Ruby TRICKS of 2018

Ruby was initially designed to be a successor of the Perl programming language, which also means that it inherited a lot of Perl's expressiveness. To celebrate this, the TRIC¹ contest was invented:

The best submissions were awarded at the Japanese Ruby Kaigi conference and also included in the Ruby source, for educational purpose. The winning submissions² of 2018 were:

¹ Transcendental Ruby Imbroglio Contest
² All code is MIT licensed, Copyright (c) 2018, TRICK Winners and Judges

1st Place (Gold): "Most reserved"

By kinaba (remarks)

alias BEGIN for unless def class super true or return defined? next break while begin undef do end rescue then retry else undef module nil ensure case if yield __LINE__ self and redo elsif not __FILE__ alias END in end when __ENCODING__ end until false end

The above Ruby program does not output anything, but it is 100% valid code. What is noteworthy: It only consists of reserved keywords and makes use of all of them!

2nd Place (Silver): "Best spiral"

By Yusuke Endoh (remarks)

'';eval(r=%q(->z{r="'';eval(r=\ %q(#{r}))[%q`#{z}`]";i=-040;30. times{|n|(15+n%2*15-n/2).times{ r<<r[i+=(1.-n&2)*(32-n%2*31)]}} i=r[524,0]=?\0;eval(r[479..-1]) c['"']}))[%q`GFEDCBA"+"[e\"'"'t kE*;;\";" TRICK2018 ";tb,;{{r 2E0$ob[us@*0)[90,336])_#i\n}s#i 0H}>["t]];};o[1,?\n*8];ex"-}eac 1Hl<1[-1]*2*t=n%2];o[14-n,0)mvk 8M$<4,?\n];15.times{|n|;o[35ie2 !Pss.slice!(0,1)+x;sleep(0.0t;0 'W=%q"<<95<<$s<<95;o=->n,x{n.'1 ;@[2]}|\e../,%@s="'%trick2018!8 eval$s=%q_eval($s.gsub!(/#{%@`]

Running the above code returns itself, it is a quine. And on top of that, instead of returning the result line by line, it prints itself using a spiral animation!

3rd Place (Bronze): "Best png viewer"

By Tomoya Ishida (remarks)

X=[];class String def-@;replace ?-+self end;def-a;X.reject!{|x|x. __id__==__id__};a.replace(self+?-+a) end end;at_exit{eval C=(Zlib .inflate((X*?-).tr(?-,'').tr('q-z','0-9').to_i(26).digits(0x100). pack'C*'))};def method_missing n;(X<<n.to_s)[-1]end;require'zlib' fzygtoxyzgntmdmuwvfoffbpmvzojpkhczvjvjdbtscnldwbdoprackddovivvmkz ponzmosvtjciwkgaslscxxxwudeesmmqpfhislxuxnnypulxstzgobyaekqqhbjcg mvko------------ddkeys----eivhnccaqyiw---bzyccmt-----------ymtnge jwhi--------------pjxf------mdarbtumnv---qasda--------------gmwdt wrtk---qtpzgnce----fsl-------fkgzgtbpp---gwnm----pxkpqkdiw---owga momz---yjjvpnvar---zeo---v-----duvalwu---nsqt---waofemwakivnyqkjd fzag---uhvusmkl----kzb---rhc----iutzjr---mqlh---ayijpwativpweaato xexs--------------rvgv---pjdz-----lkkg---uiaw---lovitupw-----fwmn kfru------------jvjpgv---jskycf----pal---gbuf---hfdnywog-----iuca pntn---apmkqroeuzwuwkw---gqnmgof-----b---hlpl---vkkyhfyrqfr--jwrl kmdb---dhspujhmtgrkccu---uonfummdt-------rqfw----bpiactehwp--fncq yzvz---gdaxebplhfndran---ytfmviryeh------hqwkl---------------nced bibu---fnkdthgldhkxxjg---rwnmpudhbqin----gucoyki------------hfura cqdgqpyzqfzknvdjoxxhpjulwwyebtocxdrvklbuviwwcatlmdosxfvwntzbijguy iglrvvzlxerflupxvsyujfacuwhrvmnecgtewtqkhtdggcltejiyqcluclkycwvzg vvxfysvttfbeglvrlngntdngzyhqrmltazwdydxrsvjploembhgxdvfmmhepbschm brn--iqrcdb--evv----tqp------lg--uein-wzut--mr------wkh------foqz zsf--srjnjp--ampb--pfio--hgtekx--rrr---fwd--jn--xqkezcz--vsb--nya khrc--evlr--oioxs--mqce--bqfmag--bwz---xda--qw--jnuzelr--qzi--itx mdxd--duso--wxbot--nmon--ugnbdpc--a--c--e--hlg--twxndre--tby--rhg evhbn--zb--dtxmiz--dpia------vie--h--i--t--shh------kfn------owna ealmt--kb--scxdjy--smvl--dqmgebk--t--s--t--gfd--updcbnc--rh--dwwp dvpnxb----wpljjdy--kolc--qflyleok---xkv---usbj--jhrawbn--ewx--bgf eaqwrw----ejwxhet--dice--eoczconm---urz---rqyp--hovvvfc--bskj--el aocjcts--jtumwxm----mgy------xpaoq-jtwqr-aipay------dhy--iync--hk sckddmvuvvuhhqstumaykvczaaujrumqbbqsdvdycplyrlkkojlxnkrhbbrmnjxyf cdtcmpfmjvthwkpzucbblttgumomlxnxwjeypfeagaukfzeokzxjebkpigcvlqnso

