racket definitions video 3/4 --- define functions without design
Channel: Danny Heap
Date: 2012-07-30

Video from http://www.cdf.toronto.edu/~heap/racket_lectures.html on how to replace long, convoluted, sequences of instructions by a definition where a place-holder plays the role of your chameleon, or whatever.    See also

http://www.cdf.toronto.edu/~heap/Racket/definitions.html    and also
http://www.cdf.toronto.edu/~heap/racket_lectures.html