# Eww, those bytes are gross

Write a program or function that, when given a string, filters out as many distinct bytes as it can and returns the cleaned string. However, since your program hates them, none of these bytes can be present in your own code.

Your score will be the number of distinct bytes your program filters out from the input, with the higher the better. This is a max score of 255 (since your program has to be a minimum of one byte). The tiebreaker is the length of your code, with lower being better.

For example, if your program filters out the bytes 0123456789, it receives a score of 10, but your program itself cannot contain these bytes.

### Rules

• Bytes mean octets.
• You also have the option to take input as a list of integers, with values ranging from 0 to 255. These correspond to the equivalent bytes.
• Your output should be in the same form as your input
• Your code must be non-empty
• Yes, I know there's going to be a Lenguage/Unary answer. But at least golf it please? ;)

Edit Rule:

• You may choose to ignore a byte, for example if it is indistinguishable from the terminating byte for a string or for EOF. However, this means you can't use it in your submission, nor does it count for your score. If you choose to do so, your max score will be 254, but you don't have to handle that byte being in your input.
• Is it OK if the function doesn't work if the string contains null bytes (\0)? As C uses null terminated strings, a function cannot know whether it's the end of the string or just a null byte. – wastl Feb 25 at 15:18
• "Bytes mean octal bytes." Do you mean Octets? Octal is a way of writing numbers, three bits at a time so it doesn't always line up with byte boundaries. – Kevin Feb 26 at 0:31
• seems to be just begging for an answer in brainfuck – Jasen Feb 26 at 5:41
• @cmaster For people who cannot see deleted posts: There are a couple of brainfuck attempts, both failing because they cannot distinguish a NUL byte from EOF. – Ørjan Johansen Mar 5 at 1:11
• @ØrjanJohansen I've added a rule that can let you ignore a byte (for EOF purposes). This shouldn't be too abusable, since it also decreases your max score, and it makes the question more inclusive. – Jo King Mar 5 at 5:06

# Japt-P, score: 255 (2 bytes)

ff


f => filter, second f => everything but 'f'

Try it online!

# Japt, score: 255 (2 bytes)

From @Shaggy

oo


o => remove everything but, second o => 'o'

Try it online!

• The right language for the job :) – Kevin Cruijssen Feb 25 at 12:06
• oo would also work, without the -P flag. – Shaggy Feb 25 at 12:15
• Guys, we have a winner! – Adám Feb 25 at 12:52
• This is now the most upvoted Japt solution on the site. – Shaggy Mar 11 at 17:08

