Will it halt? (Robbers)

Question

This is the robbers' thread. The cops' thread is here.

Your challenge is to crack a cop's submission by finding an input that makes it halt. You don't have to find out why, or all inputs that make it halt if there's more than one, or the input the cop intended, just one input will do.

Once you have cracked a submission, post a link to it in a comment or edit to the cop's post. You can also flag your submission for a mod to edit it in the cop's post. Also, post the input used and a link to the cop's post in an answer in this thread. The robber that cracks the most submissions wins.

Multiple people can post cracks to the same cop submission, as long as they are different.

(If SE converted your duplicate answer to a comment, you may want to vote on this feature request)

Looking for uncracked submissions?

fetch("https://api.stackexchange.com/2.2/questions/135363/answers?order=desc&sort=activity&site=codegolf&filter=!.Fjs-H6J36vlFcdkRGfButLhYEngU&key=kAc8QIHB*IqJDUFcjEF1KA((&pagesize=100").then(x=>x.json()).then(data=>{var res = data.items.filter(i=>!i.body_markdown.toLowerCase().includes("cracked")).map(x=>{const matched = /^ ?##? ?(?:(?:(?:\[|<a href ?= ?".*?">)([^\]]+)(?:\]|<\/a>)(?:[\(\[][a-z0-9/:\.]+[\]\)])?)|([^, ]+)).*[^\d](\d+) ?\[?(?:(?:byte|block|codel)s?)(?:\](?:\(.+\))?)? ?(?:\(?(?!no[nt][ -]competing)\)?)?/gim.exec(x.body_markdown);if(!matched){return;}return {link: x.link, lang: matched[1] || matched[2], owner: x.owner}}).filter(Boolean).forEach(ans=>{var tr = document.createElement("tr");var add = (lang, link)=>{var td = document.createElement("td");var a = document.createElement("a");a.innerText = lang;a.href = link;td.appendChild(a);tr.appendChild(td);};add(ans.lang, ans.link);add(ans.owner.display_name, ans.owner.link);document.querySelector("tbody").appendChild(tr);});});

<html><body><h1>Uncracked Submissions</h1><table><thead><tr><th>Language</th><th>Author</th></tr></thead><tbody></tbody></table></body></html>

Does different mean different inputs (say, all inputs ending with 2 crack the cop's post - can you different people post different numbers ending in 2?) or different families of inputs, or different types of inputs? — Stephen, Commented Jul 24, 2017 at 17:03
Multiple people can post cracks to the same cop submission... Please define different. — Dennis, Commented Jul 25, 2017 at 13:41

Mr. Xcoder · Accepted Answer · 2017-07-24 18:13:24Z

0

Add++, caird coinheringaahing

The empty input. The answer is pretty pointless, since it never runs in an infinite loop.

Try it online!

answered Jul 24, 2017 at 18:13

Mr. Xcoder

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Gavin S. Yancey · Accepted Answer · 2017-07-24 21:51:47Z

0

Node.JS, programmer5000

x = {}
x.constructor = false
f(x)

We define an object where x.constructor is false so it terminates immediately

TIO

answered Jul 24, 2017 at 21:51

Gavin S. Yancey

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

0

Python 3, Erik Brody Dreyer

While error raising cracks are 10 a penny, a simple non-erroring one is just 88 zeros in a row:

def fun(n):
while not (int(n[17]+n[:17])==2*int(n[:18]) and int(n[45]+n[18:45])==3*int(n[18:46]) and int(n[87]+n[46:87])==5*int(n[46:88])):
    print("Ha")
fun("0"*88)
print("halted and did not error")

Try it online!

edited Jun 17, 2020 at 9:04

CommunityBot

1

answered Jul 24, 2017 at 21:57

Jonathan Allan

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Conor O'Brien · Accepted Answer · 2017-07-24 22:36:12Z

0

JavaScript (Node.js), programmer5000

Object.defineProperty(a={},"__proto__",{value:false,writable:false})

Try it online!

