encrapsulation

Originally, Object Oriented Programming talks about encapsulation which means hiding all your detailed logic behind a class such that the user can only care about the application level of the function rather than trying to understand all the inner workings. However, usually, many smaller libraries or examples/framework in assignment made by professors did a poor job to describe how the function really works, nor they have provided any meaningful example about the input of the functions, ending up doing the opposite of what encapsulation originally has claimed which the developer have to look into the implementation or even the whole program just to understand what the function really do.