/**
 * Arrays
 * 
 * 1. All elements of an array will have the
 * same type, say T.
 * 
 * 2. All elements of an array behave exactly
 * like an ordinary variable of the array's 
 * type, T.
 * 
 * 3. An array in an object.
 * 
 * 4. The number of elements in an array
 * cannot change once we've instantiated the
 * array.
 * 
 * 5. The type of the array is T[], which is
 * read as "array of T".
 */