Simple enough. A truthy object who's __proto__ is defined to be false permanently.

answered Jul 24, 2017 at 22:36

Conor O'Brien

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Adnan · Accepted Answer · 2017-07-24 23:21:24Z

0

Braingolf, Mayube

Answer

Code explanation:

1+[#£-0!e>:$_1>|]

1+                  # Add 1 to the input
  [             ]   # While bottom of the stack > 0..
   #£               #   Push 163
     -              #   Subtract from the input
      0             #   Push 0
       !            #   Peek top of the stack 
        e           #   If greater than zero, do..
         >          #     Rotate the stack one to the right
          :         #   Else..
           $_       #     Discard top of the stack
             1      #     Push
              >     #     Rotate the stack one to the right
               |    #   End ifelse

Which results in outputting 0.

Try it online!

edited Jul 24, 2017 at 23:21

answered Jul 24, 2017 at 18:14

Adnan

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\$\begingroup\$ Woop! You got it! Fyi 163 is the Unicode codepoint of £ \$\endgroup\$
– Mayube
Commented Jul 24, 2017 at 18:18
\$\begingroup\$ @Mayube Yeah, just running #£ alone gave it a bit away :p. \$\endgroup\$
– Adnan
Commented Jul 24, 2017 at 18:22
\$\begingroup\$ Darn! I actually tested 163 as an argument and it didn't work at all! \$\endgroup\$
– Erik the Outgolfer
Commented Jul 24, 2017 at 19:58
\$\begingroup\$ @EriktheOutgolfer then you did something wrong, it's taken as an argument \$\endgroup\$
– Mayube
Commented Jul 24, 2017 at 20:09
\$\begingroup\$ @Mayube I just passed in 163...maybe I saw something wrong. \$\endgroup\$
– Erik the Outgolfer
Commented Jul 24, 2017 at 20:09

| Show 3 more comments

Phoenix Vizva'i · Accepted Answer · 2017-07-25 01:45:32Z

0

JavaScript (Babel Node), programmer5000

new Set() was posted as a crack but didn't work for me (Try it online!), so I made one that doesn't throw, but does create a TypeError.

let f=x=>{while(x+"h");}

class Halt {
    toString() {
	return {}
    }
}
f(new Halt())

Try it online!

P.S. The solution I really wanted was to negate the charCode somehow and be errorless but I couldn't get that to not resolve to concatenation. :)

EDIT: An more modern alternative:

f( {
    [Symbol.toPrimitive] (hint) {
        return {}
    }
} )

edited Jul 25, 2017 at 1:45

answered Jul 25, 2017 at 1:16

Phoenix Vizva'i

1013 bronze badges

\$\begingroup\$ Good, but still not desired! \$\endgroup\$
– user58826
Commented Jul 25, 2017 at 1:19
\$\begingroup\$ So there's an error-free solution? \$\endgroup\$
– Phoenix Vizva'i
Commented Jul 25, 2017 at 1:21
1

\$\begingroup\$ A solution that doesn't use throw. \$\endgroup\$
– user58826
Commented Jul 25, 2017 at 1:22

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Hawkings · Accepted Answer · 2017-07-25 11:48:54Z

0

JavaScript (browser), tsh

document.all

I started trying falsy values. document.all did the job.

answered Jul 25, 2017 at 11:48

Hawkings

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totallyhuman · Accepted Answer · 2017-07-25 16:18:54Z

0

JavaScript (Node.js), Step Hen

Array(4) works because it is creating an empty array of size 4 and the string representation of that is ,,,.

Try it online!

answered Jul 25, 2017 at 16:18

totallyhuman

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Veedrac · Accepted Answer · 2017-07-25 16:23:53Z

0

Java 8, Socratic Phoenix

These anonymous class answers are getting a bit overdone, but it works and I have no shame.

import java.util.ArrayList;

// ...

new ArrayList<Object>() {
    public boolean isEmpty() {
        boolean ret = !super.isEmpty();
        add(new Object());
        return ret;
    }
}

You can avoid the import if you're patient enough to build out all the List methods. I'm not.

Try it online.

answered Jul 25, 2017 at 16:23

Veedrac

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tsh · Accepted Answer · 2017-07-26 01:52:46Z

0

JavaScript (Node.js) by Alex Varga

({toString(){return this.t--;},t:1})

Try it online!

answered Jul 26, 2017 at 1:52

tsh

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\$\begingroup\$ yep. golfed a little: {valueOf:()=>this.q?0:this.q=1} \$\endgroup\$
– Alex Varga
Commented Jul 26, 2017 at 15:09

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Veedrac · Accepted Answer · 2017-07-26 03:10:24Z

0

R, Gregor

expression(set.seed(5))

Similar principle to my other R answer. Seems to work.

