deRpiFy tHe sTriNg! [closed]

Question

Closed. This question needs details or clarity. It is not currently accepting answers.

Want to improve this question? Add details and clarify the problem by editing this post.

Closed 7 years ago.

yOu wiLl bE giVen A sTriNg wHich cOnsiSts oF pRintAble asCii cHarActErs.

yOu iTeraTe tHrougH thE sTrIng tHen chAnge rAndOM(uNifoRm, 50% cHanCe uPPercAse) lEtteRs to uPPercAse aNd eVerytHing elSe tO lOwercAse.

tHat'S iT.

(sorry for the punctuation, it was for the concept of the question)

Readable version:

You will be given a string which consists of printable ASCII characters.

You iterate through the string and change random(uniform, 50% chance uppercase) letters to uppercase, and everything else to lowercase.

that's it.

exaMplEs

iNpuT => pOssiBle oUtPUt
Programming puzzles and Code Golf => pRogRaMMiNg pUzzlEs aNd coDe goLf
dErpity deRp derP => deRpiTy dErp DerP
CAAAPSLOOOCK => cAAapslOoocK
_#$^&^&* => _#$^&^&*

What does "randomly" mean exactly? Can there be two consecutive capital letters (your test cases don't have any such configurations)? I'd say this question is underspecified in its current state, but I'm not going to vote on it yet. Please specify these two things. — hyper-neutrino, Apr 7, 2017 at 16:02
you say printable ASCII, but your test cases only include alphabetic characters. Should the program be able to deal with non-alphabetic characters, or can we expect the input to be purely alphabetic? — MercyBeaucou, Apr 7, 2017 at 16:59
I think most of the existing answers also assume that the decision is independent for each letter, but that's nowhere in the question. At present I think it would technically be compatible with the spec to write something along the lines of (pseudocode) s=>rand()%2?s.upper():s.lower() — Peter Taylor, Apr 7, 2017 at 21:02

Community · Accepted Answer · 2020-06-17 09:04:33Z

10

C – 65 bytes

Pretty good for a mainstream language!

main(c){while((c=getchar())>0)putchar(isalpha(c)?c^rand()&32:c);}

Uses XOR to randomly flip the bit at 0x20 for each alphabetic character. Program assumes ASCII character set and that EOF < 0.

Sample run on its own source!

$ main < main.c
MaIN(c){WhILe((C=GETChAr())>0)pUtCHaR(iSALpha(C)?C^rANd()&32:C);}

Very derpy.

edited Jun 17, 2020 at 9:04

CommunityBot

1

answered Apr 7, 2017 at 16:49

user15259

1

\$\begingroup\$ "Pretty good for a mainstream language!" - C is often surprisingly good for golfing. \$\endgroup\$
– Steadybox
Apr 8, 2017 at 22:03

Add a comment |

Neil · Accepted Answer · 2017-04-07 17:24:36Z

7

JavaScript, 87 bytes

function(s){return s.replace(/./g,c=>Math.random()<.5?c.toLowerCase():c.toUpperCase())}

68 bytes in ES6:

f=
s=>s.replace(/./g,c=>c[`to${Math.random()<.5?`Low`:`Upp`}erCase`]())

<input oninput=o.textContent=f(this.value)><pre id=o>

answered Apr 7, 2017 at 17:24

Neil

170k12 gold badges72 silver badges275 bronze badges

\$\begingroup\$ the second code does work but the first one: Uncaught SyntaxError: Unexpected token ( \$\endgroup\$
– Chris Vilches
Apr 8, 2017 at 2:20
\$\begingroup\$ @FeloVilches You have to use it in an expression context for it to work, otherwise the engine tries to parse it as a function statement. \$\endgroup\$
– Neil
Apr 8, 2017 at 9:43
\$\begingroup\$ Can be shortened using ES6. \$\endgroup\$
– CalculatorFeline
Jul 10, 2017 at 18:00
\$\begingroup\$ @CalculatorFeline To 68 bytes, no doubt? \$\endgroup\$
– Neil
Jul 10, 2017 at 18:34

Add a comment |

Community · Accepted Answer · 2020-06-17 09:04:33Z

5

Jelly, 6 bytes

,ŒsXµ€

Try it online!

