March 12, 2010, 5:17 am

M206 Computing: An Object-oriented Approach

FAQ

 

This represents a list of questions that some students have asked. Hopefully the answers will help others.

1. Can you explain the difference between affordance and visibility?
2. Is there a difference between a message answer and the textual representation of a message answer?
3. Could you explain to me the concept of classes as instances of metaclasses?
4. Why does 3.1 == 3.1 return false?
5. Are floats immutable?
6. Should we use ByteString or TwoByteString?
7. Is it possible to reset the attributes of an initialised object to different types of objects?
8. What is the difference between an instance method and a class method?
9. I would like to know why we have a string literal defined as '123' and a number literal defined as 123? Why have two different ways to define an object and how would we use them?
10. Can you give an example that might help me understand how to use block arguments?
11. How do you append a character to a string?

Copyright © 2010 John McSweeney