Try it online.

answered Jul 26, 2017 at 3:10

Veedrac

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Rift · Accepted Answer · 2017-07-26 11:44:01Z

0

R, Jarko Dubbeldam

just break out of the while loop

expression(break)

answered Jul 26, 2017 at 11:44

Rift

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Mischa · Accepted Answer · 2017-07-26 14:40:48Z

0

R, Jarko Dubbeldam

it's my first time that I participated at something like this... hope i got it right.

.Internal(.invokeRestart(list(NULL, NULL), NULL))

Try it online!

answered Jul 26, 2017 at 14:40

Mischa

1173 bronze badges

\$\begingroup\$ I guess that's the intended solution. f(quit()) would also work \$\endgroup\$
– Rift
Commented Jul 26, 2017 at 15:30
1

\$\begingroup\$ This is not really a crack. Both this solution and @Rift quit before (or regardless of) evaluating the function. \$\endgroup\$
– JAD
Commented Jul 27, 2017 at 7:41
\$\begingroup\$ Both solutions are evaluated in the function body. \$\endgroup\$
– Rift
Commented Jul 27, 2017 at 8:05

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

0

CPython 3.6, by wizzwizz4

1/0

Almost certainly not the intended solution, but it works

edited Jun 17, 2020 at 9:04

CommunityBot

1

answered Jul 26, 2017 at 15:17

The Fifth Marshal

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Veedrac · Accepted Answer · 2017-07-26 22:39:25Z

0

SmallTalk, Yimin Rong

I should have trusted him.

answered Jul 26, 2017 at 22:39

Veedrac

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Veedrac · Accepted Answer · 2017-07-26 23:07:44Z

0

JavaScript, Birjolaxew

Object.freeze({[Symbol.toPrimitive]() { raise; }})

answered Jul 26, 2017 at 23:07

Veedrac

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\$\begingroup\$ raise isn't a JS keyword, you might be looking for throw \$\endgroup\$
– SuperStormer
Commented Jul 27, 2017 at 1:26
1

\$\begingroup\$ @SuperStormer Doesn't matter anyway :P. \$\endgroup\$
– Veedrac
Commented Jul 27, 2017 at 1:26

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Veedrac · Accepted Answer · 2017-07-27 03:41:07Z

0

JavaScript (ES7), iovoid

46474849

WolframAlpha made the calcs trivial.

answered Jul 27, 2017 at 3:41

Veedrac

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

0

JavaScript (ES7), Step Hen

I've found 5 solutions that work, so far:

[]

new Array()

Array.prototype

String.prototype

Number.prototype

Strangely, Object.prototype doesn't work.

edited Jun 17, 2020 at 9:04

CommunityBot

1

answered Jul 27, 2017 at 16:38

Shaggy

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\$\begingroup\$ Oh, I completely forgot that that is basically the same as my intended solution. I'd love for you to figure out why though :P it's a really weird perk of floats I just discovered \$\endgroup\$
– Stephen
Commented Jul 27, 2017 at 16:45
\$\begingroup\$ I'll come back to it in the morning, @StepHen; I'm about to pack up for the day. \$\endgroup\$
– Shaggy
Commented Jul 27, 2017 at 16:46
\$\begingroup\$ I'll tell you why. Check Boolean(input) and Number(input) for each of those as input. The "weird perk of floats" is that the exponentiation operator ** will convert any left operand, even something that coerces to NaN, into 1 if the right operand coerces to 0. Since Number(Object.prototype) is NaN and not 0 like the rest of the working inputs, it will not work. \$\endgroup\$
– Patrick Roberts
Commented Jul 29, 2017 at 4:57

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Patrick Roberts · Accepted Answer · 2017-07-27 22:30:30Z

0

JavaScript, Birjolaxew

new Proxy({},{get(){throw''}})

answered Jul 27, 2017 at 22:30

Patrick Roberts

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ovs · Accepted Answer · 2017-07-28 06:34:31Z

0

Befunge 93, Dopapp

The code calculates (ord(input) - 3*4*5) / 0 = (ord(input) - 60) / 0, which gives Infinity or -Infinity for any ascii value ≠60 and NaN for ascii value 60 (<) on the linked interpreter. The part #v_@ only terminates if the top value of the stack is falsy, which is only the case for NaN.

