code: function nextObject(cursor, callback) {
    const Cursor = require('../cursor');
  
    if (cursor.s.state === Cursor.CLOSED || (cursor.isDead && cursor.isDead()))
      return handleCallback(
        callback,
        MongoError.create({ message: 'Cursor is closed', driver: true })
      );
    if (cursor.s.state === Cursor.INIT && cursor.s.cmd.sort) {
      try {
        cursor.s.cmd.sort = formattedOrderClause(cursor.s.cmd.sort);
      } catch (err) {
        return handleCallback(callback, err);
      }
    }
  
    // Get the next object
    cursor._next((err, doc) => {
      cursor.s.state = Cursor.OPEN;
      if (err) return handleCallback(callback, err);
      handleCallback(callback, null, doc);
    });
  }
docs: Get the next available document from the cursor, returns null if no more documents are available.