Ask HN: Alternative to Codecademy model?

Teaching code by deconstructing an existing app and going in reverse. Does that make sense?

It is somewhat like the difference in learning/teaching language that is described here: http://www.youtube.com/user/PimsleurApproach?v=u-ZCNIHYQ1M&feature=pyv&ad=10586951585&kw=pimsleur

What do you think?