How?

Lower casing all chars of the input and then uppercasing each with 50% probability is the same as choosing one of the original char and the swapped-case char with equal probability...

,ŒsXµ€ - Main link: string s
    µ  - monadic chain separation
     € - for each char c in s
,      -     pair c with
 Œs    -     swapped case of c
   X   -     choose a random item from the list (of the two chars)
       - implicit print

edited Jun 17, 2020 at 9:04

CommunityBot

1

answered Apr 7, 2017 at 16:21

Jonathan Allan

106k7 gold badges63 silver badges275 bronze badges

\$\begingroup\$ Ohh. Clever interpretation of the challenge. \$\endgroup\$
– Matthew Roh
Apr 7, 2017 at 16:22
\$\begingroup\$ By the way: is this uniform? \$\endgroup\$
– Matthew Roh
Apr 7, 2017 at 16:25
\$\begingroup\$ @SIGSEGV If by "uniform" you mean each char has a 50% chance of being each case then yes - X is implemented using Python's random.choice, so when presented with a list of 2 chars will pick each with 50% probability - every char in the input produces such a list (non-alphabetic chars will be a list of 2 equal chars, but that does not matter if the interpretation of "uniform" above is correct). \$\endgroup\$
– Jonathan Allan
Apr 7, 2017 at 16:34
\$\begingroup\$ Here is an example of line feed separated lists from which one char of each would be chosen. \$\endgroup\$
– Jonathan Allan
Apr 7, 2017 at 16:38

Add a comment |

AdmBorkBork · Accepted Answer · 2017-04-07 20:02:43Z

PowerShell, 64 60 bytes

-join([char[]]"$args".ToLower()|%{"$_".ToUpper(),$_|random})

Try it online! (make sure that "disable output cache" is checked if you want random results)

Exact translation of the challenge. Takes the input string, ToLower()s it, converts it to a char array, loops through each character |%{...}, and randomly selects between either the existing character or the uppercase variant. Then -joins them all back together into a single string. This works because ToUpper and ToLower only affect alphabetical characters, leaving punctuation and the like unchanged.

(Dennis fixed the alias list on TIO so that Random isn't trying Linux random but correctly aliases to Get-Random as a PowerShell command, as it should. Thanks, Dennis!)

Suever · Accepted Answer · 2022-09-04 02:05:31Z

5

MATL, 13 12 bytes

"@ktXkhlZr&h

Try it at MATL Online

Explanation

        % Implicitly grab input as a string
"       % For each character...
  k     % Convert to lowercase
  tXk   % Make a copy and convert to uppercase
  h     % Horizontally concatenate these two characters
  lZr   % Randomly select one of them
  &h    % Horizontal concatenate the entire stack
        % Implicit end of for loop and implicit display

edited Sep 4, 2022 at 2:05

answered Apr 7, 2017 at 16:03

Suever

11.1k1 gold badge23 silver badges52 bronze badges

Add a comment |

ETHproductions · Accepted Answer · 2017-04-08 01:39:47Z

Japt, 10 bytes

®m"uv"gMq2

Try it online!

Explanation

So this is kind of a cheesy hack, but it works. In JavaScript you can do something like

x[`to${Math.random()<.5?"Upp":"Low"}erCase`]()

to randomly convert x to upper- or lowercase. In Japt, the equivalent functions are u for toUpperCase and v for toLowerCase. But in Japt there is no direct way to get a calculated property value (x[expression] in JavaScript).

One of my favorite features of Japt is that if you have a function which is composed of a single method call (e.g. mX{Xq}, or .m(X=>X.q()) in JS), you can leave out everything except the name of the method, e.g. mq. The compiler then turns this into a string which gets passed to the original method call (.m("q")), and the method turns this back into a function. So there's no difference between mq and m"q"; both produce the same output.

