![Esoteric Programming
• 普通の人 normal programmer
puts “Hello, world!”
• Esoteric Programmer
alias|send¥
;$stdin=GC | "%p?"%def#
FALSE.gets();(8 | 64).chr+232424.
to_s(25)+", "+%w|w ! | *"orlc". next<<012||
(c).Yusuke end;"oh, 2009" | "stegano-X."[0,4].reverse
d,be="whydoes","crypto";:make. | %.mains..tr'eams',be.delete(d)
• 参考: ゴルファー cf. code-golfer (14B)
#!../s/grb -eh
http://d.hatena.ne.jp/kurimura/20090929/1254257912
3](https://image.slidesharecdn.com/rubykaigi2010-endoh-100830083347-phpapp01/85/Ruby-Esoteric-Obfuscated-Ruby-Programming-3-320.jpg)
![Esoteric Programming Language (esolang)
• 読み書きしにくいように作られた言語
obfuscated, confusing and unreadable programming language
– esoteric: 難解な、深遠な、秘伝的な、奥義に達した
– ex) brainf**k +++++++++[>++++++++>++++++++++
+>+++++<<<]>.>++.+++++++..+++.
>-.------------.<++++++++.----
----.+++.------.--------.>+.
• 共通の特徴:奇妙な制約 Hello world in brainf**k
common feature: bizarre constraint
– 使える文字 bizarre kind of character used
– 使える命令 bizarre instruction set
– 命令順序や文字配置 bizarre execution order and placement
4](https://image.slidesharecdn.com/rubykaigi2010-endoh-100830083347-phpapp01/85/Ruby-Esoteric-Obfuscated-Ruby-Programming-4-320.jpg)
![Yamanote Quine
アスキーアートでプログラムを書く
How to write “shaped” Ruby program
1. 空白とバックスラッシュなしでプログラムを書く
write your program with no space and backslash
2. eval %w と ).join で囲む enclose it
((
3. 自由に整形できる eval %w(
you can shape it as you like
pu
ts
• 注: %w() は文字列配列のリテラル “H
NOTE: %w() is a literal for Array
i”
• %w(foo bar) = [“foo”, “bar”]
).join##
21](https://image.slidesharecdn.com/rubykaigi2010-endoh-100830083347-phpapp01/85/Ruby-Esoteric-Obfuscated-Ruby-Programming-21-320.jpg)
![15quzzle
Quine でパネル移動後の盤面が出てくる
This prints new board that space was moved to specified direction
eval$s=%w[b=0 x40e1359a76cb d8f2;i=(m=0.. 15).find{|i|1
>b&m=15<<4*i} ;t=m|n=m<<4*o =("AdABrBlBAu A"=~/(.)#{ARG
V*''}¥1/||04| |0)-4;(n<1||n >1<<64||[255< <12]&[t>>040|
|___________2 |__________15 |___________8 |__________13
|0,t>>16,t]!= [])?t=0:i+=o; ;s="eval$s=%% w[b=0x%016x"%
(b^=t.&b|m&b> >o*4)+$s.gsub (/(¥|_+¥d+)+/ ,'')[/;.*/]+"
]*''||0"<<92| |1;z=s=s.scan (/.{13}/);3.t imes{|j|s[(i|
|__________11 |__________12 |___________6 |___________7
|0)/4*8+i+j*4 ,0]=m=(z=32.c hr)*13};c=b;4 .times{puts((
0..3.times{pu ts((s.slice!( 0,4)*z).rstri p)}).map{j=c%
16;c/=16;;(0| |0)<(j)?"|"+j .to_s.rjust(1 2,"_"):m}*(z|
|__________10 |___________9 |___________5 |___________3
|0),z)};b==0x fedcba9876543 21&&("%b"%"1t
v7c1th0wylel7 3ba35knw3t".t o_i(36)).tr("
01",".#").sca n(/.{25}/){pu ts$&}]*''||0¥
|___________1 |__________14 |___________4
23](https://image.slidesharecdn.com/rubykaigi2010-endoh-100830083347-phpapp01/85/Ruby-Esoteric-Obfuscated-Ruby-Programming-23-320.jpg)
![Quine relay
# ruby
l=92.chr;eval s="s=s.dump[r=1..-
2].gsub(/("+l*4+"){4,}(?!¥")/){|t|'¥"+l*%d+¥"'%(t.size/2)};5.times{s=s.dump[r]};puts¥"#
python¥¥nprint(¥¥¥"# perl¥¥¥¥nprint(¥¥¥¥¥¥¥"# lua"+l*4+"nprint("+l*7+"¥"(* ocaml
*)"+l*8+"nprint_endline"+l*15+"¥"-- haskell"+l*16+"nimport Data.List;import Data.Bits;import
Data.Char;main=putStrLn("+l*31+"¥"/* C */"+l*32+"n#include<stdio.h>"+l*32+"nint
main(void){char*s[501]={"+l*31+"¥"++intercalate"+l*31+"¥","+l*31+"¥"(c(tail(init(show("+l*31+"¥
"/* Java */"+l*32+"npublic class QuineRelay{public static void
main(String[]a){String[]s={"+l*31+"¥"++intercalate"+l*31+"¥","+l*31+"¥"(c("+l*31+"¥"brainfuck"+
