9.5. Chapter Review

1. Distinguish the cases when you would want to use a list instead of an array, or the other way around.

2. What syntax is consistent between arrays and lists? What are comparable features, but with different syntax?

3. Here is one way to put five particular elements into a list:

   var words = new List<string>();
   string[] temp = {"a", "an", "the", "on", "of"};
   foreach(string s in temp) {
       words.Add(s);
   }
   

   How can you do this all without a loop, and with only two statements? How about with a single statement, assuming you do not need temp again?

4. If we continue on from above, with the line:

   var words2 = words;
   

   Then what would be the difference in effect between these two possible next lines?

   words.Clear()
   
   words = new List<string>();
   

5. If you delete an element from the middle of a list, what happens to the spot where you removed the element?

6. Which is true for a Dictionary: is it mutable or immutable?

7. What syntax is there for a Dictionary that matches that for a List?

8. You have been using csharprepl and it currently shows the following:

   > words
   List<string>(3)
   ┌──────┬──────────┬────────┐
   │ Name │ Value    │ Type   │
   ├──────┼──────────┼────────┤
   │ [0]  │ "Apple"  │ string │
   │ [1]  │ "Banana" │ string │
   │ [2]  │ "Cherry" │ string │
   └──────┴──────────┴────────┘
   

   What would words.Count return in csharprepl?

9. In VS Code, create a method call SortFruits. When called with a string array argument that contains three fruit names, the method:

   • turns the fruits into a string list,

   • print out the data type of the list (use .GetType()),

   • sort the fruits alphabetically, and

   • iterate through the list and print out the sorted fruit names, but

   • does not return anything to the caller.

10. In csharprepl, create a dictionary of key-value <string, string>, call it fruits, that contains three fruits and their corresponding color. Iterate through the dictionary and output each entry in one line formatted as “<fruit>” : “<color>”. Afterwards, print your full name in a separate line.