abbreviateNumbers.js

/**
 * this function will abbreviate a number to a string
 * It's only for charts as it takes into account the label range
 * and shortens accordingly.
 *
 * @param {Number} value
 * @param {Number} min
 * @param {Number} max
 * @param {Number} minimumFractionDigits
 * @param {Number} labelCount
 * @returns {String}
 *
 */
function abbreviateValueforChartLabels(value, min, max, minimumFractionDigits = 0, labelCount = 0) {
  // calculate the range between min and max
  const range = (max - min) / labelCount;

  // if the value is between -1k and 1k or the range is below 1k, or the value is 0, return the number as a string
  if ((Math.abs(value) < 1000 && range <= 1000) || value === 0) {
    return value.toLocaleString('de-DE', { minimumFractionDigits });
  }

  // get sign of the value
  const sign = Math.sign(value);

  const absValue = Math.abs(value);

  // define suffixes and calculate the log of the absValue
  const suffixes = ['', 'k', 'M', 'G', 'T', 'P', 'E'];
  const logValue = Math.log10(absValue);

  // calculate the suffix index
  const suffixIndex = Math.floor(logValue / 3);

  // abbreviate the absValue
  let abbreviated = absValue / Math.pow(10, 3 * suffixIndex);

  // calculate the range adjusted to the suffix
  const rangeAdjusted = range / Math.pow(10, 3 * suffixIndex);

  // if the range adjusted is below one, calculate the number of decimals needed
  if (rangeAdjusted < 1) {
    const decimalsNeeded = Math.ceil(-Math.log10(rangeAdjusted));
    abbreviated = abbreviated
      .toFixed(decimalsNeeded)
      .replace('.', ',')
      .replace(/(\d+),0+$/, '$1');
  } else {
    // otherwise, round the absValue
    abbreviated = Math.round(abbreviated);
  }

  // return the abbreviated value with the correct suffix and add the sign if negative
  if (sign === -1) {
    return `-${abbreviated.toString().replace('.', ',') + suffixes[suffixIndex]}`;
  }

  return abbreviated.toString().replace('.', ',') + suffixes[suffixIndex];
}