Tulis program atau fungsi yang:

1. mengambil string dari stdio atau argumen
2. menggantikan semua kemunculan truedengan falsedan falsedengantrue
3. membalikkannya, tetapi tidak membalikkan truedanfalse
4. mengembalikan atau mencetak hasil

Contoh (sisi kiri adalah input):

"true"                     "false"
"2false"                   "true2"
"true is false"            "true si false"
"false,true,undefined"     "denifednu,false,true"
"stressed-false"           "true-desserts"
"falstrue"                 "falseslaf"
"true false true x"        "x false true false"

Celah standar berlaku. Ini adalah kode-golf , jadi kode terpendek dalam byte menang.

Papan peringkat

var QUESTION_ID=63256,OVERRIDE_USER=20569;function answersUrl(e){return"http://api.stackexchange.com/2.2/questions/"+QUESTION_ID+"/answers?page="+e+"&pagesize=100&order=desc&sort=creation&site=codegolf&filter="+ANSWER_FILTER}function commentUrl(e,s){return"http://api.stackexchange.com/2.2/answers/"+s.join(";")+"/comments?page="+e+"&pagesize=100&order=desc&sort=creation&site=codegolf&filter="+COMMENT_FILTER}function getAnswers(){jQuery.ajax({url:answersUrl(answer_page++),method:"get",dataType:"jsonp",crossDomain:!0,success:function(e){answers.push.apply(answers,e.items),answers_hash=[],answer_ids=[],e.items.forEach(function(e){e.comments=[];var s=+e.share_link.match(/\d+/);answer_ids.push(s),answers_hash[s]=e}),e.has_more||(more_answers=!1),comment_page=1,getComments()}})}function getComments(){jQuery.ajax({url:commentUrl(comment_page++,answer_ids),method:"get",dataType:"jsonp",crossDomain:!0,success:function(e){e.items.forEach(function(e){e.owner.user_id===OVERRIDE_USER&&answers_hash[e.post_id].comments.push(e)}),e.has_more?getComments():more_answers?getAnswers():process()}})}function getAuthorName(e){return e.owner.display_name}function process(){var e=[];answers.forEach(function(s){var r=s.body;s.comments.forEach(function(e){OVERRIDE_REG.test(e.body)&&(r="<h1>"+e.body.replace(OVERRIDE_REG,"")+"</h1>")});var a=r.match(SCORE_REG);a&&e.push({user:getAuthorName(s),size:+a[2],language:a[1],link:s.share_link})}),e.sort(function(e,s){var r=e.size,a=s.size;return r-a});var s={},r=1,a=null,n=1;e.forEach(function(e){e.size!=a&&(n=r),a=e.size,++r;var t=jQuery("#answer-template").html();t=t.replace("{{PLACE}}",n+".").replace("{{NAME}}",e.user).replace("{{LANGUAGE}}",e.language).replace("{{SIZE}}",e.size).replace("{{LINK}}",e.link),t=jQuery(t),jQuery("#answers").append(t);var o=e.language;/<a/.test(o)&&(o=jQuery(o).text()),s[o]=s[o]||{lang:e.language,user:e.user,size:e.size,link:e.link}});var t=[];for(var o in s)s.hasOwnProperty(o)&&t.push(s[o]);t.sort(function(e,s){return e.lang>s.lang?1:e.lang<s.lang?-1:0});for(var c=0;c<t.length;++c){var i=jQuery("#language-template").html(),o=t[c];i=i.replace("{{LANGUAGE}}",o.lang).replace("{{NAME}}",o.user).replace("{{SIZE}}",o.size).replace("{{LINK}}",o.link),i=jQuery(i),jQuery("#languages").append(i)}}var ANSWER_FILTER="!t)IWYnsLAZle2tQ3KqrVveCRJfxcRLe",COMMENT_FILTER="!)Q2B_A2kjfAiU78X(md6BoYk",answers=[],answers_hash,answer_ids,answer_page=1,more_answers=!0,comment_page;getAnswers();var SCORE_REG=/<h\d>\s*([^\n,]*[^\s,]),.*?(\d+)(?=[^\n\d<>]*(?:<(?:s>[^\n<>]*<\/s>|[^\n<>]+>)[^\n\d<>]*)*<\/h\d>)/,OVERRIDE_REG=/^Override\s*header:\s*/i;

