lisp - HTDP Exercise 6.6.1 - What does it mean by template functions? -


I'm looking at a plan for a little fun using the book "How To Make Fun Programs". All very easy yet, but ran into this weird words, where I am not clear what the purpose is:

Develop the template fun-round-circle, which resolves the function Which uses the circle. The result is undefined.

One possibility is that I am being asked to define a higher order function, but it seems that the lambda has not been fit in the form of the book so far And that you were following the book as a novice developer if you had to jump before running.

The second option will be to simply look for a function in just a comment, however, exercise 6.6.2 does not fit with the following instructions to use it:

Use fun-of-circle to develop a Draw-One circle

I'm sure something is clear to me, but I'm not sure what happened. Unfortunately I can not see the answer to see what I intend because I do not have a password, does anyone get any insight?

, a template is a type of sketch of a function, which Basically lists all the things that you know about input, along with the fields and often the result of a recursive call on the part of the data (these come later in the book). You can see the word defined with an example of the template.

BTW, the idea of ​​writing these templates clearly is central to the HDD approach, especially when it comes to later recursive functions - where you have a good analysis of data, then you can see almost random definitions Makes writing easy.


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