Requires gem install chunky_png. This program converts a PNG image into ASCII art! It will turn this image into the following text output:

undef p;X=[];class String def-@;replace ?-+dup end;def-a;X.reject!{|x|x.__id__==__id__};a.replace(self+?-+a) end end;at_exit{eval C= (Zlib.inflate (X*?-).tr(?-,'').tr('q-z','0-9').to_i(26).digits(256).pack'C*')};def method_missing n;(X<<n.to_s)[-1]end;require'zlib' gmlztzdculbtzgtjfetuh---k--htf----d-----------------------------------------------------g-b-----s--t-g--------jmuwescmgchftikfjafccs ivchcveidpvxdabnvwyga-f--v-------xf----------------------------------------------------q-v---l-------q---------liiNeawriayymwooxgxqw rfosepqsmojseyezmwbhi--------------ew--------------------------------------------------m---k-r-----------vwu--hiotltdmczwyjmlvbyfqwq uvvykqdjednoqgtcmtfbzs---------f----o--------------------------------------------------t--a------m----x---f-----dldzsakyofetfozfpmrq geusutariiiNiulkjbwlm-----d------------------------------------------------------------j---------o---------x--j-uitzrgwpupwhvendhyno uubvnssiywkklwwdufhhi-rw----k---v-------------------------------------------------------sty-----yg---l---c-v----wkffpskpumolqmkeryzg zrxdaiposwybbzgxdnegh-----g-----ma--n---------------------------------------------------------j----n--b-n-------yqavmscswdogpcgopygt axiqfswlhzeamvymdnteo---q-q-w--------------------------fhrmj-----------------hkou-----------f-----d----u-o------evcuxxegekfgivzzujan nslioftsvqvtkeigvfgwr-------------lyco-----------------igyvg-----------------okuk---------m--b-u--d--y------s---dadjrlykfhtermzfyktu btoxzfpPicxxfligbivvf--------h----yrat---------------------------------------vjwd---------------------d-ki--o--tyqosehopkwttigwwfskp komzvnyrvkjcjwbmdwdkp----------vxphiNdtawn--xms-saketo--jnld----ezulntdaz----nzna-----vhjwt------h----x--x--o--saxxsrkgktqotaluylbkk sclegratyaarmgmepheml----------hwgglhlrfcx--znvmpfsgjx-onhju---gtxsmzqprlt---mjzy---frhdk-------------v---mj----dzjujmbgldfwoybgicwu tfhgnhlzxlwtdtkgzlaca-------------gmex------arlm--------rvmh-ajtgf-----pqal--wcux-zatyi-------------------------xnluwybcugjclmablshn tnjohqtqzivgmyutrssil-------------lcwq------jrf--------gcaii-maie------------vvnfjfqwo--------------------------filivosyhkxcvuwdibwj tyxjiopiFqypvwdzoatuq-------------tdln------cnx---------ffuf-ajvq------------tyyypglpzmj------------------------vtqzwewqdsijrbymvpwn niNffphoehukpvvmzvhyd-------------ahqd------nfr---------jeqk--toap-----mxhyg-tedv---otrwy-----------------------mjxnrktackwxwiajdnuc kkxhuwbvibpvgvcampadi-------------ebmencqz--obf--------wfprz---qmrotkijiqv---ggfp-----hlzw----------------------kastwdpxiyftmypuxbtu xetudmwzpomktgnjkcsyc---------------fwpdx---xb----j-----se-k------tllakc-----gjoo-------we------mic---lktk------ubtnrxvrjzuqlrfrsnmf okdvfvcdbdqkckjialskk---------------------------v---u-------l----------------------------------z--q--qfg--------aaliNbxbjjpxebboneye kcbkjmdclwnfawtfnwkeq----------------------------------j---y-------------------------------a---jmbyo-sgef--gf---extljbozuoofgyvsilct