body{text-align:left!important}#answer-list,#language-list{padding:10px;width:290px;float:left}table thead{font-weight:700}table td{padding:5px}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <link rel="stylesheet" type="text/css" href="//cdn.sstatic.net/codegolf/all.css?v=83c949450c8b"> <div id="answer-list"> <h2>Leaderboard</h2> <table class="answer-list"> <thead> <tr><td></td><td>Author</td><td>Language</td><td>Size</td></tr></thead> <tbody id="answers"> </tbody> </table> </div><div id="language-list"> <h2>Winners by Language</h2> <table class="language-list"> <thead> <tr><td>Language</td><td>User</td><td>Score</td></tr></thead> <tbody id="languages"> </tbody> </table> </div><table style="display: none"> <tbody id="answer-template"> <tr><td>{{PLACE}}</td><td>{{NAME}}</td><td>{{LANGUAGE}}</td><td>{{SIZE}}</td><td><a href="{{LINK}}">Link</a></td></tr></tbody> </table> <table style="display: none"> <tbody id="language-template"> <tr><td>{{LANGUAGE}}</td><td>{{NAME}}</td><td>{{SIZE}}</td><td><a href="{{LINK}}">Link</a></td></tr></tbody> </table>

C # 6, 144 byte

string R(string t)=>string.Concat(new System.Text.RegularExpressions.Regex("true|false").Replace(t,m=>m.Value[0]<'g'?"eurt":"eslaf").Reverse());

Itu menggunakan ekspresi reguler untuk mencocokkan true|false, dan jika cocok trueitu akan digantikan oleh eslaf, jika tidak oleh eurt. m.Value[0]<'g'adalah cara yang lebih singkat untuk mengatakan m.Value[0]=="false", karena satu-satunya nilai yang mungkin untuk m.Valueare "true"atau "false", jadi jika kode char dari char pertama lebih kecil dari kode char 'g', itu "false".

Versi lama, 95 byte

Yang ini memiliki bug, tidak mengembalikan output yang benar untuk falstrue.

string R(string t)=>string.Concat(t.Reverse()).Replace("eurt","false").Replace("eslaf","true");

TeaScript , 36 25 24 byte

xv¡g("eurt|eslaf",#ln>4)   

TeaScript adalah JavaScript untuk bermain golf.

Suntingan: Disimpan 11 byte berkat @ Vɪʜᴀɴ. Memperbaiki input falstruedan menyimpan satu byte.

Versi lama (Tidak Valid):

xv¡g("eurt",f)g(f.T¡v¡,t)

Penjelasan:

x    // Input
 v¡    // Reverse
   g("eurt",    // Global replace "eurt" with "false".
            f)    // f is predefined to false.
              g(f.T¡v¡, // Convert false to string, then reverse.
                       t) // t is predefined to true.

Bash+GNU, 45 38 73 bytes

Edit: works with both trufalse and falstrue

sed s/false/%eurt%/g\;s/true/%eslaf%/g|rev|sed "s/%\(true\|false\)%/\1/g"

Old version, 38 bytes (shortened, thanks to Digital Trauma):

rev|sed s/eurt/false/g\;s/eslaf/true/g

JavaScript ES6, 59

As an anonymous function.

Note, replace is used just as a shorthand for match().map(). The replaced string is discarded, and the output string is made piece by piece backwards (so no need to reverse).

s=>s.replace(/false|true|./g,x=>s=(x[1]?x<'t':x)+s,s='')&&s

Test running the snippet below in an EcmaScript 6 compliant browser.

f=s=>s.replace(/false|true|./g,x=>s=(x[1]?x<'t':x)+s,s='')&&s

//test

console.log=x=>O.innerHTML+=x+'\n'

;[
 ["true","false"]
,["falstrue","falseslaf"]  
,["1false","true1"]
,["true is false","true si false"]
,["false,true,undefined","denifednu,false,true"]
,["stressed-false","true-desserts"]
,["true false true x","x false true false"]
].forEach(t=>console.log(t[0]+' -> '+f(t[0])))

