รับสตริงคุณต้องแบ่งมันออกเป็นกลุ่มของอักขระสามตัว (โดยการเติม_ที่ท้าย)

ที่เกี่ยวข้องแต่ก็ยังแตกต่างกัน

ตัวอย่าง I / O:

• 'abcde' -> 'abc', 'de_'

• '1234' -> '123', '4__'

• '' -> [] or falsey value

• 'Three spree!' -> 'Thr', 'ee ', 'spr', 'ee!'

• สตริง 6 MB

นี่คือรหัสกอล์ฟดังนั้นไบต์ที่น้อยที่สุดจึงจะชนะ!

แก้ไข:ในที่สุดการส่งออกคือไม่ จำกัด

05AB1E , 9 8 ไบต์

…___«3ô¨

ลองออนไลน์! หรือเป็นชุดทดสอบ

คำอธิบาย

…___«      # append "___" to input
     3ô    # split into groups of 3
       ¨   # discard the last group

Python 3, 58 47 34 ไบต์

ฉันแน่ใจว่าคนอื่นทำได้ดีกว่าคนอื่นทำได้ดีกว่า ขอบคุณ Jo King สำหรับ-11 -24 ไบต์!

การส่งออกไม่ จำกัด ยินดีต้อนรับสู่ tuple นรก ส่งคืนรายการว่าง ( falsy ) จากอินพุตว่าง

lambda x:[*zip(*[iter(x+"__")]*3)]

TIO

JavaScript ขนาด 25 ไบต์

s=>`${s}__`.match(/.../g)

ลองมัน

Perl 5 , 16 15 ไบต์

"@_\__"=~/.../g

ลองออนไลน์!

APL + ชนะ36 24 22 ไบต์

บันทึก 12 ไบต์เนื่องจากผลลัพธ์ถูกยกเลิกการ จำกัด และใช้รหัสในความคิดเห็นแรกของ @ Adámที่แก้ไขเพื่อให้ทำงานใน APL + WIN และอีก 2 ด้วยความคิดเห็นที่สองของเขา ขอบคุณ

(⌈(↑⍴s)÷3)3⍴(s←⎕),'__'

Prompts for input of the string and outputs the result as a nx3 array

Try it online! Courtesy of Dyalog Classic

JavaScript, 51 50 48 27 25

b=>(b+"__").match(/.../g)

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Perl 6, 19 bytes

{$_~"__"~~m:g/.../}

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Pads the string by two underscores then splits the string into chunks of three characters. Returns as an array of Match objects.

Japt, 8 bytes

+1 byte to special case the empty string. Can save 2 if we can choose our padding character.

©ò3 ú'_3

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©ò3 ú'_3     :Implicit input of string
©            :Logical AND with
 ò3          :Split into chunks of 3
    ú'_3     :Right pad each with "_" to length 3

Stax, 7 bytes

é☻εgP▀╪

Run and debug it

For an empty string input, the result is an empty array, which is a falsey value in stax.

CJam, 11 bytes

q'_3*+3/);p

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For empty input this gives an empty string, which is falsy.

How it works

q     e# Read input as a string
'_    e# Push char '_'
3*    e# String formed by that char repeated 3 times
+     e# Concatenate to input string
3/    e# Split in groups of 3, the last of which may be shorter. Gives array of strings
);    e# Detach last string from the array and delete it
p     e# Print string representation of the array

Retina 0.8.2, 10 bytes

$
__
!`...

Try it online! Link includes test cases. Explanation:

$
__

Append two _s, in case the last group needs to be padded.

!`...

Match as many groups of three as possible, outputting the matches themselves rather than the count. (In Retina 1 this would be L instead of !.)

C (gcc), 67 bytes

i;f(char*_){for(;*_;puts(""))for(i=3;i--;)putchar(*_?*_++:95);_=0;}

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Always returns a falsey value (0).

Wolfram Language (Mathematica), 28 21 bytes

-7: No longer requires falsy (False) value on empty input

Partition[#,3,1,1,_]&

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Takes a list of characters as input. Returns a list of 3-tuples of characters padded with Blanks (_).

34 27 bytes

StringPartition[#<>"__",3]&

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String input, list of strings output

Jelly, 9 bytes

s3o€“___”

A monadic Link accepting a list of characters which yields a list of lists of characters (an empty input yields empty output).

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How?

s3o€“___” - Link: list of characters
s3        - split into chunks of three
   €      - for each chunk:
  o       -   OR (vectorises):
    “___” -     list of characters = ['_', '_', '_']

Notes:
The € is only necessary to handle the edge case of an empty input.
A full program can drop a trailing ”, but here we can't do that as the printing behaviour of a full program smashes everything together.

Equivalent 9:

o3ÐƤ“___”

Try it

Alternative 9:

;“___”s3Ṗ

Try it

J, 16 bytes

[:}:_3]\'___',~]

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K (oK), 19 17 bytes

-2 bytes thanks to ngn!

{-1_0N 3#x,"___"}

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Java 10, 116 113 bytes

s->{s+="__";int l=s.length()/3,i=l;var r=new String[l];for(;i-->0;)r[i]=s.substring(i*3,i*3+3);return l<1?0>1:r;}

Try it online.