xzoqmsqgzjxxpjqwkjkdd------------------------o--------m-------f---------------------------------n--de-ajz-rzv---fhnpbkrwdxoozpxeaxaf mbcwxuiqdwcmadheiykaa-----------------------q-f------l---i---------------------------------r----zf---k--y---fi--dcnycheytylcgnioauee yekiNacriqoevtdjerqbp----------------------------w---yy-----my----------------------------ko--mnbpskr--c-----j--ozyqpbfovhbhyoprzgqr czwtuopxkdbphocfawvbk--------------------------q-s----j--b---------------------------------hd-xsb----bfiNp--w---fmwuvfambdqvxtzldwmh xysnyrseydlkjcwfbsjnr-------------------------d-d-------------------------------------------f-enpss---qllpwr----almsdidvjwoigvldfqoa lrpbixjpofxocxlflscpo------------------------------q-fyu--z-------------------------------------kfd-z---n-------bqxurujnxzurrdgcojks jetyfdkcekckxbyosbfws-------------wdfhgwuvejjmf-----sxjubpvgcsl-------tnmixpv---------eurabjsdvstfv-------------qcyiqhonwoyixqeonfvp mopPhywsozohitutgmmrb------------zxwtxe--riedeo---mspgpnv--pimlh------jhtzajk--------qqovvq---ldbrh-------------xtooxpayonpcvvtmvpra vvuyiunpoeagdzqjecsub------------klrw------snrc---rrct------aajom--------nsyk--------peea-------azq-------------iNjefdkfhnagjicqwmsm mbwwbfgehhbdmvvlflmee---------------------hkejn---jtbo-------jdtje-------jcei---------afyz-----smtc-------------kksvfjyuaqtohxiohhlz dvfmfrzcmnsfruhqgjuxz------------------dfxdnlk----kkra-------xmmtf-------jwkw----------rdoozxtcho---------------bbwwferxwnnmdzcniicv mfneisdlyeqwynldjgonj----------------jgrjvc-------uxga-------ghnpr-------sers--------scbknx----gmjo-------------moedtnlbflhtlkjibrqk gobwqshnpbdcpjmjaeczr--------------iscsxs---------zfpo-------hhfwy-------qbba-------vhlxc-------ntod------------ndwzdomaptumzejiwqbn snucynymvfpnadyqkzfcv-------------ggze------------kuvfs-----zuhod--------mylo-------jhwyp-----z-pywd------------dqfmpnevmtqcikbrilto aotyxkipebdkassogpcbl-----------wgackesmvvsrihhd---orzndjndlzpb----------eobf-------kkayixzyotqfafa-w-----------mjjxoomwdglwvccozzut rthesuszfwycsqqrtxlot-----------ejcqlhriilqbtrys------lwbkzmvp-----------zzwm-------l--qijwfllndzb-ik-----------mmokqomjepdcotnsiNig nloryyoswwdmefywnnuhph------------------------------------------------------r--r-nd-----h--x--------------------hlgzeqqslwxgtjgghquf nssngjtiudsrvfuxjzclhjhj----------------------------------------------------------t----------------k-f-mp-------obhyehqebtpjbkeepqzt ezogzsimfynqmkteaipejo-g-yser-----------------------------------------------e------h-------------i---y----------qpgcqnltivmmsximbbsy wtjjolwyoselcumgklqwpldkl-ulm-m---------------------------------------------------------------q---u-f--l--------buixfiitufktsqdtnrei tgrtitcewseetlpeuuujb-osdokjozc------------------------------------------n---d-----f--------g--------q--g-------jyyqtezuzmcxgpcwuwfx dpPayqmzxrwhbswwalygfurtkruw-u-k---------------------------------------------d---h------i----------c----i-------ulowcddvjbxthqlxjzbe

Every piece of ASCII art generated also contains the full converter program and can be used to transform another PNG image into ASCII!

