in_channel_target: getChannelPercentage()

in correlations.js [406:540]
122 lines of code
6 McCabe index (conditional complexity)

              in_channel_target: getChannelPercentage(
                channel_target,
                elem.item
              ),
              in_channel: getChannelPercentage(channel, elem.item),
            };
          });
      });
  }

  function getChannelsProperties(product) {
    return loadChannelsDifferencesData(product)
      .then(() =>
        ["release", "beta", "nightly"].map((channel) =>
          channelsData[channel].map(
            (longitudinalElem) => Object.keys(longitudinalElem.item)[0]
          )
        )
      )
      .then((all_props_per_channel) =>
        [].concat.apply([], all_props_per_channel)
      )
      .then((all_props) => new Set(all_props))
      .then((props) => Array.from(props));
  }

  function getChannelsValues(product, property) {
    return loadChannelsDifferencesData(product)
      .then(() =>
        ["release", "beta", "nightly"].map((channel) =>
          channelsData[channel]
            .filter(
              (longitudinalElem) =>
                Object.keys(longitudinalElem.item).indexOf(property) != -1
            )
            .map((longitudinalElem) => longitudinalElem.item[property])
        )
      )
      .then((all_values_per_channel) =>
        [].concat.apply([], all_values_per_channel)
      )
      .then((all_values) => new Set(all_values))
      .then((values) => Array.from(values));
  }

  function getChannelsPercentage(product, channel, property, value) {
    return loadChannelsDifferencesData(product).then(() =>
      channelsData[channel].find(
        (longitudinalElem) =>
          Object.keys(longitudinalElem.item).indexOf(property) != -1 &&
          longitudinalElem.item[property] == value
      )
    );
  }

  function text(textElem, signature, channel, product, show_ci = false) {
    loadCorrelationData(signature, channel, product).then((data) => {
      textElem.textContent = "";

      if (!(product in data)) {
        textElem.textContent =
          "No correlation data was generated for the '" +
          product +
          "' product.";
        return;
      }

      if (
        !(signature in data[product][channel]["signatures"]) ||
        !data[product][channel]["signatures"][signature]["results"]
      ) {
        textElem.textContent =
          'No correlation data was generated for the signature "' +
          signature +
          '" on the ' +
          channel +
          " channel, for the '" +
          product +
          "' product.";
        return;
      }

      let correlationData =
        data[product][channel]["signatures"][signature]["results"];

      let total_reference = data[product][channel].total;
      let total_group = data[product][channel]["signatures"][signature].total;

      textElem.textContent = sortCorrelationData(
        correlationData,
        total_reference,
        total_group
      ).reduce((prev, cur) => {
        let support_group = toPercentage(cur.count_group / total_group);
        let support_reference = toPercentage(
          cur.count_reference / total_reference
        );
        let support_diff = toPercentage(
          Math.abs(
            cur.count_group / total_group -
              cur.count_reference / total_reference
          )
        );

        let ci = confidenceInterval(
          cur.count_group,
          total_group,
          cur.count_reference,
          total_reference
        );

        let support_diff_incertezza = toPercentage(
          Math.abs(
            Math.abs(ci[0]) -
              Math.abs(
                cur.count_group / total_group -
                  cur.count_reference / total_reference
              )
          )
        );

        let res =
          prev +
          "(" +
          support_group +
          "% in signature vs " +
          support_reference +
          "% overall, difference " +
          support_diff +
          "±" +
          support_diff_incertezza +
          "%) " +
          itemToLabel(cur.item);

        if (cur.prior) {