Exercises
- Can you extend the Ruby Array class to add similar support as in R to construct a continuous number sequence and to index through an array? 
 - Compare the supported operations for arrays in other languages.
 - An array may be large, so it is useful to have a search method.  In Ruby, we inquire whether an array supports a method such as grep.  Let's take a leap of faith and try grep on the method array.  Running Array.public_methods.grep "grep" you will find the answer is no.  The returned array is empty.  But this seems contradictory.  Haven't we just used grep on an array?
 
August 29, 2012