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<meepdeew>
Hello, does Racket not use the concept of dotted pairs for a cons cell containing two separate, non-empty items?
<meepdeew>
I'm chugging away through htdp and am on exercise 181, converting cons notation to use list notation, and I'm failing the following:
<meepdeew>
(check-expect (cons "a" (cons (cons 1 '()) (cons #false '()))) (list "a" (cons (list 1) (list #false))))
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<greghendershott>
meepdeew: I don't really know HtDP and its exercises, but: Maybe try evaluating each expression one by one -- working inside out, combining?
<greghendershott>
Like, hmm, what is (cons 1 '()) ? Then what is (cons #false '()) ?
<greghendershott>
Then what is (cons __ __) each of those results?
<greghendershott>
And upward.
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<meepdeew>
okee doke. Thanks, greghendershott. I'd confused myself with this: (cons 1 2) ;=> cons: second argument must be a list, but received 1 and 2
<greghendershott>
meepdeew: Oh I see. Yeah. That's not the "normal" `cons` from `#lang racket` (or as you'd know from other lisps). Are you using one of the "teaching" `#lang`s?
<meepdeew>
Yep, htdp calls it bsl, beginning student language.
<meepdeew>
Although going back through it, my failed test was simply a mistake on my part, nothing from requiring a list type - I'd simply talked myself into thinking it was.
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<ZombieChicken>
Anyone here used the irc lib? I'm trying to put together something but am having some problems debugging why a connection is apparently not working
<ZombieChicken>
iirc, there is an IRC bot written in it, but I don't recall the name of it to look it up on github
* profmakx
has used it
<profmakx>
and written an irc bot in it
<profmakx>
but I am not sure whether I'd be of great help ;)
<ZombieChicken>
well, I'm just trying to get connected atm
<ZombieChicken>
think I didn't pay enough attention to docs, so I'm having to look up how to wait for an event