Google App Script (Javascript) to move all files in a particular Google Drive folder to another folder

moveAllFiles.gs

/**
 * Function to move all files in a particular Google Drive folder to another folder
 * @param {string} moveFromFolderId - the original Google Drive folder ID from which you want to move the files
 * @param {string} moveToFolderId - the Google Drive folder ID to which you want to move the files
 */
function moveAllFiles(moveFromFolderId, moveToFolderId) {
  var moveFrom = DriveApp.getFolderById(moveFromFolderId);
  var moveTo = DriveApp.getFolderById(moveToFolderId);
  
  var files = moveFrom.getFiles();
  while (files.hasNext()) {
    var file = files.next();
    moveTo.addFile(file);
    moveFrom.removeFile(file);
  }
}

// This one-by-one method takes too much time if you want to move a bulk of files at once.