Now, where I was going with this: while we can't directly call a random method on a string, we can call m on that string with a random method name. So, for the explanation:

®m"uv"gMq2
®           // Replace each char in the input by this function:
 m          //   Replace each char in this char by this function:
      g     //     the char at index
       Mq2  //       random integer in [0,2)
  "uv"      //     in "uv".
            //   This randomly calls either .u() or .v() on the char.
            // Implicit: output result of last expression

@obarakon I think that was more recent. A quick search on GitHub says it was May 5 — ETHproductions, Jul 10, 2017 at 18:49

Jörg Hülsermann · Accepted Answer · 2017-05-05 15:17:13Z

4

PHP, 53 Bytes

for(;a&$c=$argn[$i++];)echo(lu[rand()&1].cfirst)($c);

edited May 5, 2017 at 15:17

answered Apr 7, 2017 at 16:38

Jörg Hülsermann

13.3k3 gold badges14 silver badges36 bronze badges

1

\$\begingroup\$ Nice trick w/ the strto.*.er. :) \$\endgroup\$
– Alex Howansky
Apr 7, 2017 at 18:46
1

\$\begingroup\$ Save a byte w/ rand()&1 \$\endgroup\$
– Alex Howansky
Apr 7, 2017 at 18:46
1

\$\begingroup\$ Save a bunch of bytes by using foreach(str_split($argv[1]as$c)... instead of array indexing. \$\endgroup\$
– Alex Howansky
Apr 7, 2017 at 18:48

Add a comment |

Dada · Accepted Answer · 2017-04-07 16:19:07Z

2

Perl 5, 26 bytes

25 bytes + -p flag.

s/./rand 2&1?uc$&:lc$&/ge

Try it online!

answered Apr 7, 2017 at 16:19

Dada

8,4731 gold badge16 silver badges43 bronze badges

Add a comment |

Brad Gilbert b2gills · Accepted Answer · 2017-04-07 16:25:33Z

2

Perl 6, 32 29 bytes

{[~] .comb.map:{(.lc,.uc).pick}}

Try it

{S:g/./{($/.uc,$/.lc).pick}/}

Try it

answered Apr 7, 2017 at 16:25

Brad Gilbert b2gills

13.2k1 gold badge18 silver badges33 bronze badges

Add a comment |

ovs · Accepted Answer · 2017-04-07 17:43:28Z

2

Python 2, 77 74 bytes

lambda s:"".join(map(choice,zip(s.upper(),s.lower())))
from random import*

Try it online!

edited Apr 7, 2017 at 17:43

answered Apr 7, 2017 at 17:37

ovs

59.3k3 gold badges47 silver badges158 bronze badges

Add a comment |

Oliver · Accepted Answer · 2017-07-10 17:56:25Z

2

Japt, 12 10 bytes

£M¬?Xv :Xu

Explanation:

£M¬?Xv :Xu
£             // Iterate through the input. X becomes the iterative item
 M¬           // Return a random number, 0 or 1
    ?         // If 1:
     Xv       //   X becomes lowercase
        :     // Else:
         Xu   //   X becomes uppercase

Try it online!

edited Jul 10, 2017 at 17:56

answered Apr 7, 2017 at 20:22

Oliver

7,8722 gold badges17 silver badges37 bronze badges

Add a comment |

Suever · Accepted Answer · 2022-09-04 02:20:20Z

2

MATL, 12 11 bytes

1 byte removed using Jonathan Allan's idea of directly changing case.

"@rEk?Yo]&h

Try at MATL online!

Explanation

"         % Implicit input. For each
  @       %   Push current char
  r       %   Random number uniformly distributed on (0,1)
  Ek      %   Duplicate, floor: gives 0 or 1 with the same probability
  ?       %   If nonzero
    Yo    %     Change case. Leaves non-letters unaffected
  ]       %   End
  &h      %   Horizontally concatenate evverything so far
          % Implicit end and display

edited Sep 4, 2022 at 2:20

Suever

11.1k1 gold badge23 silver badges52 bronze badges

answered Apr 7, 2017 at 17:13

Luis Mendo

104k9 gold badges133 silver badges370 bronze badges

Add a comment |

Emigna · Accepted Answer · 2017-04-07 16:04:02Z

1

05AB1E, 8 bytes

vyDš‚.RJ

Try it online!

