gistfile1.txt

var UK = d3.locale({
  "decimal": ".",
  "thousands": ",",
  "grouping": [3],
  "currency": ["£", ""],
  "dateTime": "%a %b %e %X %Y",
  "date": "%m/%d/%Y",
  "time": "%H:%M:%S",
  "periods": ["AM", "PM"],
  "days": ["Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday"],
  "shortDays": ["Sun", "Mon", "Tue", "Wed", "Thu", "Fri", "Sat"],
  "months": ["January", "February", "March", "April", "May", "June", "July", "August", "September", "October", "November", "December"],
  "shortMonths": ["Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"]
});

...

// Getting M, B thousands etc.
// https://github.com/d3/d3/issues/2241

var formatSi = UK.numberFormat("$.2s");

function formatAbbreviation(x) {
  var s = formatSi(x);
  switch (s[s.length - 1]) {
    case "G": return s.slice(0, -1) + "B";
  }
  return s;
}

 var chartTotalSpend = dc.numberDisplay("#total-transfer-spend");
 chartTotalSpend
     .formatNumber(formatAbbreviation)
     .valueAccessor(function (d) {
         return d;
     })
     .group(totalFeesSeasonal);