Google Drive

Create a new folder
Create a new file in a folder
List of files in a folder

Create a new folder


function createNewFolder(){
  const name = 'newFolderName';
  const newFolder = DriveApp.createFolder(name);
  Logger.log('newFolderId -> ' + newFolder.getId());
}

Create a new file in a folder


function createNewFileInFolder(){
  const folderId = '1234ABCD';
  const folder = DriveApp.getFolderById(folderId);
  const fileName = 'newFile';
  const newFile = folder.createFile(fileName, 'Hello, world');
}

List of files in a folder


function listOfFilesInFolder(){
  const folderId = '1234ABCD';
  const files = DriveApp.getFolderById(folderId).getFiles();
  while (files.hasNext()) {
    const file = files.next();
    Logger.log('fileId-> ' + file.getId() + ', fileName-> ' + file.getName());
  }
}