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For challenges that involve the physical layout or physical manipulation of source-code.

2 votes

The reversible reverser

JavaScript, 62 * 1.25 = 78 i.split('').reverse().join('')//)''(nioj.)(esrever.)''(tilps.i Not too creative, but the best I could come up with. (assumes that the input is stored in variable i) I di …
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6 votes

Program that prints mirror images of it's own self

Ruby UPDATE: Check out my new answer, based on the same idea as this one! $, | e="s= open( $0).r ead.s pli | t ( 1 0 . ch r); | $ …
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3 votes

Program your favorite phrase

Golfscript, 53 This one was fun. {'1'-print}:puts;.'You; are; not; a; duck.'';'/\,=\1+ Phrase: "You are not a duck." (which is completely true; entropy 3.5110854081804286) Explanation: The stack …
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11 votes

Double-time is not double time

vim, 5 i1<esc>X<C-a> Without doubling: i1<esc> insert the literal text "1" X delete backwards - a no-op, since there's only one character <C-a> increment, giving 2 With doubling: ii1 …
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7 votes

Program that prints mirror images of it's own self

Ruby This one definitely took me a while. But it was really fun! # e= "/+ +d.f …
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4 votes

Write a function that tells you which TWO of its lines has been removed

JavaScript, 152 characters golfed function t() { var fa = (f + '').match(/\d/g) var ra = [] for (var i = 0; i < 5; i++) { if (fa.indexOf(i + '') < 0) ra.push(i + 1) } retu …
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17 votes

Beatles Songs and Hexagons

Snowman 1.0.2, width = 13 }?}///////////} ///"Get Back"//// /////////////////// ///////////////////// "Sun King//"[["Sun King "*"BirthdaysP/"*"Birthday "]]8AaLsP[[///"]]8AaLsP[[/ …
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8 votes

Self-Validating Triangular Checkerboard Program

C (gcc), 189 bytes j ;l ;b; d;f␉ (char ␉*␉t) {b=*␉t% 2;for␉(␉ j=d=0;j=j + 1,␉l=j+ 1,␉*␉t; ) { for␉(;l=l- 1 ;t=t+ 1 )b= !b␉,␉d=d+ !(␉* ␉t␉*␉(␉*␉t- 10) *␉(␉*␉t%2-b) ) ; d␉|=*␉t- 10;t=t+ 1 ; }b= !d …
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73 votes

What did we forget?

zsh, 603 594 566 561 548 440 415 399 378 370 bytes ec ho \\n;ca t<<<$'\x20';exi t d$c -e8BC6P d0c -eKp $'\172\163\150' $'\055\143' $'\146\157\162 v \151\156 \173\043\056\056\134\175\175\073\173 \14 …
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10 votes

Palindrome Hello, World

Macaroni 0.0.2, 52 bytes print "Greetings, Planet!""!tenalP ,sgniteerG" tnirp A solution that doesn't use comments. (Mostly because Macaroni doesn't have comments...)
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11 votes

A well linked challenge

Jelly, 20 bytes ĠẈḂẸẆṖÇ€Ạ ĠẈḂẸ ẆṖÇ€Ạ Try it online! The first line is ignored. It's only there to satisfy the condition that every character appear an even number of times. The next line first Ġr …
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