The R5RS Scheme functions assoc, assq, and assv access pairs in association lists. In this exercise we will write a similar function for property lists. More specifically, write a function get-prop with the following signature:
(get-prop key property-list)
The function should return the value of key in property-list. Like assoc, get-prop should return #f if key is not found in property-list. Here is an example REPL session with get-prop:
> (define weekday-plist (list 'monday 1 'tuesday 2 'wednesday 3 'thursday 4 'friday 5 'saturday 6 'sunday 7)) > (get-prop 'wednesday weekday-plist) 3 > (get-prop 'sunday weekday-plist) 7 > (get-prop 'january weekday-plist) #f
How will you handle the case where the property list is malformed - a property list with an odd number of elements?
Discuss pros and cons of property lists and get-prop, compared to association lists and assoc.