function createNewFolderInGoogleDrive(folderName) {
return DriveApp.createFolder(folderName);
}
Use function createNewFolderInGoogleDrive to create folder named Test folder in a Google Drive root:
var newFolder = createNewFolderInGoogleDrive('Test folder');
newFolder has Class Folder type:
// output id of new folder to log
Logger.log(newFolder.getId());