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Perl: the Markov chain saw

Re: How's your Perl? (II)

by xmath (Hermit)
on Jul 22, 2004 at 14:14 UTC ( #376580=note: print w/replies, xml ) Need Help??

in reply to How's your Perl? (II)

Official hints:

[all]There are two "wildcard solutions" that each can be used to solve nearly all of the exercises. Due to the no-reuse rule you can use each of them only once, and they're officially used for exercises 3 and 13.
[1-5]Just explore all kind of scalar references. If you're really desperate you can plow through Perl_sv_2pv_flags() in sv.c in the perl source code to see exactly how references get stringified.
[3]Good candidate for wildcard one: Find a way to override the meaning of the regex.
[4,8]The pattern of exercise 4 is misleading, but the search down this incorrect path may reveal the solution to exercise 8. Exercise 4 is actually simpler than you'd think.
[5]A fairly recent and unknown class of built-in objects.
[6]Alias. (Last year there was a similar one which could be solved by manipulating $[. I tried to prevent that this year, though initially without success)
[7]Make modification fail.
[8]Find something that fails to get assigned anywhere. See also hint about 4 and 8 above. The ability to acquire this thing at all is most likely a bug.
[9]Subtly perturb the meaning of the regex.
[10]Have $foo change as a result of the first part of the predicate test.
[11]Find a way to scribble onto $| so rudely it never gets properly turned into 0 or 1. This mechanism is most likely a bug.
[12]Find a variable that ignores being assigned to. This behaviour is most likely a bug.
[13]The best spot for wildcard two: A feature was added in 5.8 with which you can modify constants.

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[1nickt]: Corion HPs? ugh. I was impressed with Lenovo's gaming laptops; if it weren't for the red backlighting and general flashiness of the aesthetic, I might have gone with that. But all that was until I discovered that the Dell Precision line is still around.
[1nickt]: stevieb I don;t doubt that there's a difference. BestBuy has "consumer" models only on display.
[ambrus]: 1nickt: for some reason, these days they call every computer "gaming", even ones that gamers wouldn't buy. I've bought a keyboard that was labelled "gamer", despite that it has hard springs and seems to be way better for typing than for gaming;
[1nickt]: I though the gamers like that because they bash the keys so hard.
[ambrus]: and I've seen motherboards with no fast expansion ports for a video card but built-in hardware RAID advertized as "gaming".
LanX has a shaming laptop
[ambrus]: 1nickt: my impression is that the gamers like the softer springs, because fast reaction time is more important to them then feedback from keypresses to recognize typos.
[1nickt]: Ah, I see. I did read some gamer mag reviews, and yes, they lamented the fact that laptops with no discrete video card are sold as "gaming" hardware.

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