Reading Form Input and Send Email

/** MAIN method 
 *  Runs whenever a form is submitted by user
*/
const onFormSubmit = (e) => {

  try {

    /**
     * Documention for most objects can be found starting at https://developers.google.com/apps-script/reference/forms/form-response
     * When you are in the Form editor, you create "Items"
     * When you submit a completed form, an object is passed to the script with a "response" property
     * The response property is of the type "FormResponse"
     * A FormResponse includes an array of responses to every answerable ITEM within the form for which the respondent provided an answer
     *    getItemResponses() returns an array of type "ItemResponse"
     * An ItemResponse has an "Item" (getItem()) and a "Response" (getResponse())
     *    The Item must be cast as a type before use https://developers.google.com/apps-script/reference/forms/item
     *    The Response is an array of responses to answerable items on the form.
     *        In the case of a grid, a entry is in included in the response array only if user has provided an answer to at least one row
     * 
     * For a "GridItem" (Item cast as a GridItem)
     *    The item starts with a "Title"
     *    The item has "Rows" (text) and "Columns" (text)
     *    Row responses can't be accessed through the GridItem. You must retireve the row responses as an array through the ItemResponse object (which is the parent of the GridItem object)
     */


    let formResponse = e.response;  // formResponse : FormResponse
    let itemResponses = formResponse.getItemResponses(); // itemResponses : ItemResponse[]

    let currentUser = formResponse.getRespondentEmail();

    let objItems = []; // objItems : array of objItem

    itemResponses.forEach(itemResponse => { // itemResponse : ItemResponse - A response to one answerable item within the form

      let item = itemResponse.getItem(); //item : Item
      let response = itemResponse.getResponse(); // response : String[] in case of GridItem questions (the answer at index n corresponds to the question at row n + 1 in the grid. If no answer, that answer is returned as '')

      // A Grid Item includes the "title" (first line of text) followed by "rows" (the text part of each row)
      if (item.getType() == "GRID") {

        let gridItem = item.asGridItem(); // gridItem : GridItem - Returns item as GridItem. Throws a scripting exception if the ItemType was not already GRID
        let rows = gridItem.getRows(); // rows : String[] - Gets the text part for every row in the grid. 
        let title = gridItem.getTitle(); // title : String - Gets the text that is at the top of the item
        let index = gridItem.getIndex(); // index : int
        let columns = gridItem.getColumns(); // columns : String[] - Gets the possible column values 

        let objItem = new Object();
        objItem['title'] = title;
        objItem['index'] = index;
        objItem['rows'] = mergeRowsAndResponse(rows, response);

        objItems.push(objItem);
      }
    });


    let values = objItems;


    // Construct html and text bodies.  Send EMail
    //const [htmlBody, textBody] = constructAddContent(values);
    const [htmlBody, textBody] = constructEMailBody(HTML_TEMPLATE, TEXT_TEMPLATE, values);
    sendEmailText(textBody, currentUser, "subject", htmlBody);

  } catch (err) {
    Logger.log(err);
    MailApp.sendEmail('wayde_johnson@dpsnc.net', 'Error in onFormatSubmit', err);
  }
}