l*64+"n++++++++[>++++<-]+++++++++>>++++++++++"+l*31+"¥"++(concat(snd(mapAccumL h
2("+l*31+"¥"110"+l*31+"¥"++g(length )++"+l*31+"¥"22111211100111112021111102011112120012"+l*31+"
¥"++concatMap("+l*32+"c->let d=ord c in if
d<11then"+l*31+"¥"21002"+l*31+"¥"else"+l*31+"¥"111"+l*31+"¥"++g++"+l*31+"¥"22102"+l*31+"¥")s++"
+l*31+"¥"21002111010120211222211211101000120211021120221102111000110120211202"+l*31+"¥"))))))++
"+l*31+"¥","+l*63+"¥""+l*64+"n"+l*63+"¥"};int
i=0;for(;i<94;i++)System.out.print(s[i]);}}"+l*31+"¥")))))++"+l*31+"¥",0};int
i=0;for(;s[i];i++)printf("+l*63+"¥"%s"+l*63+"¥",s[i]);puts("+l*63+"¥""+l*63+"¥");return
0;}"+l*31+"¥");c s=map("+l*32+"s-
>"+l*31+"¥""+l*63+"¥""+l*31+"¥"++s++"+l*31+"¥""+l*63+"¥""+l*31+"¥")(unfoldr t s);t[]=Nothing;t
s=Just(splitAt(if length s>w&&s!!w=='"+l*31+"¥"'then 501else w)s);w=500;f 0=Nothing;f
x=Just((if x`mod`2>0then '0'else '1'),x`div`2);g x= reverse (unfoldr f x);h p c=let d=ord c-
48in(d,replicate(abs(p-d))(if d<p then '<'else '>')++"+l*31+"¥"."+l*31+"¥");s="+l*31+"¥"#
ruby"+l*32+"n"+l*31+"¥"++"+l*31+"¥"l=92.chr;eval
s=¥"+(z=l*31)+¥"¥¥¥"¥"+s+z+¥"¥¥¥""+l*31+"¥"++"+l*31+"¥""+l*32+"n"+l*31+"¥""+l*15+"¥""+l*7+"¥")"
+l*4+"n¥¥¥¥¥¥¥")¥¥¥")¥"########### (c) Yusuke Endoh, 2009 ###########¥n"
28](https://image.slidesharecdn.com/rubykaigi2010-endoh-100830083347-phpapp01/85/Ruby-Esoteric-Obfuscated-Ruby-Programming-28-320.jpg)
![対「文字配置制約」まとめ
summary of anti-shape constraints
• Ruby は文字配置制約＋Quine に滅法強い
Ruby beats shape constraints and Quine
– あやしい言語機能に感謝 thanks to weird language features
• %w, %q
• BEGIN
• eval
– 文字列整形も強い also useful methods for string shaping
• String#rjust, split, gsub!, slice!, rstrip
• to_i / to_s / Integer#[]
• unpack / pack / zlib
30](https://image.slidesharecdn.com/rubykaigi2010-endoh-100830083347-phpapp01/85/Ruby-Esoteric-Obfuscated-Ruby-Programming-30-320.jpg)
超絶技巧 Ruby プログラミング - Esoteric, Obfuscated Ruby Programming
- 1. 超絶技巧 Ruby Programming Esoteric, Obfuscated Ruby Programming 遠藤侑介 Yusuke Endoh
- 2. Who am I? • Yusuke Endoh 遠藤侑介 – twitter: @mametter – hatena: http://d.hatena.ne.jp/ku-ma-me/ in Japanese – blogger: http://mamememo.blogspot.com/ in English • A committer for Ruby and RubySpec – 1.9.2 assistant release manager • An esoteric programmer 2
- 3. Esoteric Programming • 普通の人 normal programmer puts “Hello, world!” • Esoteric Programmer alias|send¥ ;$stdin=GC | "%p?"%def# FALSE.gets();(8 | 64).chr+232424. to_s(25)+", "+%w|w ! | *"orlc". next<<012|| (c).Yusuke end;"oh, 2009" | "stegano-X."[0,4].reverse d,be="whydoes","crypto";:make. | %.mains..tr'eams',be.delete(d) • 参考: ゴルファー cf. code-golfer (14B) #!../s/grb -eh http://d.hatena.ne.jp/kurimura/20090929/1254257912 3
- 4. Esoteric Programming Language (esolang) • 読み書きしにくいように作られた言語 obfuscated, confusing and unreadable programming language – esoteric: 難解な、深遠な、秘伝的な、奥義に達した – ex) brainf**k +++++++++[>++++++++>++++++++++ +>+++++<<<]>.>++.+++++++..+++. >-.------------.<++++++++.---- ----.+++.------.--------.>+. • 共通の特徴:奇妙な制約 Hello world in brainf**k common feature: bizarre constraint – 使える文字 bizarre kind of character used – 使える命令 bizarre instruction set – 命令順序や文字配置 bizarre execution order and placement 4