# Python 2, score 249, 1732 bytes

c="%c%%c%%%%c%%%%%%%%c"
ex=c==c
ee=c==""
exec"e=%x%%x"%ex%ex
exec"e%%%%%%%%=%x%%x%%%%x"%ee%ex%ee
exec"ee=%x%%x"%e%ee
exec"ee%%%%=%x%%x"%ex%e
exec"e=%x%%x"%ee%e
exec"ec=ex%cex"%e
exec"xe=ec%cec"%e
exec"xx=xe%cxe"%e
exec"xc=xx%cxx"%e
exec"ce=xc%cxc"%e
exec"cc=ce%cce"%e
exec"eee=xx%cec"%e
exec"cee=ce%cec"%e
exec"exe=ce%cex%%cxe"%e%e
exec"xxe=ce%cxx"%e
exec"cxe=ce%cex%%cxx"%e%e
exec"ece=ce%cec%%cxe%%%%cxx"%e%e%e
exec"xce=ce%cex%%cxe%%%%cxx%%%%%%%%cxc"%e%e%e%e
exec"cce=cc%cex%%cce"%e%e
exec"eex=cc%cex%%cec%%%%cce"%e%e%e
exec"xex=cc%cex%%cxe%%%%cce"%e%e%e
exec"cex=cc%cec%%cxe%%%%cce"%e%e%e
exec"exx=cc%cxx%%cce"%e%e
exec"xxx=cc%cex%%cxx%%%%cce"%e%e%e
exec"cxx=cc%cec%%cxx%%%%cce"%e%e%e
exec"ecx=cc%cxe%%cxx%%%%cce"%e%e%e
exec"xcx=cc%cec%%cxe%%%%cxx%%%%%%%%cce"%e%e%e%e
exec"ccx=cc%cex%%cec%%%%cxe%%%%%%%%cxx%%%%%%%%%%%%%%%%cce"%e%e%e%e%e
exec"eec=cc%cxc%%cce"%e%e
exec"xec=cc%cec%%cxc%%%%cce"%e%e%e
exec"cec=cc%cex%%cec%%%%cxc%%%%%%%%cce"%e%e%e%e
exec"exc=cc%cxe%%cxc%%%%cce"%e%e%e
exec"xxc=cc%cex%%cxe%%%%cxc%%%%%%%%cce"%e%e%e%e
exec"cxc=cc%cec%%cxe%%%%cxc%%%%%%%%cce"%e%e%e%e
exec"ecc=cc%cxx%%cxc%%%%cce"%e%e%e
exec"""x=""
"""
exec"x%c=c%%xex%%ecc%%xex%%eex"%e
exec"x%c=c%%cee%%cee%%ece%%cxx"%e
exec"x%c=c%%ccx%%xxx%%xcx%%xxe"%e
exec"x%c=c%%eex%%exx%%xec%%xxe"%e
exec"x%c=c%%xex%%cxc%%cce%%ecx"%e
exec"x%c=c%%xxe%%eex%%cxe%%cxe"%e
exec"x%c=c%%cex%%ccx%%xec%%ce"%e
exec"x%c=c%%eex%%ce%%xxx%%xcx"%e
exec"x%c=c%%ce%%eex%%ecc%%ece"%e
exec"x%c=c%%cec%%eec%%ecx%%xxx"%e
exec"x%c=c%%exc%%xxe%%cxe%%cxe"%e
cx="""eec
xec
xxx
xcx
exc
cee
cee
ece
cxx
ccx
xxx
xcx
xxe
xex
ce
cex
ccx
xec
ce
xex
ce
xxx
xcx
ce
xxx
xcx
eec
xxc
exc
xxe
cxe
xxx
cex
ce
xex
ce
xxx
xcx
cee
cee
cee
eee
xex
ecc
xex
eex
cee
xce
exe
cee
cee
cee
cxe"""
exec"exec%cx"%ce


Try it online!

Removes everything but exc%=" and newlines. The code generation is xsot's. I doubt it's optimized, so there are lots of bytes to save here!

## Haskell, score 249 250, 1088 335 bytes

(!:)((=:):(!=))=(((!):(!):(!):(!):(!):(!):(!):(!):(!):(!):(:):(!):(!):(!):(!):(!):(!):(!):(!):(!):(!):(!):(!):(!):(!):(!):(!):(!):(!):(!):(!):(!):(!):(:):(!):(!):(!):(!):(!):(!):(:):(:):(!):(!):(!):(!):(!):(!):(!):(!):(!):(!):(!):(!):(!):(!):(!):(!):(:):(!):(!):(:):(=!))!!(=:))(=:)((!:)(!=))
(!:)(=:)=(=:)
(=:)!(!=)=(!=)
(=!)=(!):(=!)


Defines a function !: that takes a list of integers and filters out all except 10,33,40,41,58,61, the ASCII-codes of \n ! ( ) : =.

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How it works: First let's rename the functions and parameters to sane names:

f (x:xs) = (listOfFunctions !! x) x (f xs)                   -- (!:)
f x = x

listOfFunctions = d:d:d:d:d:d:d:d:d:k:d:d ... : infiniteDs   -- inlined
infiniteDs = d : infiniteDs                                  -- (=!)

k      = (:)                                                 -- inlined
d x xs = xs                                                  -- (!)


The main idea is to have a list of two different functions (listOfFunctions), one to keep an element (k) and one to drop it (d). The list is indexed by the current element from the input list (x) and the function it picks determines whether to keep or drop the element. At index 0 we have d, because we want to drop 0s, the first k is at index 10, because we want to keep 10s (newlines). Both k and d take two parameters: x and the result of a recursive call with the rest of the list (xs). k prepends x to the recursice call and d just returns the recursive call.

