValue(d))})`);
    
    groupsEnter
      .append('rect')
        .attr('class', 'bar')
        .attr('width', d => xScale(xValue(d)))
        .attr('height', yScale.bandwidth())
        .attr('fill', 'black');
    
    groupsEnter
      .append('text')
        .attr('class', 'label')
        .attr('x', 5)
        .attr('y', yScale.bandwidth() / 2)
        .text(function (d) {
            if (d.name !== "Murder")
                return d.name;
        });
    
    const percentFormat = d3.format(",.1%");
    const xPercent = d => percentFormat(xValue(d) / xScale.domain()[1]);
    
    groupsEnter
      .append('text')
        .attr('class', 'number')
        .attr('x', d => xScale(xValue(d)) + 8)
        .attr('y', yScale.bandwidth() / 2)
        .text(function (d) {
                if (d.name == "Murder") {
                        return 'Murder ' + `${xValue(d)} (${xPercent(d)})`;
                } else {
                        return `${xValue(d)} (${xPercent(d)})`;
                }
        });
​
  </script>
</body>
​
    