4th Place: "Best one-liner"

By Colin Fulton (remarks)

# (c) 2018 Colin Fulton. Available for use under the terms of the MIT License. $🚀=0;def 🤔 🏷,🤔=0,&b;puts ' '*$🚀+(🤔 ?"":"🚫 ")+🏷;$🚀+=4;b&.[];$🚀-=4;end

What we have here is essentially a testing framework in 68 characters! It uses a method named 🤔 as its API. To illustrate its usage, here is an example:

$🚀=0;def 🤔 🏷,🤔=0,&b;puts ' '*$🚀+(🤔 ?"":"🚫 ")+🏷;$🚀+=4;b&.[];$🚀-=4;end 🤔 "Math" do 🤔 "Addition" do 🤔 "One plus one equals two.", 1+1 == 2 🤔 "One plus one equals eleven. (This should fail.)", 1+1 == 11 end 🤔 "Subtraction" do 🤔 "One minus one equals zero.", 1-1 == 0 🤔 "Ten minus one equal nine.", 10-1 == 9 end end

Test output:

Math Addition One plus one equals two. 🚫 One plus one equals eleven. (This should fail.) Subtraction One minus one equals zero. Ten minus one equal nine.

5th Place: "Most three-dimensional"

By Tomoya Ishida (remarks)

 X=[];def self.method_missing n;n.to_s.chars;end l=[];def l.-a;X<<a=[nil,*a];a;end;def l.+a;self-a;end class Array;def-@;[]-self;end;def-a;replace [*self,nil,*a ]end;alias +@ -@;alias + -;end;def gen3d f;yield;b=['solid obj'];w, h=X[0].size,X.size;X<<[];a=->r,z,dr,dz{;r-=w/2.0;z*=2;r2,z2=r+dr,z+dz*2;if r>0||r2> 0;r=[0,r].max;r2=[0,r2].max;16.times{|i|m=Math;p=m::PI/8;;c,s=m.cos(t=i*p),m.sin(t) c2,s2=m.cos(t=(i+1)*p),m.sin(t);t-=p/2;[[0,1,2],[0,2,3]].map{|a|b.push [:facet,'n'+ + 'ormal',dz*m.cos(t),dz*m.sin(t),-dr]*' ','outer loop',a.map{|i|'v'+ ++ "ertex #{[[r*c,r*s,z],[r*c2,r*s2,z],[r2*c2,r2*s2,z2],[r2* +c, r2*s,z2]][i]*' '}"},:endloop,:endfacet}}end};(0...h). map{| y|w.times{|x|[X[y-1][x]||a[x,y,1,0],X[y+1][x]|| a[x+1,y+ 1,-1,0],X[ y][x-+1]||a[ x,y+1,0,-1],X[y ][x++1]||a[x+1,y, 0,1]]if X[y][x]}} s=[b,'end'+b[0]]* $/;File.write(f, s);X.replace( []);end gen3d 'wine_glass.stl' do l--ww------------------ww--l l--ww------------------ww--l l--ww++++++++++++++++++ww--l l--ww++++++++++++++++++ww--l l--ww++++++++++++++++++ww--l l--ww++++++++++++++++++ww--l l---ww++++++++++++++++ww---l l----www++++++++++++www----l l------www++++++++www------l l--------wwwwwwwwww--------l l-----------wwww-----------l l------------ww------------l l------------ww------------l l------------ww------------l l-----------wwww-----------l l---------wwwwwwww---------l l----wwwwwwwwwwwwwwwwww----l end

Running the above Ruby program will create an STL file with a 3D description of a wine glass, which you could actually print out using a 3D printer. You can find a preview of the result here. Changing the shape of the glass in the above code will also change the outputted 3D model!

