@data-ui/histogram/esm/utils/addDensityAndCumulativeValuesToBins.js

React + d3 library for creating histograms

/* eslint no-param-reassign: 0 */
// bins should minimally have the shape
// Array<Object{ count: Number }>
export default function addDensityAndCumulativeValuesToBins(bins) {
  var cumulative = 0;
  bins.forEach(function (bin) {
    cumulative += isNaN(bin.count) ? 0 : bin.count; // eslint-disable-line no-restricted-globals

    bin.cumulative = cumulative;
  });
  var total = cumulative;
  bins.forEach(function (bin) {
    bin.density = bin.count / total;
    bin.cumulativeDensity = bin.cumulative / total;
  });
}