Just as in the previous answer, it depends on whether the employee is covered by a contract. If an employee is about to give notice, he or she must follow the terms of his or her union or employment contract. If there is no contract, then the employee must follow the rules set out by the employer about notice. These rules are usually found in the employee manual.
When leaving a job, the employee should make every effort to leave the job in a professional manner. This means that an employee should provide a certain amount of notice for the employer before leaving the job. In the majority of businesses, two-week notice is considered proper. Some employers ask for more notice due to the type of business. Make sure that you review the section in the employee manual on giving notice before you quit your job.
The major reason an employee should provide notice is to protect his or her business reputation. Many employers consider walking off a job without giving notice to be a major affront to the employer. Although the employee may want to do that to get back at the employer, that type of behavior can only hurt the employee. While many states may limit what a former employer can say about an employee to a potential future employer, sometimes a person’s reputation is injured by former co-workers who talk to friends they have outside of the office.