<pre id=O></pre>

Windows Batch, 184 213 bytes

Fixed the bug, falstrue -> falseslaf and trufalse -> trueurt

Probably one of the less popular languages:

setlocal enabledelayedexpansion
set /p Q=
set N=0
:L
call set T=%%Q:~%N%,1%%%
set /a N+=1
if not "%T%" equ "" (
set R=%T%%R%
goto L
)
set R=%R:eurt=false%
set R=%R:eslaf=true%
set R=%R:falstrue=falseslaf%
echo %R%

Haskell, 94 bytes

Performs pattern matching on the input string, looking for "false" or "true" and appends the opposite to the result of applying the function on the remainder of the string. If true or false isn't found, it uses recursion to reverse the string in the same fashion.

f[]=[]
f('t':'r':'u':'e':s)=f s++"false"
f('f':'a':'l':'s':'e':s)=f s++"true"
f(x:s)=f s++[x]

JavaScript ES6, 95 93 bytes

Unnamed function. Add f= to the beginning to use it. Thanks Ismael! Also assumes that the input does not contain tabs.

x=>[...x[r="replace"](/false/g,"\teslaf")[r](/(\t)*true/g,"eurt")[r](/\t/g,"")].reverse().join``

Pyth, 30 bytes

::_z"eurt""false""eslaf""true"

This reverses the input (_z), substitutes "eurt" for "false" and "eslaf" for "true". Replacement is done using :.

Try it online

rs, 56 bytes

\t
+(.*\t)(.)(.*)/\2\1\3
\t/
eurt/fals\t
eslaf/true
\t/e

Live demo and test cases.

Julia, 59 55 46 bytes

s->replace(reverse(s),r"eurt|eslaf",i->i<"et")

This creates an unnamed function that accepts a string and returns a string. To call it, give it a name, e.g. f=s->....

The input is reversed using reverse. We match on the regular expression eurt|eslaf which matches true or false backwards. To the match we apply a function that returns true if the match is lexicographically smaller than et (i.e. eslaf) and false otherwise. The boolean literals are converted to string in the output.

Saved 9 bytes and fixed an issue thanks to Glen O!

Javascript, 135 Bytes

function(s){return s.split("").reverse().join("").replace(/eslaf/i,'☺').replace(/eurt/i,'☻').replace(/☻/g,!1).replace(/☺/g,!1)}

Test:

=>"false is the opposite of true"

<="true fo etisoppo eht si false"

Thanks ProgramFOX and edc65 for pointing out a bug!

Java, 162 98 92 bytes

Thanks (and sorry!~) to @DanielM. for telling me about StringBuffer and the fact that we can use functions!

Because, you know, Java.

s->(""+new StringBuffer(s.replaceAll("false","eurt")).reverse()).replaceAll("eurt","false");

Returns the correct, reversed string.

Ungolfed Version:

s->new StringBuilder(
    s.replaceAll("false","eurt"))
    .reverse().toString().replaceAll("eurt","false");

Basically, I replace all instances of "false" with a backwards "true", then reverse the entire string, and then replace the now backwards versions of "true" (not the ones I just replaced) with "false". Easy peasy.

Mathematica, 64 bytes

StringReverse@#~StringReplace~{"eurt"->"false","eslaf"->"true"}&

Python 3, 68 100 bytes

I'm still golfing it, but it's fixed to the bug, so falstrue -> falselsaf and trufalse -> trueurt

Pretty straightforward:

print(input()[::-1].replace("eurt","false").replace("eslaf","true").replace("falstrue","falseslaf"))

Japt, 26 bytes

Note: This may be invalid, as it requires bug fixes made after this challenge was posted.

Uw r"eurt|eslaf",X=>X<"et"

Try it in the online interpreter! (Arrow function requires ES6-compliant browser, such as Firefox.)

How it works

             // Implicit: U = input string
Uw r         // reverse U, then replace:
"eurt|eslaf" // occurrences of either "eurt" or "eslaf"
X=>X<"et"    // with "false" or "true", respectively
             // Implicit: output last expression

Here's a version that worked before the bug fixes: (38 bytes)

Uw $.replace(/eurt|eslaf/g,X=>X<"et")$

Gema, 43

*=@a{@reverse{*}};a:eurt=false;a:eslaf=true

(Gema is an obscure macro language.)

