http://qs1969.pair.com?node_id=1174699


in reply to Dungeons and Dragons die roller (Golf)

Straightforward 39 bytes (37 + 2 flags) solution : 
#!perl -pl
/\d+\+/;$-+=rand$&for 1..$_;$_+=$'+$-

[download]
More complex 35 bytes solution : 
#!perl -pl
s/d/q(+~~rand($')+d)x$`/e;$_=eval

[download]
Due to the use of $', they can’t easily be ran from the command-line. Just store them in a file.

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Re^2: Dungeons and Dragons die roller (Golf)
by Anonymous Monk on Nov 04, 2016 at 18:51 UTC
    After staring at this for a while, I'm not sure how exactly this works (mainly, what does +~~ do?). Would it be possible to explain how the 35 bytes solution works?
[reply]

      ~~rand($') is the same as int(rand($'))

[reply]
        I may be missing something very obvious, but could someone step through this one step at a time? The way I'm reading it, something like the below happens, and it doesn't make much sense to me. 
        Input: 2d4+10
Code: s/d/q(+~~rand($')+d)x$`/e;

2d4+10
2(q(+~~rand($')+d)x$`)4+10
2(q(+int(rand($'))+d)x$`)4+10
2(q(+int(rand(4+10))+d)x2)4+10
2('+int(rand(4+10))+d'x2)4+10
2('+int(rand(4+10))+d''+int(rand(4+10))+d')4+10
=?????

        [download]
[reply]
[d/l]

In Section Obfuscated Code