answered Jul 28, 2017 at 6:34

ovs

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Eric Duminil · Accepted Answer · 2017-07-29 15:01:11Z

Python3, by AlexHall

Probably not what OP had in mind:

help.__doc__

Here's a test on my system:

Python 3.6.0 |Anaconda 4.3.1 (64-bit)| (default, Dec 23 2016, 12:22:00) 
[GCC 4.4.7 20120313 (Red Hat 4.4.7-1)] on linux
>>> s = "help.__doc__"
>>> len(s)
12
>>> eval(s)
"Define the builtin 'help'.\n\n    This is a wrapper around pydoc.help that provides a helpful message\n    when 'help' is typed at the Python interactive prompt.\n\n    Calling help() at the Python prompt starts an interactive help session.\n    Calling help(thing) prints help for the python object 'thing'.\n    "
>>> len(eval(s))
307

It doesn't work with Python2 on my system.

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

0

BrainF, MilkyWay90

0

I brute forced this one. My first guess was correct. And two subsequent inputs to make sure I was right.

Oops?

edited Jun 17, 2020 at 9:04

CommunityBot

1

answered Dec 19, 2018 at 3:29

Draco18s no longer trusts SE

3,39915 silver badges25 bronze badges

\$\begingroup\$ Never thought about bruteforcing, actually. \$\endgroup\$
– MilkyWay90
Commented Dec 20, 2018 at 0:13

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KeroppiMomo · Accepted Answer · 2019-07-16 03:37:12Z

JavaScript (Node.js)

I've done some research, and find out that JavaScript that only uses ()[]+! is called JSFuck. With the help of JScrewIt and JS Minify, I've found the solution:

"[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]][([]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[!![]+!![]+!![]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[+!![]+[+[]]]+([][[]]+[])[+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+([]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[!![]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[+!![]+[+[]]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+(!![]+[])[!![]+!![]+!![]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[!![]+!![]+[+[]]]+(!![]+[])[!![]+!![]+!![]]+([]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[!![]+!![]+[!![]+!![]+!![]]]+(![]+[])[+!![]]+(![]+[])[!![]+!![]])()(([]+[])[(![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[+!![]+[+[]]]+([][[]]+[])[+!![]]+(!![]+[])[+[]]+([]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[!![]+!![]+!![]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[+!![]+[+[]]]+(!![]+[])[+!![]]]()[+!![]+[!![]+!![]]]+(+[![]]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]][([]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[!![]+!![]+!![]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[+!![]+[+[]]]+([][[]]+[])[+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+([]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[!![]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[+!![]+[+[]]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+(!![]+[])[!![]+!![]+!![]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(!![]+[])[(![]+[])[!![]+!![]+!![]]+([][[]]+[])[+[]]+([][(!![]+[])[!![]+!![]+!![]]+([][[]]+[])[+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([![]]+[][[]])[+!![]+[+[]]]+(!![]+[])[!![]+!![]+!![]]+(![]+[])[!![]+!![]+!![]]]()+[])[!![]+!![]]]()[+!![]+[+[]]]+![]+(!![]+[])[(![]+[])[!![]+!![]+!![]]+([][[]]+[])[+[]]+([][(!![]+[])[!![]+!![]+!![]]+([][[]]+[])[+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([![]]+[][[]])[+!![]+[+[]]]+(!![]+[])[!![]+!![]+!![]]+(![]+[])[!![]+!![]+!![]]]()+[])[!![]+!![]]]()[+!![]+[+[]]])()[([]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[!![]+!![]+!![]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[+!![]+[+[]]]+([][[]]+[])[+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+([]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[!![]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[+!![]+[+[]]]+(!![]+[])[+!![]]](([]+[])[(![]+[])[!![]+!![]+!![]]+([][[]]+[])[+[]]+([][(!![]+[])[!![]+!![]+!![]]+([][[]]+[])[+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([![]]+[][[]])[+!![]+[+[]]]+(!![]+[])[!![]+!![]+!![]]+(![]+[])[!![]+!![]+!![]]]()+[])[!![]+!![]]]()))[+!![]+[+[]]]+([][[]]+[])[+[]]+(!![]+!![]+[])+(!![]+!![]+!![]+!![]+!![]+!![]+[])+(+[]+[])+(!![]+!![]+!![]+!![]+!![]+!![]+[])+([]+[])[(![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[+!![]+[+[]]]+([][[]]+[])[+!![]]+(!![]+[])[+[]]+([]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[!![]+!![]+!![]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[+!![]+[+[]]]+(!![]+[])[+!![]]]()[+!![]+[!![]+!![]]])+(([]+[]+[]+[]+[]+[]+[]+[]+[]+[]))"

Try it online!