Pyth, 28 22

Amr`!dZ2jHjLGcR_Hc_z_G

6 bytes thanks to Jakube

Works correctly for falstrue, as shown in the suite below.

Test suite

Haskell, 102 bytes

h('t':'r':'u':'e':s)="eslaf"++h s
h('f':'a':'l':'s':'e':s)="eurt"++h s
h(x:s)=x:h s
h[]=""
r=reverse.h

The replacement of "true" by "false" and vice-versa is quite lengthy with the pattern-matching, but at least it deals correctly with "falstrue" and the like. And besides, I suspect that a correct regex-based version would be a bit longer.

Python 3 - 108 92 bytes

import re
print(re.sub("eslaf|eurt",lambda m:repr(len(m.group(0))>4).lower(),input()[::-1]))

Uses a regex to match on "true" or "false" and uses a lambda to process matches and choose what to use as a replacement string. Using repr gets the string representation of (len(match)>4) which gives "True" when "false" is matched and vice versa (and use .lower() because repr(bool) gives a capitalized string) to get the inverse of the match and finish up by reversing the replacement and then the processed input using [::-1]

Managed to get the length down 16 bytes from TFelds suggestions.

Edit: Python is back in front of java, no need for alarm.

𝔼𝕊𝕄𝕚𝕟, 40 chars / 65 bytes

ô[…ïċ/false|true/g,⇏[…⬯+!שúa]ù⬮ø⬯)]ù⬮ø⬯)

Try it here (Firefox only).

Thanks to @feersum for pointing out a bug!

21 chars / 43 bytes, non-competitive

ôᴙ(ïċ/⊭|⊨⌿,↪ᴙ(⬯+!ë$⸩⸩

Try it here (Firefox only).

Prolog, 225 bytes

p(X):-string_to_list(X,L),reverse(L,B),q(B,C),string_to_list(Z,C),write(Z),!.
q([],[]).
q([101,117,114,116|T],[102,97,108,115,101|L]):-q(T,L).
q([101,115,108,97,102|T],[116,114,117,101|L]):-q(T,L).
q([H|T],[H|L]):-q(T,L).

Try it out online here
Run by querying in the following way:

p("falstrue").

Ruby, 55 bytes

->s{s.gsub(/true|false/){$&[?t]?:eslaf: :eurt}.reverse}

Test:

->s{s.gsub(/true|false/){$&[?t]?:eslaf: :eurt}.reverse}["false,true,undefined"]
=> "denifednu,false,true"

Perl 5, 68 bytes

67 plus 1 for -E instead of -e

%a=(false,eurt,true,eslaf);say~~reverse<>=~s/false|true/$a{$&}/gr

OpenSCAD, 178 bytes

(Note that this uses the String Theory library, as OpenSCAD doesn't exactly have a standard library. Additionally, this is a function because the only allowed input is to hard-code it.

use <Strings.scad>;function f(a)=contains(g(a),"eurt")?replace(g(a),"eurt","false"):g(a);function g(a)=contains(reverse(a),"eslaf")?replace(reverse(a),"eslaf","true"):reverse(a);

C#, 260 bytes

using System;class P{static void Main(){var y=Console.ReadLine();char[] n=y.ToCharArray();Array.Reverse(n);var s=new string(n);if(s.Contains("eslaf")){s=s.Replace("eslaf","true");}if(s.Contains("eurt")){s=s.Replace("eurt","false");}Console.WriteLine(s);}}

PHP, 60 bytes

Simple, reverses the string first, then replaces the reversed versions with their respective swaps.

"falstrue" becomes "eurtslaf" becomes "falseslaf".

<?=strtr(strrev($argv[1]),{'eurt'=>'false','eslaf'=>'true'})

Perl 5.10, 54 bytes

$_=reverse<>;s/(eurt)|(eslaf)/$1?"false":"true"/eg;say

Reverse, then replace. A different way of doing it besides the hash table used for the other Perl answer, which ends up being shorter!

Try it online.

Pyth - 18 bytes

Can be golfed a lot more.

Amr`!dZ2::_z_GH_HG

Test Suite.