helpers.js

// converts array of items into object of items with item.field as a key
export const byField = (field, list) => {
  if (list && list.length > 0) {
    return list.reduce((acc, item) => {
      const keys = acc.keys || [];
      return {
        ...acc,
        keys: [...keys, item[field]],
        [item[field]]: { ...item },
      };
    }, {});
  }
  return {
    keys: [],
  };
};


// converts byId dict maked by above function to array
export const toArray = byIdDict => (
  byIdDict && byIdDict.keys
    ?
    byIdDict.keys.map(key => ({ ...byIdDict[key] }))
    :
    []
);