Output data types.
Output only values with a type that is SCALAR
Rearrangement
Revised, fixed wrong array to string conversion.
Create file and add exercise arrays.
Print book's tiltes
Print titles and key values about each book.
messed up foreach, need to fix.
Print all even numbers from 1 to 100 using continue.
Print numbers from 1 to 100 but stops after 10 using brake.