IWETHEY v. 0.3.0 | TODO
1,095 registered users | 0 active users | 0 LpH | Statistics
Login | Create New User
IWETHEY Banner

Welcome to IWETHEY!

IWETHEY Home / IWETHEY Board / Theory and Practice of Programming Forum / Please deconstruct it for me
Post #121,532
by broomberg
10/16/03 7:37:25 PM
Reply
New Please deconstruct it for me
I'm brain farting.
Post #121,534
by ben_tilly
10/16/03 7:56:38 PM
Reply
New Deconstructed
If you understand what this does:

echo {A,B}{A,B,C}{A,B}

then you shouldn't be surprised at

perl -e'print"$_\\n"for glob"{A,B}{A,B,C}{A,B}"'

The key is therefore how to produce that string. Well we do it as:

perl -e'print"$_\\n"for glob join"","{A,B}","{A,B,C}","{A,B}"'

Now we just need to produce those. Well our first trick is $" and array interpolation. If you set $" to ",", then a list interpolates into a string with comma separators. So with that global set, "@{[A..C]}" is "A,B,C". Slap braces around that, and you see what "{@{[A..$_]}}" does.

Now we just need to get the right list of characters. BCB=~/./g does that in list context, which we are in. (I didn't think of that trick at first. My initial versions in the revision history used split.)

And that's it.

Cheers,
Ben

PS You will note that I am making liberal use of unquoted barewords as strings. This wouldn't exactly pass strict, but I don't have that on so I don't care.
"good ideas and bad code build communities, the other three combinations do not"
- [link|http://archives.real-time.com/pipermail/cocoon-devel/2000-October/003023.html|Stefano Mazzocchi]
Post #121,692
by broomberg
10/17/03 1:55:58 PM
Reply
New Ahh
I'm religiously opposed to glob so it didn't click!
Maynow, as an internal, it is safe.
But I always got burned on "command line too long" from globs so I always
opendir, grep for what I want, close dir.
Post #121,694
by ben_tilly
10/17/03 2:01:30 PM
Reply
New Ditto, but I remember the stupid trick for golf
"good ideas and bad code build communities, the other three combinations do not"
- [link|http://archives.real-time.com/pipermail/cocoon-devel/2000-October/003023.html|Stefano Mazzocchi]
     Combinatron - (tablizer) - (39) - Oct. 15, 2003, 06:44:35 PM EDT
         Python example (using generators) - (admin) - (3) - Oct. 15, 2003, 07:25:59 PM EDT
             Nice language - reads as easy as pseudocode - (deSitter) - (2) - Oct. 15, 2003, 07:51:28 PM EDT
                 Post the code. -NT - (admin) - (1) - Oct. 15, 2003, 09:23:31 PM EDT
                     The idiom - (deSitter) - Oct. 16, 2003, 06:10:13 AM EDT
         OK, so the generators were nifty, but not needed :-) - (admin) - (34) - Oct. 15, 2003, 07:30:15 PM EDT
             Probably more efficient: - (admin) - (33) - Oct. 15, 2003, 07:34:53 PM EDT
                 And the readable version :P - (FuManChu) - (32) - Oct. 16, 2003, 12:12:40 AM EDT
                     Ick. Globals. - (admin) - (31) - Oct. 16, 2003, 11:12:49 AM EDT
                         Granted. - (FuManChu) - (30) - Oct. 16, 2003, 03:32:18 PM EDT
                             Like this? - (admin) - (29) - Oct. 16, 2003, 04:32:00 PM EDT
                                 This is probably worth decomposing, too - (admin) - Oct. 16, 2003, 05:02:10 PM EDT
                                 Now you've EARNED my nasty Perl tricks... - (ben_tilly) - (25) - Oct. 16, 2003, 07:31:28 PM EDT
                                     Yabut... - (admin) - (20) - Oct. 16, 2003, 07:29:32 PM EDT
                                         Re: Yabut... - (deSitter) - (1) - Oct. 16, 2003, 07:56:41 PM EDT
                                             Appearances *are* complexity - (FuManChu) - Oct. 16, 2003, 08:00:38 PM EDT
                                         They can? - (ben_tilly) - (17) - Oct. 16, 2003, 07:58:47 PM EDT
                                             Ruby? (Perl was impressive, knock me out dude) -NT - (deSitter) - (15) - Oct. 16, 2003, 08:04:07 PM EDT
                                                 Sorry, I am rusty enough not to attempt it - (ben_tilly) - Oct. 16, 2003, 08:11:02 PM EDT
                                                 Two Ruby Versions - (JimWeirich) - (13) - Oct. 17, 2003, 05:23:19 PM EDT
                                                     Recursive + stack space... - (admin) - (10) - Oct. 17, 2003, 05:30:56 PM EDT
                                                         Re: Recursive + stack space... - (JimWeirich) - (7) - Oct. 17, 2003, 06:31:32 PM EDT
                                                             Ah, ok. - (admin) - (6) - Oct. 18, 2003, 01:15:01 PM EDT
                                                                 Proof by induction - (deSitter) - (5) - Oct. 18, 2003, 01:28:31 PM EDT
                                                                     ... - (admin) - (4) - Oct. 18, 2003, 01:32:39 PM EDT
                                                                         (sheepish grimace) - (deSitter) - Oct. 18, 2003, 01:49:38 PM EDT
                                                                         Recursion and Lisp - (JimWeirich) - (2) - Oct. 18, 2003, 02:51:28 PM EDT
                                                                             You still misunderstand me. - (admin) - (1) - Oct. 18, 2003, 03:31:03 PM EDT
                                                                                 Re: You still misunderstand me. - (deSitter) - Oct. 18, 2003, 08:05:14 PM EDT
                                                         Only other people's... :) - (FuManChu) - (1) - Oct. 18, 2003, 05:34:05 PM EDT
                                                             No, I should go look that one up. -NT - (admin) - Oct. 18, 2003, 09:20:21 PM EDT
                                                     Let me golf the one-liner a little... - (ben_tilly) - (1) - Oct. 17, 2003, 06:18:01 PM EDT
                                                         Ooo ... Good call on split - (JimWeirich) - Oct. 17, 2003, 06:48:44 PM EDT
                                             Wrong interpretation. - (admin) - Oct. 16, 2003, 08:26:45 PM EDT
                                     Please deconstruct it for me - (broomberg) - (3) - Oct. 16, 2003, 07:37:25 PM EDT
                                         Deconstructed - (ben_tilly) - (2) - Oct. 16, 2003, 07:56:38 PM EDT
                                             Ahh - (broomberg) - (1) - Oct. 17, 2003, 01:55:58 PM EDT
                                                 Ditto, but I remember the stupid trick for golf -NT - (ben_tilly) - Oct. 17, 2003, 02:01:30 PM EDT
                                 Mein Gott. - (FuManChu) - (1) - Oct. 16, 2003, 07:56:33 PM EDT
                                     Yep. It's a great language. -NT - (admin) - Oct. 16, 2003, 08:28:10 PM EDT

I don't like those orange potatoes like that.
60 ms