Explanation

[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]][([]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[!![]+!![]+!![]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[+!![]+[+[]]]+([][[]]+[])[+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+([]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[!![]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[+!![]+[+[]]]+(!![]+[])[+!![]]]((!![]+[])[+!![]]+(!![]+[])[!![]+!![]+!![]]+(!![]+[])[+[]]+([][[]]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+!![]]+(![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[!![]+!![]+[+[]]]+(!![]+[])[!![]+!![]+!![]]+([]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[!![]+!![]+[!![]+!![]+!![]]]+(![]+[])[+!![]]+(![]+[])[!![]+!![]])()( // eval function, copied from https://jscrew.it/ with only Node.js support
                                                                                                                        // '"'
    ([]+[])[                                                                                                                // ''['fontcolor']() == '<font color="undefined"></font>'
        (![]+[])[+[]]+                                                                                                          // f
        (!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[+!![]+[+[]]]+              // o
        ([][[]]+[])[+!![]]+                                                                                                     // n
        (!![]+[])[+[]]+                                                                                                         // t
        ([]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[!![]+!![]+!![]]+             // c
        (!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[+!![]+[+[]]]+              // o
        (![]+[])[!![]+!![]]+                                                                                                    // l
        (!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[+!![]+[+[]]]+              // o
        (!![]+[])[+!![]]                                                                                                        // r
    ]()[                                                                                                                    // ''['fontcolor']()['12'] == 'u'
        +!![]+                                                                                                                  // 1
        [!![]+!![]]                                                                                                             // 2
    ]+
    (                                                                                                                   // '\\'
        +[![]]+                                                                                                             // NaN
        [][                                                                                                                 // []['fill']
            (![]+[])[+[]]+                                                                                                      // f
            ([![]]+[][[]])[+!![]+[+[]]]+                                                                                        // i
            (![]+[])[!![]+!![]]+                                                                                                // l
            (![]+[])[!![]+!![]]                                                                                                 // l
        ][                                                                                                                  // []['fill']['constructor']
            ([]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[!![]+!![]+!![]]+         // c
            (!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[+!![]+[+[]]]+          // o
            ([][[]]+[])[+!![]]+                                                                                                 // n
            (![]+[])[!![]+!![]+!![]]+                                                                                           // s
            (!![]+[])[+[]]+                                                                                                     // t
            (!![]+[])[+!![]]+                                                                                                   // r
            ([][[]]+[])[+[]]+                                                                                                   // u
            ([]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[!![]+!![]+!![]]+         // c
            (!![]+[])[+[]]+                                                                                                     // t
            (!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[+!![]+[+[]]]+          // o
            (!![]+[])[+!![]]                                                                                                    // r
        ](                                                                                                                  // []['fill']['constructor']('return/false/')() == /false/
            (!![]+[])[+!![]]+                                                                                                   // r
            (!![]+[])[!![]+!![]+!![]]+                                                                                          // e
            (!![]+[])[+[]]+                                                                                                     // t
            ([][[]]+[])[+[]]+                                                                                                   // u
            (!![]+[])[+!![]]+                                                                                                   // r
            ([][[]]+[])[+!![]]+                                                                                                 // n
                                                                                                                                // /
            (!![]+[])[                                                                                                              // 'true'['sub']() == '<sub>true</sub>'
                (![]+[])[!![]+!![]+!![]]+                                                                                               // s
                ([][[]]+[])[+[]]+                                                                                                       // u
                (                                                                                                                       // b
                    [][                                                                                                                     // []['entries']
                        (!![]+[])[!![]+!![]+!![]]+                                                                                              // e