The literal list of functions ends at index 61 (char =, the last k in the list) and is followed by an infinite number of d. This not only saves many explicit d, but also prevents us from having to end a finite list with [] which would require additional chars.

Edit: thanks to @Ørjan Johansen for +1 score and -753 bytes.

• By putting functions in the list instead of Bools you can get rid of | for score 250, 335 bytes. Also defined a synonym for repeat (!) to shorten the list (drastically, since | was far larger than the second largest excluded character. – Ørjan Johansen Feb 26 at 2:33
• Come to think of it, a function to abbreviate some of those long (!): sequences would probably also help. – Ørjan Johansen Feb 26 at 19:11
• @ØrjanJohansen: yes, but a sublist must be finite, so you need a way to construct the empty list only with !():=. Extracting [] from an existing list, e.g. the input list, won't work because it has type [Int], but we need [a->[a]->[a]]. – nimi Feb 26 at 19:47
• Could you please explain how it works? ! is curry snd, and =! is a infinite list of these, but that's all I can understand from this. – Michail Feb 26 at 21:39
• @nimi I meant a function in addition to (=!), something like (!=)(=:)=(!):(!):(!):(!):(!):(=:) or (more high-level, can be passed ((!):) or a section of itself) (!)!=(=:)=(!)((!)((!)((!)(=:)))). Lots of options to tweak. Number of repetitions, what kind of second (or even third) argument if any, and even if it's more optimal for compression to use \n or ; (block lengths 10 22 6 16 2 vs. 33 6 16 1). – Ørjan Johansen Feb 27 at 1:59

# JavaScript (ES6), score: 242 (142 bytes)

A rather naive approach using an array of bytes for I/O.

t=>t.filter(t=>'f'>'fffffffffffffffffffffffffffffffffffffffeeeffffeffffffffffffffeeffffffffffffffffffffffffffffefefffffffeeffeffefffffefe'[t])


Try it online!

### How?

The 14 characters that are not filtered are '().=>[]efilrt. They are marked with an e in the lookup string. For characters above t (ASCII code 116) which are not defined in this string, 'f'>undefined is false.

• I was hoping one of these would be exactly 144 bytes long. This deserves extra credit for being one gross solution. – Jeff Bowman Feb 26 at 5:32
• The description says "when given a string"... – Yair Rand Feb 26 at 6:45
• @YairRand And it also says "you also have the option to take input as a list of integers". – Arnauld Feb 26 at 11:51
• I think this solution is backwards - it sounds like ideally the only characters that should be output are the characters actually used in the code, while everything else is filtered out. The good news is that this solution can be quickly adopted to work that way, while shaving two bytes off: t=>t.filter(t=>'f'>'fffffffffffffffffffffffffffffffffffffffeeeffffeffffffffffffffeeffffffffffffffffffffffffffffefefffffffeeffeffefffffefe'[t]). Here's a TIO test statement: console.log(f([...Array(256).keys()]).map(c => String.fromCharCode(c))) – Scott Hamper Mar 2 at 1:58
• @Arnauld I think you've scared off all the other decent JS contestants with your speedy supergolfs... – user77406 Mar 5 at 6:30

# APL (Dyalog Unicode), score: 253, tiebreaker: 8 bytesSBCS

Anonymous tacit prefix function

∩∘'∩∘'''


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∩ intersection of the argument

∘ and

'∩∘''' the three characters in the code (∩∘')

• This looks vaguely like an emoticon for someone angrily holding up four fingers. – Skyler Feb 26 at 20:04
• @Skyler Oh well. – Adám Feb 26 at 20:11

# POSIX shell, score 249, 18 bytes

tr -cd \\\\\ cdrt-


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Simple tr command that deletes all characters but -\cdrt and space. Four backslashes are needed because both the shell and the tr command use backslash escapes. The fifth backslash escapes the following space character.