Or 104 101 bytes if an empty array instead of false is allowed as output..

s->{s+="__";int l=s.length()/3;var r=new String[l];for(;l-->0;)r[l]=s.substring(l*3,l*3+3);return r;}

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Explanation:

s->{                             // Method with String as both parameter and return-type
  s+="__";                       //  Append two "_" to the input-String
  int l=s.length()/3;            //  Get the length, integer-divided by 3
  var r=new String[l];           //  Create a string-array with that many parts
  for(;l-->0;)                   //  Loop `l` in the range (l, 0]:
    r[l]=                        //   Set the `l`'th value of the array to:
         s.substring(l*3,l*3+3); //   Get the substring of size 3 from index `l*3` from `s`
  return r;}                     //  Return the array

Ruby, 73 42 bytes

a=gets
a.length!=0?a.scan(/.{1,3}/).map{|s|(s+'_'*3)[0,3]}:'falsey value'

Edit: As falsey value looks like it's not required:

gets.scan(/.{1,3}/).map{|s|(s+'_'*3)[0,3]}

C# (Visual C# Interactive Compiler), 74 bytes

Just append two underscores '_' at the end of the input to make sure they get printed if the length of the input isn't a factor of 3.

s=>Enumerable.Range(0,(s.Length+2)/3).Select(i=>(s+"__").Substring(i*3,3))

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Kotlin, 34 bytes

{"${it}__".chunked(3).dropLast(1)}

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C (gcc), 55 bytes

i;f(char*s){for(;i%4|*s;)putchar(++i%4?*s?*s++:95:10);}

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C (clang), 128 126 94 67 bytes

67 bytes thanks to @ceilingcat

f(char*k){for(;*k;k++)printf("%c%c%c\n",*k,*++k?*k:95,*++k?*k:95);}

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Bash, 90 bytes

This uses Bash features rather than a combination of more traditional Bourne shell plus *nix commands (which one version I created ended up at 205 bytes). I cheated by using the dodge of adding two _ characters to the string.

c=;read a;a=${a}__;while (($(echo ${#a})>2));do b=${a:0:3};c=$c\ $b;a=${a#$b};done;echo $c

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PowerShell, 58 35 bytes

$args-split'(...)'-ne''|% *ht 3 '_'

-23 bytes thanks to mazzy.

Try it online!

GNU sed, 27 bytes

s:$:__:
s:...:& :g
s: _*$::

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It gets a bit tricky regarding the empty string input, since sed has no meaning of a falsy value. So to deal with this, I provide you with two possible interpretations of the rules to validate my submission:

A. You essentially provide nothing as input, not even a trailing newline (as it is the case with all the examples, including that 6 Mb file).

Usage:

echo -n ""|sed -f script

Output: nothing is printed, because sed doesn't even run the script without input.

B. One could consider as falsy value for sed to be an unique string, i.e., returned only when the input is an empty string.

Usage:

echo ""|sed -f script

Output:

__

I prefer the first interpretation so much more, as I believe it to be the closest to the intended rule, but the last one helps if you run the script using that TIO link.

JavaScript (Babel Node), 45 bytes

_=>_.match(/.{1,3}/g).map(a=>a.padEnd(3,`_`))

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Jelly, 10 bytes

s3;€⁾__ḣ€3

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It feels like an 8 or 9 should be possible, but haven’t found one yet.

Attache, 34 23 bytes

PadRight&"_"&3=>@Chop&3

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Explanation (outdated)

{On[#_-1,PadRight&"_"&3,_]}@Chop&3
                           @Chop&3    chop the input string into groups of 3s
{On[#_-1               ,_]}           on the last group
        ,PadRight                         pad it
                     &3                   to length three
                 &"_"                     with underscores

Charcoal, 10 bytes

Ｅ⪪Ｓ³…⁺ι__³

Try it online! Link is to verbose version of code. Explanation:

  Ｓ         Input string
 ⪪ ³        Split into groups of up to 3 characters
Ｅ           Map over each group
      ι     Current group
     ⁺      Concatenated with
       __   Literal `__`
    …    ³  Moulded to length 3
            Each group implicitly printed on its own line

Scala, 31 bytes

(s+"___").grouped(3).toSeq.init

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Explanation

(s+"___")       // add "___"
  .grouped(3)   // make groups of 3
  .toSeq        // change to Seq
  .init         // take all but last

Befunge-93, 30 29 bytes

~:1+%,~:1+!"`"*+,~:1+!"`"*+,,

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Outputs nothing for an empty input, otherwise outputs strings of length 3 separated by NUL characters.

Explanation:

~                               Push character of input to stack
 :1+                            Duplicate input and add 1
    %                           Modulo top 2 values of stack and push result
                                If input was -1 (end of stream), calculate -1%0 -> halt
                                Otherwise calculate input%(input+1) -> input
     ,                          Pop and output character
      ~                         Push character of input to stack
       :1+!                     Duplicate input, add 1 and perform logical NOT
           "`"*                 Multiply by 96 (ASCII code for '`')
                                This returns 96 or 0 depending on the result of the NOT
               +                Add the top 2 values from the stack and push the result
                                If the input was -1 (end of stream), pushes -1+96=95, or the ASCII code for '_'
                                Otherwise pushes input+0
                ,               Pop and output character
                 ~:1+!"`"*+,    Same block again to handle the third character
                            ,   Output a NUL character (stack is empty, so popping from stack just returns 0)

The instruction pointer wraps around at the end, looping the entire line.