- 5. Theme: Enjoy esolang with Ruby! • 制約を課せば Ruby も esolang として楽しめる Ruby with constraint can be an esolang – 1. 使用文字制約に勝つ （ ○○文字だけで Ruby を書けるか？） beat “character constraints” (Can you write Ruby with __ character-only?) – 2. 文字配置制約に勝つ （アスキーアート Quine） beat “shape constraints” (ASCII-art Quine) • 見所 Highlights • ゲーデル数 Gödel numbering – むだに深淵な背景理論 • コルモゴロフ複雑性 Kolmogorov complexity esoteric theory • チューリング完全性 Turing completeness – 勝つためなら何でもする • Ruby の黒魔術 Ruby’s black magic • コードゴルフ code golf dirty hack • 文法や意味論の悪用 abuse of syntax/semantics 5
- 6. 1. Hello world with __ Character- only 6
- 7. Hello world with Number only require "1234567890" 316805813369061470447252554255354 816767578747985092956934801232229 450578663292118901228453190669621 8369564670777459615871118090530 任意のプログラムが書けます you can write not only “Hello, world!” but also any program 7
- 8. Hello world with number only 実装 internal • ゲーデル数化 Encoding: Gödel numbering • Ruby の黒魔術 Ruby’s black magic • you can install: gem install 1234567890_ 8
- 9. Hello world with number only ゲーデル数による符号化 Gödel numbering 9
- 10. Hello world with number only 黒魔術 Ruby’s black magic • コードに書かれただけの数字の参照を引っぱり出す How to gain number written in code directly – GC.disable – at_exit – ObjectSpace.each_object(Bignum) – eval 1.8 と 1.9 両方で動く both 1.8 and 1.9 can run this JRuby でも動く（が –X+O オプションが必要） JRuby can also run this, but needs -X+O option; uncool 10
- 11. Hello, world with underscore only require "_" ____ _ _____ ____ __ ____ ____ __ ___ ____ __ __ _ ______ _____ ___ _ _ ___ _____ ______ ____ _ _ ____ _ _ ____ _ ____ __ __ ___ _ ______ ___ ____ __ ______ ____ _ ____ ____ __ _ ____ _ _ ___ _____ _____ _ ______ ____ _ ______ _____ 11
- 12. Hello world with underscore only 実装 internal • プログラムのゲーデル数化 （“number only” と同じ） also uses Gödel numbering • ゲーデル数の 6 進数表記をアンダースコアで表す represent each base-6 digit of Gödel number as length of underscores • Ruby の有名黒魔術: method_missing Ruby’s famous black magic: method_missing • you can install: gem install _ 12
- 13. Hello world with underscore only なぜ 6 進数？why base-6? 13
- 14. class String def inspect concat begin dup ensure replace String nil concat concat concat concat size concat concat size concat concat size concat size concat begin size ensure replace String nil end end Hello world with purely Alphabet only concat begin dup ensure replace String nil concat concat concat concat concat concat size concat size concat begin size ensure replace String nil end end concat begin dup ensure replace String nil concat concat size concat concat concat concat size concat concat concat size concat begin size ensure replace String nil end end concat begin dup ensure replace String nil concat concat size concat concat concat size concat concat size class String concat concat concat begin concat concat dup ensure replace String concat concat size concat begin size ensure replace String nil end end concat nil size size concat concat concat concat size def inspect concat concat concat concat begin concat dup ensure replace String concat concat concat size concat begin size ensure replace String nil end end nil size size concat concat size concat begin dup ensure replace String nil concat concat concat concat concat size size size concat begin size ensure replace String nil end end concat begin dup ensure replace String nil concat concat size concat concat concat concat size concat concat concat concat concat concat concat concat concat concat size size