If tr -cd was considered a programming language, one could write a single byte progam with score 255.

• It is, I think. It's got regular expressions, which are pretty powerful. – wizzwizz4 Feb 25 at 18:05
• @wizzwizz4 tr has character classes as used in regular expressions, but no full regular expressions themselves. – Digital Trauma Feb 25 at 22:57
• I don't understand what the backslashes are for, here. I think it would work fine without them? – David Conrad Feb 26 at 2:17
• @DavidConrad It does, but then it doesn’t preserve spaces. Then you need the 4 backslashes for a backslash. – wizzwizz4 Feb 26 at 7:11
• I shaved off a byte, at the expense of POSIX-complience, with tr -cd \ cdrt\\-\ Try it online! – wizzwizz4 Feb 26 at 7:12

# C (gcc), score 232235239241 242, 260407352249243 249 bytes

fn(int*f,int*i,int*n,int**t){if(f==i)if(*t=n){}if((f==i)==('+'=='*')){if((*f==',')+(*f=='\'')+(*f=='(')+(*f==')')+(*f=='*')+(*f=='+')+(*f=='=')+(*f=='\\')+(*f=='f')+(*f=='i')+(*f=='n')+(*f=='t')+(*f=='{')+(*f=='}'))if(*n++=*f){}if(fn(++f,i,n,t)){}}}


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A function taking a pointer to the beginning and end of an int array (where end is the first character not included), a pointer to a buffer and a pointer to another int pointer. It writes the result into the buffer and the end pointer of the result into the last pointer.

• In case it helps you, the challenge has been edited so that it is now permitted to ignore one particular byte value, say for NUL-terminated strings. It does reduce the score though. – Ørjan Johansen Mar 5 at 5:28

# Regex, Score: 255, 2 bytes

\\


Matches the character \.

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• Which regex flavor is it? To my understanding this only matches the first char, but not all within the input. – nimi Feb 27 at 16:19
• @nimi Well, my link uses .NET, and there is no global flag for .NET regexes. – Embodiment of Ignorance Feb 27 at 16:36

# Jelly, score 254 (4 bytes)

f⁾f⁾


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⁾xy is shorthand for “xy” (a two-character string).

We filter the input string down to just the characters occurring in “f⁾”.

• Heh, I had an answer prepared with f⁾⁾f but decided to ask the question about taking Unicode strings before posting. – Jonathan Allan Feb 25 at 17:37

# Ruby -p, score 248 (8 unique bytes / 483 bytes)

eval""<<11+11+11+1+1+1<<11+11+11+11+11+11+11+11+1+1+1+1+1+1+1<<11+11+11+11+1+1<<111+1+1+1+1+1<<111+1+1+1<<11+11+11<<11+11+11+1+1+1+1+1+1<<11+11+11+11+11+11+11+11+1+1+1+1+1+1<<11+11+11+11+11+11+11+11+11+1+1<<111+1+1+1+1+1+1+1<<11+11+11+11+11+11+11+11+1+1+1+1+1+1+1+1+1<<11+11+11+11+11+11+11+11+11+1+1+1+1+1+1+1+1+1<<11+11+11+11+1+1+1+1+1<<11+11+11+1<<11+11+11+1+1+1+1+1+1+1+1+1+1<<11+11+11+11+11+1+1+1+1+1<<11+11+11+1+1+1+1+1+1<<11+11+11+11<<11+11+11+1+1+1+1+1+1<<11+11+11+1+1+1+1+1+1


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• That is brilliant. :) – David Ljung Madison Feb 26 at 18:39