Explanation

v          # for each char y in input
 yDš‚      # pair lower-case y with upper-case y
     .R    # pick one at random
       J   # join to string

answered Apr 7, 2017 at 16:04

Emigna

53k5 gold badges42 silver badges162 bronze badges

Add a comment |

fəˈnɛtɪk · Accepted Answer · 2017-04-07 16:09:34Z

1

JavaScript, 77 bytes

x=>x.toLowerCase().split``.map(y=>Math.random()*2|0?y:y.toUpperCase()).join``

Try it online!

answered Apr 7, 2017 at 16:09

fəˈnɛtɪk

4,2042 gold badges14 silver badges40 bronze badges

Add a comment |

Business Cat · Accepted Answer · 2017-04-07 16:15:38Z

1

CJam, 14 bytes

qel{2mr{eu}&}%

Try it online!

Explanation

q               e# Read the input
 el             e# Make it lowercase
   {            e# For each character in it
    2mr         e#  Randomly choose 0 or 1
       {eu}&    e#  If 1, make the character uppercase
            }%  e# (end of block)

answered Apr 7, 2017 at 16:15

Business Cat

9,1671 gold badge16 silver badges37 bronze badges

Add a comment |

isaacg · Accepted Answer · 2017-04-07 20:53:49Z

1

Pyth, 5 bytes

srLO2

Test suite

srLO2
srLO2Q    Variable introduction
  L  Q    Map over the input
 r        Set the case of each character to 
   O2     Random number from [0, 1]. 0 means lowercase, 1 means uppercase.
s         Concatenate

answered Apr 7, 2017 at 20:53

isaacg

42k5 gold badges71 silver badges213 bronze badges

Add a comment |

user55852user55852 · Accepted Answer · 2017-04-07 23:29:18Z

1

Befunge, 136 bytes

>~:0`!#@_:"@"`!#v_:"Z"`!#v_:"`"`!#v_:"z"`!#v_,
^,<    <        <                 <
 >?<                     <             -*84<
  >84*+^

Try it online!

There is a lot of whitespace that I think is possible to get rid of. Befunge doesn't have a way of figuring out what's a letter and what isn't, so this is what I'm doing on the first row.

answered Apr 7, 2017 at 23:29

user55852

\$\begingroup\$ This snippet is a faster way of checking if the top value of the stack is a letter - pushes a 0 if it is, and a 1 if it isn't. It's a lot shorter to "and" conditions together by multiplying them instead of using a bunch of if statements routing to the same place \$\endgroup\$
– MercyBeaucou
Apr 8, 2017 at 2:26
\$\begingroup\$ I don't understand how that works. When I run it, it always gives me a 0, and it doesn't accept any input. \$\endgroup\$
– user55852
Apr 9, 2017 at 4:04
\$\begingroup\$ Sorry, in that program you put the value in the first quotation marks. In retrospect, this is a really dumb way to do that. It should be pretty easy to change the first three characters to a ~ \$\endgroup\$
– MercyBeaucou
Apr 10, 2017 at 21:58

Add a comment |

ovs · Accepted Answer · 2017-04-07 19:15:58Z

0

Bash, 64 bytes

first try

a=$(shuf -e -n 13 {A..Z}|tr -d "\n");b=${a,,};tr $b $a <<<${1,,}

Try it online!

shuffles capital letters, takes first 13, removes newlines and saved to $a. $b holds $a to lowercase. input is set to lowercase by ${1,,} and passed as a heredoc to tr which replaces each ocurrence of $b by $a

This is somewhat non compeating because the same letter is always capitalized.

