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Exercise 2.5
Association list and property lists *

Association lists have been introduced at this page. An association list is a list of keyword-value pairs (a list of cons cells).

Property lists are closely related to association lists. A property list is a 'flat list' of even length with alternating keys and values.

The property list corresponding to the following association list

  ((a . 1) (b . 2) (c . 3))

is

  (a 1 b 2 c 3)

Program a function that converts an association list to a property list. Next, program the function that converts a property list to an association list.

Solution