Ninety-Nine Lisp Problems

http://www.ic.unicamp.br/~meidanis/courses/mc336/2006s2/funcional/L-99_Ninety-Nine_Lisp_Problems.html

by parenthesis • 18 years ago

25 10 18 years ago

ic.unicamp.br

lsb• 18 years ago

But a malloc ain't one.

jsmcgd• 18 years ago

List me!

cujo2• 18 years ago

I looked at the first solution and my reaction is something along the lines of "what????".

Why not just something simple like.. (defun foo(thing) (list (nth (1- (length thing)) thing))

Same applies for problem 2.

felideon2• 18 years ago

And for number #5 you don't even need to write a function. Why not just use reverse? And notice his indentation and closing of parens is all wrong (i.e. not Lisp style). He's writing Lisp code thinking in a another language[1].

It's still a good exercise to go through them all as a Lisp newb like myself when I'm bored or need a break.

[1] Programming language, not Portuguese. :)

zitterbewegung• 18 years ago

Well using reverse sort of misses the point. You are supposed to implement reverse.

ehedberg• 18 years ago

Or even (defun last(thing) (car (reverse thing)))

vikram• 18 years ago

I think you don't really want to use length. Since it is a program evaluating last it might not be that bad as you have to goto the last element anyway.

Here is mine:

(defun our-last (list) (if (rest list) (our-last (rest list)) list))

hsmyers• 18 years ago

Given the context(first two problems), what is a 'box'?

Ninety-Nine Lisp Problems

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