# Python 2, Score 244245 246, 13390 1575 bytes

Takes a list of integers

exec'%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c%c'%(111+1,111+1+1+1,11+11+11+11+11+11+11+11+11+1+1+1+1+1+1,11+11+11+11+11+11+11+11+11+1+1+1+1+1+1+1+1+1+1+1,111+1+1+1+1+1,11+11+11+11+11+11+11+11+1+1+1,111+1+1+1+1+1+1+1+1+1,11+11+1+1+1+1+1+1+1+1+1+1,11+11+11+11+11+11+11+11+11+1+1+1,11+11+11+11+11+11+11+11+11+11+1,111+1+1+1,11+11+1+1+1+1+1+1+1+1+1+1,111+1+1+1+1+1+1+1+1+1,11+11+1+1+1+1+1+1+1+1+1+1,11+11+11+11+11+11+11+11+11+1+1+1+1+1+1,11+11+11+11+11+11+11+11+11+1+1+1+1+1+1+1+1+1+1+1,11+11+1+1+1+1+1+1+1+1+1+1,11+11+11+11+11+11+11+11+11+1+1+1+1+1+1,11+11+11+11+11+11+11+11+11+1+1+1+1+1+1+1+1+1+1+1,111+1,111+1+1+1+1+1+1,111+1+1+1+1+1,11+11+11+1+1+1+1+1+1+1,11+11+11+1+1+1+1+1+1+1+1,11+11+11+11+11+11+11+11+11+1+1+1+1+1+1,11+11+11+11+11+11+11+11+11+1+1+1,11+11+1+1+1+1+1+1+1+1+1+1,111+1+1+1+1+1+1+1+1+1,11+11+1+1+1+1+1+1+1+1+1+1,11+11+11+11+11+11+11+11+11+1+1+1+1+1+1,11+11+11+11+11+11+11+11+11+1+1+1+1+1+1+1+1+1+1+1,11+11+1+1+1+1+1+1+1+1+1+1,11+11+11+11+11+11+11+11+11+1+1+1+1+1+1+1+1+1+1,11+11+11+11+11+11+11+11+1+1+1+1+1+1+1+1+1,111+1,11+11+11+1+1+1+1+1+1+1,11+11+11+11+11+11+11+11+11+11+1,111+1+1+1,11+11+11+11+11+11+11+11+11+1,11+11+11+1+1+1+1+1+1+1+1+1+1+1,11+11+11+1,11+11+11+11+11+11+11+11+11+1+1,111+1+1+1+1+1+1+1+1+1,11+11+11+11+11+11+11+11+1+1+1+1+1+1+1+1+1+1+1,11+11+11+1+1+1+1+1+1,11+11+11+1+1+1+1,11+11+11+1+1+1+1+1+1+1+1+1+1,11+11+11+1+1+1+1+1+1+1,11+11+11+1+1+1+1+1+1+1+1,11+11+11+11+1+1+1+1+1,11+11+11+1+1+1+1+1+1+1+1+1+1+1,11+11+11+1,11+11+11+1+1+1+1+1+1+1+1,11+11+11+11+11+11+11+11+1+1+1+1+1)


Try it online!

This evaluates to the following line of code:

print[x for x in input()if x in map(ord,"exc'%+()1,")]


# Japt, 249 score, 20 bytes

f"[ fq\"[\\\\\\]]" q


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• Luis managed to find the optimal solution but you could improve your score with oQ+"+oQ"Q or simply oo but that's just a variation on Luis' solution. – Shaggy Feb 25 at 12:18
• Haha, tbh I was rushing this one and ran out of time yesterday night, and imo any shorter and it's getting close to luis' solution :P – ASCII-only Feb 25 at 22:49

# Ruby -paF[^$_=F*'], score 250, 8 bytes $_=$F*''  I'm not sure at all this is legal under the current site rules for command-line flags, since the "flag" here is sort of passing in code that includes forbidden bytes. The F flag defines an input separator regex consisting of all characters not in the code proper. The code proper sets the output to the concatenation of all input records. # MATL, Score 252 t't''m)'m)  Try it online! Explanation (for input input) t % Duplicate input. % Stack: {'input', 'input'} 't''m)~' % Push the string t'm)~ % Stack: {'input', 'input', 't'm)~'} m % 'ismember' to filter % Stack: {'input', [0 0 0 0 1]} ) % Index into input. % Stack: {'t'} % Implicit display.  # PHP, score 234, 58 62 bytes <?=preg_replace("_[^\"$(),;<=?[\]^\_\\\\aceglnpr]_","",\$argn);


Run as pipe with -nF or try it online.