                        ([][[]]+[])[+!![]]+                                                                                                     // n
                        (!![]+[])[+[]]+                                                                                                         // t
                        (!![]+[])[+!![]]+                                                                                                       // r
                        ([![]]+[][[]])[+!![]+[+[]]]+                                                                                            // i
                        (!![]+[])[!![]+!![]+!![]]+                                                                                              // e
                        (![]+[])[!![]+!![]+!![]]                                                                                                // s
                    ]()+                                                                                                                    // []['entries']() == Object [Array Iterator] {}
                    []                                                                                                                      // []['entries']() + [] == '[object Array Iterator]'
                )[!![]+!![]]                                                                                                                // '[object Array Iterator]'[2] == 'b'
            ]()[+!![]+[+[]]]+                                                                                                       // '<sub>true</sub>'[10] == '/'
            ![]+                                                                                                                // 'false'
            (!![]+[])[                                                                                                          // / (see above)
                (![]+[])[!![]+!![]+!![]]+
                ([][[]]+[])[+[]]+
                (
                    [][
                        (!![]+[])[!![]+!![]+!![]]+
                        ([][[]]+[])[+!![]]+
                        (!![]+[])[+[]]+
                        (!![]+[])[+!![]]+
                        ([![]]+[][[]])[+!![]+[+[]]]+
                        (!![]+[])[!![]+!![]+!![]]+
                        (![]+[])[!![]+!![]+!![]]
                    ]()
                    +[]
                )[!![]+!![]]
            ]()[+!![]+[+[]]]
        )()[                                                                                                                // /false/['constructor']
            ([]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[!![]+!![]+!![]]+         // c
            (!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[+!![]+[+[]]]+          // o
            ([][[]]+[])[+!![]]+                                                                                                 // n
            (![]+[])[!![]+!![]+!![]]+                                                                                           // s
            (!![]+[])[+[]]+                                                                                                     // t
            (!![]+[])[+!![]]+                                                                                                   // r
            ([][[]]+[])[+[]]+                                                                                                   // u
            ([]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[!![]+!![]+!![]]+         // c
            (!![]+[])[+[]]+                                                                                                     // t
            (!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[+!![]+[+[]]]+          // o
            (!![]+[])[+!![]]                                                                                                    // r
        ](                                                                                                                  // /false/['constructor']('<sub></sub>') == /<sub><\/sub>/
            ([]+[])[
                (![]+[])[!![]+!![]+!![]]+                                                                                       // s
                ([][[]]+[])[+[]]+                                                                                               // u
                (                                                                                                               // b
                    [][
                        (!![]+[])[!![]+!![]+!![]]+
                        ([][[]]+[])[+!![]]+
                        (!![]+[])[+[]]+
                        (!![]+[])[+!![]]+
                        ([![]]+[][[]])[+!![]+[+[]]]+
                        (!![]+[])[!![]+!![]+!![]]+
                        (![]+[])[!![]+!![]+!![]]
                    ]()+[]
                )[!![]+!![]]
            ]()                                                                                                                 // '<sub></sub>'
        )
    )[+!![]+[+[]]]+                                                                                                         // 'NaN/<sub><\\/sub>/'[10] == '\\'
    ([][[]]+[])[+[]]+                                                                                                   // u
    (!![]+!![]+[])+                                                                                                     // 2
    (!![]+!![]+!![]+!![]+!![]+!![]+[])+                                                                                 // 6
    (+[]+[])+                                                                                                           // 0
    (!![]+!![]+!![]+!![]+!![]+!![]+[])+                                                                                 // 6
    ([]+[])[                                                                                                            // '"'
        (![]+[])[+[]]+
        (!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[+!![]+[+[]]]+
        ([][[]]+[])[+!![]]+
        (!![]+[])[+[]]+
        ([]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[!![]+!![]+!![]]+
        (!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[+!![]+[+[]]]+
        (![]+[])[!![]+!![]]+
        (!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(![]+[])[!![]+!![]]])[+!![]+[+[]]]+
        (!![]+[])[+!![]]
    ]()[
        +!![]+
        [!![]+!![]]
    ]
)+
(([]+[]+[]+[]+[]+[]+[]+[]+[]+[]))                                                                                       // Padding to 4321 characters

Naruyoko · Accepted Answer · 2019-07-18 03:54:51Z

0

JavaScript (Node.js), programmer5000

null

! > Will cause an error "TypeError: Cannot read property 'constructor' of null".

undefined also works.

answered Jul 18, 2019 at 3:54

Naruyoko

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