@hackoregon/utils/src/utils/ungroupBy.js

Common utils for CIVIC

/*
 function ungroupBy
 @data: array of objects with the same properties
 @dataSeriesKeys: array of strings of properties of data
 @dataSeriesLabels: optional array of strings with labels for dataSeriesKeys
*/

const ungroupBy = (data, dataSeriesKeys, dataSeriesLabels) => {
  const arr = [];
  const labels = [];

  if (!dataSeriesLabels) {
    labels.push(...dataSeriesKeys);
  } else if (dataSeriesKeys.length === dataSeriesLabels.length) {
    labels.push(...dataSeriesLabels);
  } else {
    labels.push(...dataSeriesKeys);
  }

  dataSeriesKeys.forEach((key, index) => {
    arr.push(
      ...data.map(obj => {
        const retObj = Object.assign({}, obj);
        retObj.value = obj[key];
        retObj.type = labels[index];
        dataSeriesKeys.forEach(k => delete retObj[k]);
        return retObj;
      })
    );
  });
  return arr;
};

export default ungroupBy;