# Pyth, score 249, 16 bytes

sf/"f/\"Tzs\\"Tz


Filters out every character except f, s, T, z, ", /, and \

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## K, score 246, 23 bytes

{x@&~x in"\"~ in@&{x}"}

{..} is a lambda with arg x

read as 'returns x at where not x in string'

String contains \"~ in@&{x} (the ten bytes used in the program)

# sfk, score 239, 133 bytes

+xed -i -case ixixi x+x+x xexex xdxdx x-x-x xixix xcxcx xaxax xsxsx xbxbx xyxyx xtxtx x"x"x x$x$$x x$x$$x x\\x\\x "x x x" x[byte]xx


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Performs replacements on the input (written as [delim][from][delim][to][delim]) changing all characters used in the program to themselves, which removes the character positions from consideration for input to the final replacement x[byte]xx which maps all bytes to the empty string.

# JavaScript, score 250, 95573 59273 bytes

A lightly golfed JS solution that is then run through JSFuck's algorithm. A lot of bytes, but a good score.

Original:

a=t=>t.replace(/[^![\]+()]/g,'')


The JSFuck rendering is 59273 characters:

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• s=>s.replace(/[^![\]+()]/g,'') should work – ASCII-only Feb 27 at 1:34
• Yep, it did significantly. Good idea. I believe that no matter what though, it is going to be on the order of thousands of bytes. – tschwab Feb 27 at 1:51

# brainfuck, Score: 248, 162 bytes

,[>---[----------->--<]>-[>->->->-->------->-->-------[<<]>-]>--->-->->--->------------->->-----------[<]<<[->>>->->->->->->->-<<<<<<<<<<]>>>[>]>[[>]<[->-<]>.>],]


Try it online!

Usually I don't answer my own questions, but people seem to have read my profle page, especially where it says If someone comments on a question "I wish there was a brainfuck solution", I feel obliged to provide one.

The bytes filtered out are -<>[],. and ignores the NUL byte, since it is indistinguishable from EOF. This is a bit longer than usual, since I'm deliberately avoiding using + to get a slightly better score. Even so, I might be able to golf the number generation part to save a few bytes.

• Both the C and Lenguage submissions have already adapted pretty specifically to the need to distinguish NUL from EOF. Perhaps use a 16-bit BF with a different EOF convention? – Ørjan Johansen Mar 4 at 6:26

# Whitespace, score: 253 (3 distinct bytes used, 97 bytes in total)

[N
S S N
_Create_Label_LOOP][S S S N
_Push_0][S N
S _Duplicate_0][T   N
T   S _Read_STDIN_as_character][T   T   T   _Retrieve][S N
S _Duplicate_input][S S S T S S T   N
_Push_9][T  S S T   _Subtract][N
T   S S N
_If_0_Jump_to_Label_PRINT][S N
S _Duplicate_input][S S S T S T S N
_Push_10][T S S T   _Subtract][N
T   S S N
_If_0_Jump_to_Label_PRINT][S N
S _Duplicate_input][S S S T S S S S S N
_Push_32][T S S T   _Subtract][N
T   S S N
_If_0_Jump_to_Label_PRINT][N
S N
N
_Jump_to_Label_LOOP][N
S S S N
_Create_Label_PRINT][T  N
S S _Print_character][N
S N
N
_Jump_to_Label_LOOP]


Letters S (space), T (tab), and N (new-line) added as highlighting only.
[..._some_action] added as explanation only.

Try it online (with raw spaces, tabs and new-lines only). A nice bonus is that I can use this code to transform the highlighted code above to the raw Whitespace program (which I did in this TIO as example), for which I usually use Notepad++. :)

Explanation:

Pretty straight forward. Here the pseudo-code:

Loop indefinitely:
Character c = STDIN as character
if(c == SPACE or c == TAB or c == NEWLINE):
Print c as character
Go to the next iteration of the loop