6th Place: "Most reversible" eban award

By Yusuke Endoh (remarks)

a,b=:reverse,:itself;b=b a=b=:itself;b r||=->s,m=a{s.send(m)};a puts r[$<.sort_by(&r),b] ;r||=->s,m=a{s.send(m)}; a=b=:reverse;0 b,a=:reverse,:itself#

This program sorts the file given as an argument. The fun starts, when you apply it on the program itself, because it will generate the following, different program:

 a=b=:reverse;0 b,a=:reverse,:itself# ;r||=->s,m=a{s.send(m)}; puts r[$<.sort_by(&r),b] r||=->s,m=a{s.send(m)};a a,b=:reverse,:itself;b=b a=b=:itself;b

This generated program is also a sorting-program, but it sorts the given file by reverse order. The fun continues when you use the program to reverse-order itself! This is the result:

a=b=:itself;b a,b=:reverse,:itself;b=b r||=->s,m=a{s.send(m)};a puts r[$<.sort_by(&r),b] ;r||=->s,m=a{s.send(m)}; b,a=:reverse,:itself# a=b=:reverse;0

It is even another sorting program, this time it will sort any given file by their last characters on each line. It is a reverse-line sorter! But what if we want to sort by reversed lines in reverse order? No problem, just go one level further and apply the reverse-line sorter program to itself:

 b,a=:reverse,:itself# a=b=:reverse;0 ;r||=->s,m=a{s.send(m)}; puts r[$<.sort_by(&r),b] r||=->s,m=a{s.send(m)};a a=b=:itself;b a,b=:reverse,:itself;b=b

The fun ends, when you let this sorter sort itself (again!) which produces the original code:

a,b=:reverse,:itself;b=b a=b=:itself;b r||=->s,m=a{s.send(m)};a puts r[$<.sort_by(&r),b] ;r||=->s,m=a{s.send(m)}; a=b=:reverse;0 b,a=:reverse,:itself#

7th Place: "Best compiler"

By Colin Fulton (remarks)

$l||=__LINE__;eval q=%q[k =";eval q=%q"; # (c) 2018 Colin Fulton (MIT License) # ;n=([1]);f=->s{[0]*(s.size/40)};$c||=-17 $r=[*$r]+[[]]*(($l-$c)/18);$c=$l;(s=""); ;;m=->a,b{8+4*a[b]};$r[ -1]+=f[s]+n;s=%; ;;s&&$r[-1]=f[s]+$r[-1]||(z=44);z=$l=s=z (y=->{z=puts(z.map &:rstrip)})&&(s="")&& e=->a,b,c{(a+a)[b+c]+a[b-c]};$r||=$r*42; ;h=[1,*8..10];f=->a,l{a+[0] *(l-a.size)} (r||=->{f[$r.flat_map{|a|f[a,9]},81]})&& c=->a,d{h.map{|p|e[a,d,p]}.sum};!nil.!|| g=->a{d=-1;a. map{(m[a,d+=1])[c[a,d]]}}; ;x=->{"$l||=__LINE__"+k+91.chr+q+93.chr} b=->{x[].split(?\n).map{|s|s[$t]}}||!$$; (v=->i{g[r[]][i]>0?b[]: [" "*40]*18}) && w=->i{z ?z.zip(v[i]) .map(&:join):v[i]}; ;$t=/\S.{0,39}/;u=->i{z=w[i];i%9>7&&y[]} ;at_exit{b=b&&($z||81.times(&u)&&$z=1)}]

The above code snippet is meant as a building block to build a pattern for a Conway's Game of Life simulation! You have to take this literally and build up the pattern using the above code block! Executing the pattern with Ruby will generate the next generation. Here is the "glider" start pattern. Repeat the script multiple times to see it moving! (zoom out for the best viewing experience)

8th Place: "Most composable" shinh award, leonid award

By Tomoya Ishida (remarks)

