[plt-scheme] Re: HtDP 12.4.2 question details

12.4 is not pivotal. You can move one and return whenever you feel  
like tackling it again.

However, 12.4 is a good test of whether

  (1) you have understood and absorbed the design recipe
  (2) you have understood and absorbed the idea of "making a wish"  
when you're stuck
  (3) you have the persistence to apply the design recipe over a  
series of four five six auxiliary functions.

It is particularly heavy on (3). (Once you understand that (1) and  
(2) give you (3), you will also see that the exercise takes 10-20  
minutes at most.)

-- Matthias





On Apr 7, 2009, at 12:10 AM, mike wrote:

> For the professors out there; I cruised through sec12 until i got
> to problem 12.4.2(spent hours and i just don't get it!!).I just want
> to move on but my question is : Is 12.4.2 a pivotal problem in gauging
> one's understanding of the design recipe??? Does failure to solve the
> problem indicate a serious flaw in understanding that will impede
> under-
> standing of subsequent sections of the book?
> mike
>
>
> On Apr 4, 10:03 pm, Grant Rettke <gret... at acm.org> wrote:
>> Thanks guys. I won't be abusing the function contract by keeping that
>> integer in there. I am back to work.
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