Reading values from a Vector by Index
We can read values in a vector by the index, the location each value is in the vector, starting from zero.
nth function gives us the value at a specific location in the vector.
(nth [5 10 15] 1) ;=> 10
How many values in our vector
count gives us the number of items in a vector.
Extracting values from vectors
Create some vectors and count the values in a vector