 (B||=[])<<6;C||=[];C<<%w@0 if@; a=?;*2018;C<<%w@2 (e=ARGV[0]);e=File.read@; t=->(i,s){s&&a[i.to_i,s.size]=s};C<<%w@25 (e)if@; u=->{C.map{|i,s|t[i,s]};eval(a)};C<<%w@30 (/^\.+$@; at_exit{_,u=u,->{};_[]};C<<%w@37 /!~e&&File.exist?(@; C<<%w@55 e));d='[><+-,.]';i=32.chr;f=0..79;c=(0..7).m@; C<<%w@99 ap{|c|b=['C||=[];','a=?;*2018;','t=->(i,s){s@; C<<%w@143 &&a[i.to_i,s.size]=s};','u=->{C.map{|i,s|t[i,@; C<<%w@188 s]};eval(a)};','at_exit{_,u=u,->{};_[]};'];o=@; C<<%w@233 0;f.map{|f|j=(0..67).map{|r|r-=34;s=f-34;m,n=@; C<<%w@278 r.abs,s.abs;h=->x{m<25&&n<34&&(x<0||n>17)};q=@; C<<%w@323 ->x{n<x+34&&x<n&&n<34};[h[r],q[-r],q[r],n<11|@; C<<%w@368 |(m<17&&n<34),n<12,r**4*1.6+16*(s-25)**4<8*17@; C<<%w@413 **4||(s>37&&s>17-r&&4*s<173-r),r**4+16*(s-25)@; C<<%w@458 **4<8*17**4,h[-r]][c]};r,p=j.index(!!0),j.cou@; C<<%w@503 nt(!!0);next(i*68)if(!r);k=f==45?'(B||=[])<<'@; C<<%w@548 +c.to_s+?;:'';g=b[0];(k+=b.shift)if(g&&g.size@; C<<%w@593 <=p-k.size);l=p-k.size-o.to_s.size-9;s=64.chr@; C<<%w@638 ;if(l>0);k+=['C<<%w',s,o,i,a[o,l],s,?;]*'';o+@; C<<%w@683 =l;end;(i*r)+k+?;*([p-k.size,0].max)+i*(68-r-@; C<<%w@728 p)}};(e.chars-(e.chars-d.chars)).each_slice(8@; C<<%w@773 ){|l|puts(f.map{|y|l.map{|r|c[d.index(r)][y]}@; C<<%w@818 .*(i*17).rstrip});4.times{puts};};else;x,i=@; C<<%w@861 Hash.new{0},0;y=%(while(x[i]!=0);i+=1;i-=1;@; C<<%w@904 x[i]+=1;x[i]-=1;x[i]=($<.binmode.getc||0)@; C<<%w@945 .ord;$><<(x[i]&0xff).chr;end).split(?;)@; C<<%w@984 ;eval(B.map{|a|y[a]}*?;);end;;;;;;;;;@; C<<%w@1021 ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;@; C<<%w@1051 ;;;;;;;;;;;;;;;;;;@;

This is not just another brainfuck compiler. Not only does this piece of code convert a bf source file into an equivalent Ruby source file. It also formats the resulting Ruby code into huge letters representing the original bf code. As a bonus, the compiler gets embedded into the generated Ruby file and is used when it receives another file as a command-line argument. A demo of all the described features in this short video by the author!

9th Place: "Most (un)readable"

By Yutaka Hara

def method_missing(n);$*<<n.to_s.bytesize n[-1]=="!" and eval$*.map(&:chr).join;end ＊自己言及的なプログラム. これは「自己に言及」したQuineプログラムです. 動かすには普通に無引数で実行してください. MRIの最新の安定版で動作確認を行っています. ＊冒頭の2行が日本語プログラミングのDSLを提供します. Rubyはピリオドまでの部分がメソッド名であると解釈します. そのままではNoMethodErrorになります. それをmethod_missingを使って検知しメソッド名のbytesizeをASCIIコードとして文字にします. メソッド名が半角の！で終わる場合、記憶した文字たちをjoinしてevalします. これにより任意のRubyプログラムを日本語により記述することができます. このプログラムの場合はこのファイルをreadし出力するようになっています. ＊Note：文の長さは注意が必要. UTF_8の日本語は1文字が3bytes. 端数が丁度になるよう英語を入れる. 以上、自己言及的programでした!

The first two lines of this Ruby script enable a "Japanese programming" style. The characters before each . get converted to ASCII on the basis of their byte size. The embedded example program is $><<IO.read($0): The code reads itself to then output itself.