size size size concat begin size ensure replace String nil end end concat concat size concat begin dup ensure replace String concat concat concat concat concat concat size nil concat begin size ensure replace String nil end end concat concat begin dup ensure replace String concat concat nil size concat concat size concat concat size concat concat concat begin concat concat dup ensure replace String concat concat concat size concat begin size ensure replace String nil end end concat nil size size concat concat size concat size concat concat concat concat begin concat concat dup ensure replace String size size size concat begin size ensure replace String nil end end nil concat concat size concat begin size ensure replace String nil end end concat concat concat concat concat concat concat concat size size size concat begin size ensure replace String nil end end concat begin dup ensure replace String nil concat concat size concat begin dup ensure replace String nil concat concat concat concat concat concat concat concat size size size concat begin size ensure replace String nil end end concat begin dup ensure replace String nil concat concat size concat concat concat concat concat concat size concat concat concat concat concat concat concat concat size size size concat begin size ensure replace String nil end end concat begin dup ensure replace String nil concat concat concat concat size concat size concat concat concat concat concat concat dup ensure replace String concat concat concat concat size concat begin size ensure replace String nil end end concat begin nil size size concat concat size concat begin size ensure replace String nil end end concat begin dup ensure replace String concat concat concat concat concat concat size size concat begin size ensure replace String nil end end concat nil concat begin size ensure replace String nil end end concat begin dup ensure replace String nil concat concat size • require がない concat concat size concat concat concat concat size concat concat size concat size concat begin size ensure replace String nil end end concat begin dup ensure replace String nil concat concat size concat concat size there is no “require” concat concat concat size concat concat concat size concat begin size ensure replace String nil end end concat begin dup ensure replace String nil concat concat size concat concat size concat concat concat size concat concat concat size concat size concat begin size ensure replace String nil end end concat begin dup ensure replace String nil concat concat size concat concat size concat concat concat concat concat size exit end 14 concat begin size ensure replace String nil end end eval self end copyright MMX Yusuke Endoh p String nil
- 15. Hello world with purely alphabet only 実装 internal • 自分で読んでください no time to explain; please read code by yourself – http://d.hatena.ne.jp/ku-ma-me/20100709/p1 – You can read it because it is purely written in Ruby that you know! • shinh さんのアイデアがベース based on shinh’s idea (Shin’ichiro Hamaji) – アルファベットと数字だけ Pure Ruby with Alphabet and Number only – http://d.hatena.ne.jp/shinichiro_h/20081109#1226217059 15
- 16. 対「文字制約」まとめ summary of anti-character constraints • Ruby は使用文字制約に結構強い Ruby beats character constraints • おまけ: 1.8 と 1.9 は意外に互換である 1.9 is more compatible with 1.8 than you think • 未解決問題 open problem – 小文字アルファベットだけ lower-case alphabet only – 大文字だけ（不可能？） upper-case only (impossible?) – 「記号だけ」は解決済み FYI: “punctuation only” was resolved http://www.kurimura.com/rsencode/ 16
