Protocols and Records

Write a Clojure protocol, Change, with three functions, move, left, and right. The move function uses a parameter to specify the distance to move.

Define a record Robot which has three fields, x- and y-coordinates, and direction. Use symbol :e, :s, :w, and :n for the directions. Robot will implement the Change protocol. The move function will move the robot by the specified distance in its current direction. Of course in Clojure that means it returns a new Robot with the desired coordinates and direction. The left and right functions will return new robots with the direction changes appropriately.

Extend the Change protocol to the String class. The 'left' method will circularly rotate the string left by one position so an input of "apple" will output "pplea". Similarly for the 'right' method. The 'move' method will return a new string that has been moved circularly to the right by the number of positions specified by the distance.

Post the code and the tests to the course site.