D3 Examples - ONS colours for graphs

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<!DOCTYPE html>
<head>
  <meta charset="utf-8">
  <script src="https://d3js.org/d3.v4.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/lodash.js/4.15.0/lodash.min.js"></script>
  <script src="https://npmcdn.com/babel-core@5.8.34/browser.min.js"></script>
  <script type="text/javascript" src="https://cdn.jsdelivr.net/gh/gka/chroma.js/chroma.min.js"></script>
​
  <style>
    svg {
      width: 800px;
      height: 2000px;
    }
  </style>
</head>
​
<body>
  <svg></svg>
  <script>
​
    var threeColours=['#53759e','#9ad859','#79c6c1'];
    var fourColours=["#a0e85b", "#9d6190", "#569160", "#f33bea"]
    var fiveColours=["#8c75d2", "#758c45", "#891b9b", "#abd533", "#552a61"]
    var sixColours=["#3e76ad","#339a59","#e2bc22","#74abc5","#601552","#dc98ff"]
       
    var colors = [];
    threeColours.forEach(function(d){makecolours(d)})
    fourColours.forEach(function(d){makecolours(d)})
    fiveColours.forEach(function(d){makecolours(d)})
    sixColours.forEach(function(d){makecolours(d)})
    var svg = d3.select('svg');
    
    var perRow = 2;
    var size = 90;
    var g = svg.selectAll('g')
        .data(colors).enter().append('g')
        .attr('transform', (d, i) => {
        var x = (i % perRow + 1) * size;
        var y = (Math.floor(i / perRow) + 1) * size;
        return 'translate(' + [x, y] + ')';
      }).attr('fill', d => d);
    
    g.append('circle')
        .attr('r', size / 4);
    
    g.append('text')
        .attr('y', size / 4 + 15)
        .attr('text-anchor', 'middle')
        .attr('dy', '.35em')
        .text((d, i) => d);
    
    function makecolours(d){
//       colors.push(chroma(d).darken(0.5).desaturate(0.5).hex())
//       colors.push(chroma(d).darken(0.5).hex())
      colors.push(chroma(d).darken(0.5).saturate(0.5).hex())
//       colors.push(chroma(d).desaturate(1).hex())
      colors.push(chroma(d).hex())
//       colors.push(chroma(d).saturate(1).hex())
//       colors.push(chroma(d).brighten(0.5).desaturate(0.5).hex())
//       colors.push(chroma(d).brighten(0.5).hex())
//       colors.push(chroma(d).brighten(0.5).saturate(0.5).hex())
    }
​
  </script>
</body>
​
    