- 17. 2. Ruby for Quine in ASCII-art 17
- 18. Quine とは What’s Quine? • 自分自身を出力するプログラム a program that outputs itself eval s="puts'eval s='+s.inspect" • 実装の基本 implementation basis – 手順 1. 自分自身を文字列として再構成する Step 1. construct a string that is itself – 手順 2. その文字列を出力する Step 2. print it • 出力前に整形すると変な Quine ができる we can write “artistic” Quine by shaping it before printing 18
- 19. 山手Quine Yamanote Quine • 実行すると隣の駅名になる This program transforms the next station name of Japanese Yamanote Loop Rail line • 29 駅で元に戻る we need invoke ruby 29 times (stations) once – 起動速度重要 invoking speed matters – JRuby is 10x slower than MRI (3.3sec vs. 33sec) 19
- 20. Yamanote Quine 実装 internal 1. 自分自身を再構成する Step 1. construct a string that is itself 2. 次の駅の形に整形してから出力する Step 2. print it after shaping it as the next station name 3. 以上をアスキーアートの形で行う Step 3. write the program in ascii art – フォントデータ（圧縮） font data (compessed) – 駅名（圧縮） station names (compessed) – 圧縮の展開 decompressing – Quine – 整形 shaping – ゴミ padding 20
- 21. Yamanote Quine アスキーアートでプログラムを書く How to write “shaped” Ruby program 1. 空白とバックスラッシュなしでプログラムを書く write your program with no space and backslash 2. eval %w と ).join で囲む enclose it (( 3. 自由に整形できる eval %w( you can shape it as you like pu ts • 注: %w() は文字列配列のリテラル “H NOTE: %w() is a literal for Array i” • %w(foo bar) = [“foo”, “bar”] ).join## 21
- 22. Yamanote Quine 圧縮 compression • データサイズとデコーダサイズのトレードオフ trade off between compressed data size and its decoder size デコーダ小 shorter decoder データ小 shorter data データ大 longer data デコーダ大 longer decoder • 最適な圧縮方法はデータの規模によって変わる best decoder depends on data size data size (about) decoder ～ 10 bytes No compression • コルモゴロフ複雑性とか feel Kolmogorov complexity ～ 100 bytes String#to_i(36) – see Wikipedia ～ 500 bytes Base64 More Zlib + pack 22
- 23. 15quzzle Quine でパネル移動後の盤面が出てくる This prints new board that space was moved to specified direction eval$s=%w[b=0 x40e1359a76cb d8f2;i=(m=0.. 15).find{|i|1 >b&m=15<<4*i} ;t=m|n=m<<4*o =("AdABrBlBAu A"=~/(.)#{ARG V*''}¥1/||04| |0)-4;(n<1||n >1<<64||[255< <12]&[t>>040| |___________2 |__________15 |___________8 |__________13 |0,t>>16,t]!= [])?t=0:i+=o; ;s="eval$s=%% w[b=0x%016x"% (b^=t.&b|m&b> >o*4)+$s.gsub (/(¥|_+¥d+)+/ ,'')[/;.*/]+" ]*''||0"<<92| |1;z=s=s.scan (/.{13}/);3.t imes{|j|s[(i| |__________11 |__________12 |___________6 |___________7 |0)/4*8+i+j*4 ,0]=m=(z=32.c hr)*13};c=b;4 .times{puts(( 0..3.times{pu ts((s.slice!( 0,4)*z).rstri p)}).map{j=c% 16;c/=16;;(0| |0)<(j)?"|"+j .to_s.rjust(1 2,"_"):m}*(z| |__________10 |___________9 |___________5 |___________3 |0),z)};b==0x fedcba9876543 21&&("%b"%"1t v7c1th0wylel7 3ba35knw3t".t o_i(36)).tr(" 01",".#").sca n(/.{25}/){pu ts$&}]*''||0¥ |___________1 |__________14 |___________4 23
- 24. tic-tac-toe (○×ゲーム） （たぶん）世界初、思考ルーチン組み込み対戦型 Quine (maybe) the world’s first Quine with embedded AI 24
- 25. Quine Reversi 思考ルーチン組み込み、勝たないと Quine してくれない Quine with embedded AI, it does Quine only when you win 25
- 26. Merry Quine-mas クリスマスソング演奏機能組み込み Quine Quine with wave composer (plays a song before printing itself) 26
- 27. qng と qif 画像自身を出力する画像 images that draws a program that prints the image itself png gif 27
