Re: Dungeons and Dragons die roller (Golf)

[Grimy]

Straightforward 39 bytes (37 + 2 flags) solution :

#!perl -pl
/\d+\+/;$-+=rand$&for 1..$_;$_+=$'+$-

More complex 35 bytes solution :

#!perl -pl
s/d/q(+~~rand($')+d)x$`/e;$_=eval

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

[Anonymous Monk]

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?

[tybalt89]

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

[Anonymous Monk]

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
=?????