Chapter 3

1. What's the difference between an exported and an unexported symbol?
   Exported symbols can be used by other packages, whereas unexported symbols cannot. The first group has an identifier that starts with a capital letter, while the second group does not.
2. Why are custom types important?
   Custom types allow methods to be defined and interfaces to be used effectively, or the data structure of another type to be inherited, but getting rid of its methods.
3. What is the main limit of a short declaration?
   Short declarations do not allow the variable type inferred by the value to be defined. A type casting of the value enables this limitation to be overcome.
4. What is scope and how does it affect variable shadowing?
   The scope of a variable represents its lifetime and visibility that can be package, function, or blocked. Shadowing is when the same identifier gets used...