- 28. Quine relay # ruby l=92.chr;eval s="s=s.dump[r=1..- 2].gsub(/("+l*4+"){4,}(?!¥")/){|t|'¥"+l*%d+¥"'%(t.size/2)};5.times{s=s.dump[r]};puts¥"# python¥¥nprint(¥¥¥"# perl¥¥¥¥nprint(¥¥¥¥¥¥¥"# lua"+l*4+"nprint("+l*7+"¥"(* ocaml *)"+l*8+"nprint_endline"+l*15+"¥"-- haskell"+l*16+"nimport Data.List;import Data.Bits;import Data.Char;main=putStrLn("+l*31+"¥"/* C */"+l*32+"n#include<stdio.h>"+l*32+"nint main(void){char*s[501]={"+l*31+"¥"++intercalate"+l*31+"¥","+l*31+"¥"(c(tail(init(show("+l*31+"¥ "/* Java */"+l*32+"npublic class QuineRelay{public static void main(String[]a){String[]s={"+l*31+"¥"++intercalate"+l*31+"¥","+l*31+"¥"(c("+l*31+"¥"brainfuck"+ l*64+"n++++++++[>++++<-]+++++++++>>++++++++++"+l*31+"¥"++(concat(snd(mapAccumL h 2("+l*31+"¥"110"+l*31+"¥"++g(length )++"+l*31+"¥"22111211100111112021111102011112120012"+l*31+" ¥"++concatMap("+l*32+"c->let d=ord c in if d<11then"+l*31+"¥"21002"+l*31+"¥"else"+l*31+"¥"111"+l*31+"¥"++g++"+l*31+"¥"22102"+l*31+"¥")s++" +l*31+"¥"21002111010120211222211211101000120211021120221102111000110120211202"+l*31+"¥"))))))++ "+l*31+"¥","+l*63+"¥""+l*64+"n"+l*63+"¥"};int i=0;for(;i<94;i++)System.out.print(s[i]);}}"+l*31+"¥")))))++"+l*31+"¥",0};int i=0;for(;s[i];i++)printf("+l*63+"¥"%s"+l*63+"¥",s[i]);puts("+l*63+"¥""+l*63+"¥");return 0;}"+l*31+"¥");c s=map("+l*32+"s- >"+l*31+"¥""+l*63+"¥""+l*31+"¥"++s++"+l*31+"¥""+l*63+"¥""+l*31+"¥")(unfoldr t s);t[]=Nothing;t s=Just(splitAt(if length s>w&&s!!w=='"+l*31+"¥"'then 501else w)s);w=500;f 0=Nothing;f x=Just((if x`mod`2>0then '0'else '1'),x`div`2);g x= reverse (unfoldr f x);h p c=let d=ord c- 48in(d,replicate(abs(p-d))(if d<p then '<'else '>')++"+l*31+"¥"."+l*31+"¥");s="+l*31+"¥"# ruby"+l*32+"n"+l*31+"¥"++"+l*31+"¥"l=92.chr;eval s=¥"+(z=l*31)+¥"¥¥¥"¥"+s+z+¥"¥¥¥""+l*31+"¥"++"+l*31+"¥""+l*32+"n"+l*31+"¥""+l*15+"¥""+l*7+"¥")" +l*4+"n¥¥¥¥¥¥¥")¥¥¥")¥"########### (c) Yusuke Endoh, 2009 ###########¥n" 28
- 29. Quine relay • このプログラムは、このプログラム自身を出力する Unlambda プログラム、を出力する Whitespace プログラ ム、を出力する brainfuck プログラム、を出力する Java プログラム、を出力する C プログラム、を出力する Haskell プログラム、を出力する OCaml プログラム、を出 力する Lua プログラム、を出力する Perl プログラム、を出 力する Python プログラム、を出力する Ruby プログラム、 です • This is a Ruby program that outputs a Python program that outputs a Perl program that outputs a Lua program that outputs a OCaml program that outputs a Haskell program that outputs a C program that outputs a Java program that outputs a brainfuck program that outputs a Whitespace program that outputs a Unlambda program that outputs the program itself. 29
- 30. 対「文字配置制約」まとめ summary of anti-shape constraints • Ruby は文字配置制約＋Quine に滅法強い Ruby beats shape constraints and Quine – あやしい言語機能に感謝 thanks to weird language features • %w, %q • BEGIN • eval – 文字列整形も強い also useful methods for string shaping • String#rjust, split, gsub!, slice!, rstrip • to_i / to_s / Integer#[] • unpack / pack / zlib 30
- 31. 結論 conclusion • Why don’t you enjoy esolang with Ruby? – むだに深淵な背景理論 esoteric theory – 勝つためなら何でもする dirty hack • 教訓 lessons – 1.8 と 1.9 は意外と互換 1.9 is more compatible with 1.8 than you think – 起動速度重要 invoking speed matters for esoteric programming; JRuby is too slow 31
- 32. 最後に aside • 来年 RubyKaigi 併設で IORCC やりたい I hope IORCC to be held in conjunction with the next RubyKaigi – International Obfuscated Ruby Code Contest __END__ 32
- 33. 実行に 5 分かかる Quine Quine that takes five minutes 33