D3 Examples - Number transformation with data

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<script src="https://d3js.org/d3.v4.min.js"></script>
<body>
<div style="margin-top: 250px;">
<h1 class="copCounter">0</h1>
</div>
</body>
<script>
var count = 3252;
var numberFormat = d3.format(",d");
ready(count);
function ready(data) {
  d3.selectAll(".copCounter")
        .transition()
        .duration(5000)
        .on("start", function repeat(d) {
        d3.active(this)
            .tween("text", function() {
              var that = d3.select(this),
                  i = d3.interpolateNumber(that.text().replace(/,/g, ""), data);
              return function(t) { that.text(numberFormat(i(t))); };
            })
          .transition()
            .delay(1500)
            .on("start", repeat);
      });
}
</script>
​
    