10th Place: "Best double meaning" matz award

By Tomoya Ishida (remarks)

def self.method_missing name, *args name.to_s end FizzMessage = Fizz() BuzzMessage = Buzz() def fizzbuzz_loop n=100 n = n.to_i return 0 if n == 0 (1..n).each do |i| puts fizzbuzz(i) end error = get_error_message puts error if error end def fizzbuzz n set_error 'wrong argument type' if n.nil? if n < 0 n = -n retval = fizzbuzz n return retval else if mod3(n) == 0 && mod5(n) == 0 FizzMessage + BuzzMessage elsif mod3(n) == 0 FizzMessage elsif mod5(n) == 0 BuzzMessage else int2string n end end end def int2string n if n < 0 n = -n tmp = int2string n return '-' + tmp end base = 10 charcode_offset = 0x30 n = n.to_i unless n.is_a? Integer chars = n.digits( base ).map do |n| (n + charcode_offset).chr end chars.reverse.join end def mod3 n if n < 0 n = -n tmp = mod3 n return -tmp end return +0 if n % 3 == 0 return +2 if n % 3 == 2 || n % 3 == -1 return +1 end def mod5 n if n < 0 n = -n tmp = mod5 n flip = -1 tmp * flip else n.modulo 5 end end def set_error msg if !msg msg = 'UnknownError' retval = set_error msg return retval end $ERROR = msg end def get_error_message $ERROR end eval 'n=100;fizzbuzz_loop(n)'

The program printed above is not the original submission, but it looks very similar to the real entry! When run, it will print out the well-known FizzBuzz sequence:

1 2 Fizz 4 Buzz Fizz 7 8 Fizz Buzz 11 Fizz 13 14 FizzBuzz …

However, the actual competition entry will print out:

1 2 Ruby 4 Trick Ruby 7 8 Ruby Trick 11 Ruby 13 14 RubyTrick …

The difference: A bunch of invisible Unicode characters sprinkled throughout the code, namely U+00AB (no-break space) and U+200B (zero width space), which drastically change how the code gets interpreted!

11th Place: "Most attractive" eto award

By Tomoya Ishida (remarks)

 p,i,u,f,v,q ,h,x=[], Math,->x{i.sin x},->x,y,z{ x*=1.2; r,a,m=(1 -y=y*1.4+0.15)/2+0.1,y+u[3*x+4*y+5*z*=1.2] /12,x* x+z*z; l,s,b= m**0.5,i.atan2(z,x),u[6*a]**2/36+((x*x+z*z)**0.5-r)** 2-(1- a* a)/2 /500;l-= (1-y )/8 *d= (u[ 2*s +3*3*t =1-y- l/2]* u[ 3* s-3*2 * t]) **2/( 1+i. exp( t *10- 9- 5.5 ));e =4*l /( 1+( 0.01+ (1-a=y-d* ( 1 -y) /8)** 2)**0.5 -a)*(1-a * a+((1- a*a)**2+ 0.01 )** 0.5 )** 0.5 ;(i.atan( (1-0.2*i. asin( 0.98* u[+ +5.0 * i. atan2(y= 3*y-3.4,x *=3)] ))*( (0.01+x*x+ y*y )** 0.5-0.1) +4*(0.01+z *z*4 )**0.5-1)* i.atan( a*a+e*e-1-10/(1+(40*m)**10+((a+1)*10)**10))-0.01)*b},%w& MMM## TTTQQBKPTVVpQAk5Y7*pgw43v7*pgaor<*"ggau]/~"gau];-~'ga;,,,.'MerryChristmas!&*'',->x ,y,z, s,m{if(m== 1);g=f [x+=s/2,y+=s/2,z+=s/2];a, b,c=f[x+d=0.01,y,z]-g,f[x,y+d,z]- g,f[x, y,z+d] -g; p<<[x,y,z,a/d=(a*a+b*b+c *c)**0.5,b/d,c/d];else;(r=0 ...n=[m,4].min).map{|i|r.map{ |j|a, b=[f[ x+k =s*i/n,y+l=s*j/n,z+s],f [x+k,y+l,z],f[ x,y+k,z+l],f[x+l,y,z+k],f[x+s,y+k,z+l],f[x+l,y++s, z+k]]. minmax;return 8. times { | i|q[x + s * i [0],y+s *i[1] ,z+s* i[2], s,m/2]}if a*b <0 && s/= 2 }} ; end}, 0,1 .. j=128 (0..7) .each{|i|q[i[ 0] -z= 1.0,i[1 ]-z ,i[2] -z,z,64] ; $><< v[2 *i+64 ,2]};;; sleep 1;loop{ r,s ,m, l,d, w=i.cos( h+=0.02 ),u[ h],i.cos( m= u[ 2.3 *h ]/5),u [++m], x.map {[7]*j}, x. map {[7] *j};;p. each{| x,y ,z,a,b, e| x, z=x *r +s*z,z *r-s* x;y,z =m*y+ l*z ,m *z -l*y;x, y=64* (x+ 1 ),64 *( 1- y ) ;x<j &&y< j&&z< d[x ][ y]&& (d[x][y] ,w [x][ y]=z ,( 8* (1 +( a*r+b+ e*s)/2) /2).floor)};32.times{|i|4.times{|x|w[((u[i**3]+u[h/4+i]/4)*j+x[0])%j][(h/2+u[i*i])%1*j+x[1]]=5}};f=[1,1] $><<27.chr+ ?[+f* ';'+?H+(0..63) .map{|y|x.map{|x| v[w[x-=1 ][2*y]*8+w[x][2*y+ 1]]}.join}*$/}