edited Apr 7, 2017 at 19:15

ovs

59.3k3 gold badges47 silver badges158 bronze badges

answered Apr 7, 2017 at 18:58

marcosm

1,1365 silver badges10 bronze badges

Add a comment |

cnorthfield · Accepted Answer · 2017-04-07 19:17:09Z

0

JavaScript + HTML, 115 bytes

<input oninput="this.value=this.value.toLowerCase().split('').map(v=>Math.random()<.5?v.toUpperCase():v).join('')">

answered Apr 7, 2017 at 19:17

cnorthfield

1815 bronze badges

Add a comment |

Community · Accepted Answer · 2017-04-13 12:39:09Z

0

Bash, 162 Bytes

a=$1
b=1
c="echo $a|head -c$b|tail -c1"
while(($b<=${#a}))
do
r=$[RANDOM%2]
if [ $r = 1 ]
then d=$(eval $c);echo -n ${d^}
else echo -n $(eval $c)
fi
b=$[b+1]
done

Pretty self explanatory. Takes input from command line arg, writes to stdout.

Run like derpifier.sh "Derp this"

Man, once I start applying the tips the code shrinks fast.

edited Apr 13, 2017 at 12:39

CommunityBot

1

answered Apr 7, 2017 at 19:18

Feldspar15523

2211 silver badge5 bronze badges

Add a comment |

Community · Accepted Answer · 2020-06-17 09:04:33Z

0

Swift - way too many bytes (176 167)

uppercased(),lowercased(),arc4random_uniform() really kill the score, besides for me having to add a function since Swift has no standard input method!

import Foundation
func g(x:String){var result="";for i in x.characters{let e=String(i);result+=(arc4random_uniform(2)>0 ?e.uppercased():e.lowercased())};print(result)}

Function with usage: print(g(x: "Your String Here"))

edited Jun 17, 2020 at 9:04

CommunityBot

1

answered Apr 7, 2017 at 18:09

Mr. Xcoder

42.4k9 gold badges79 silver badges214 bronze badges

Add a comment |

Stack Exchange Network

deRpiFy tHe sTriNg! [closed]

exaMplEs

21 Answers 21

C – 65 bytes

JavaScript, 87 bytes

Jelly, 6 bytes

How?

PowerShell, 64 60 bytes

MATL, 13 12 bytes

Japt, 10 bytes

Explanation

PHP, 53 Bytes

Perl 5, 26 bytes

Perl 6, 32 29 bytes

Python 2, 77 74 bytes

Japt, 12 10 bytes

Explanation:

MATL, 12 11 bytes

Explanation

05AB1E, 8 bytes

JavaScript, 77 bytes

CJam, 14 bytes

Pyth, 5 bytes

Befunge, 136 bytes

Bash, 64 bytes

JavaScript + HTML, 115 bytes

Swift - way too many bytes (176 167)

Not the answer you're looking for? Browse other questions tagged
code-golf
string
random
or ask your own question.

Linked

Hot Network Questions

deRpiFy tHe sTriNg! [closed]

exaMplEs

21 Answers 21

C – 65 bytes

JavaScript, 87 bytes

Jelly, 6 bytes

How?

PowerShell, 64 60 bytes

MATL, 13 12 bytes

Japt, 10 bytes

Explanation

PHP, 53 Bytes

Perl 5, 26 bytes

Perl 6, 32 29 bytes

Python 2, 77 74 bytes

Japt, 12 10 bytes

Explanation:

MATL, 12 11 bytes

Explanation

05AB1E, 8 bytes

JavaScript, 77 bytes

CJam, 14 bytes

Pyth, 5 bytes

Befunge, 136 bytes

Bash, 64 bytes

JavaScript + HTML, 115 bytes

Swift - way too many bytes (176 167)

Not the answer you're looking for? Browse other questions tagged code-golfstringrandom or ask your own question.

Linked

Related

Hot Network Questions

Not the answer you're looking for? Browse other questions tagged
code-golf
string
random
or ask your own question.