Run the code next Christmas for an animated terminal Christmas tree.

12th Place: "Minimum alternative of irb" mame award

By Jan Lelis (remarks), wait, me on that list? Sure, it's no mistake? Unbelievable!

eval %w?_="";_ _=binding;l oop( )do $>< <"> >\s "if $/> _;p uts "=> \s%p "%[ __.e val (_+ =get s||exit!) ,_=""];rescu e(Ex cep tio n); put s""+ "\e [31 m%p \e[ 0m"% [$! ,_= ""] if/ d\se |ee /!~ "#$!"end?*""

Run the code above to get a fully functional REPL with multi-line support:

>> 21 + 21 => 42 >> 42.succ => 43 >> def announce puts "TRICK 2018" end => :announce >> announce TRICK 2018

For a better usage experience, error messages get displayed in red:

>> 1/0 #<ZeroDivisionError: divided by 0>

13th Place: "Most warned" yhara award

By kinaba (remarks)

def STDOUT.write (s); syswrite s end if def $>.write; end s = Array.new(){}.map{|s|} s << (-"Trick").grapheme_clusters{} [0] # frozen_string_literal: Trick s << ("Ruby".unpack *"ao") [0] s << "#{10**2018 + 1e2018}" [0] s << "#{1>2>3 rescue $!.class.trust.class}"[0] s << "#{true; Kernel.public_class_method}" [0] s << ($ruby.object_id.coerce +2018) [0] result = puts s*""

This program of 10 lines does not output anything special, but as soon you run it with warnings enabled (ruby -w), each line generates two warnings (Ruby 2.5), one at compile-time, and another one at runtime!

kin.rb:1: warning: parentheses after method name is interpreted as an argument list, not a decomposed argument kin.rb:2: warning: mismatched indentations at 'end' with 'def' at 1 kin.rb:3: warning: shadowing outer local variable - s kin.rb:4: warning: `frozen_string_literal' is ignored after any tokens kin.rb:5: warning: `*' interpreted as argument prefix kin.rb:6: warning: Float 1e2018 out of range kin.rb:7: warning: comparison '>' after comparison kin.rb:8: warning: unused literal ignored kin.rb:9: warning: ambiguous first argument; put parentheses or a space even after `+' operator kin.rb:10: warning: assigned but unused variable - result kin.rb:1: warning: method redefined; discarding old write kin.rb:2: warning: previous definition of write was here kin.rb:3: warning: given block not used kin.rb:4: warning: passing a block to String#grapheme_clusters is deprecated kin.rb:4: warning: character class has duplicated range: /\X/ kin.rb:5: warning: unknown unpack directive 'o' in 'ao' kin.rb:6: warning: Bignum out of Float range kin.rb:7: warning: trust is deprecated and its behavior is same as untaint kin.rb:8: warning: public_class_method with no argument is just ignored kin.rb:9: warning: global variable `$ruby' not initialized kin.rb:10: warning: #<IO:<STDOUT>>.write is outdated interface which accepts just one argument TRICK2018

Honorable Mentions

Also See

More Idiosyncratic Ruby