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Wrong result? #100

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kamil-kielczewski opened this issue Aug 23, 2020 · 3 comments
Open

Wrong result? #100

kamil-kielczewski opened this issue Aug 23, 2020 · 3 comments

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@kamil-kielczewski
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kamil-kielczewski commented Aug 23, 2020

In http://www.jsfuck.com/ I type this source A:

[1,2][1]

and select "Eval source" and push "Encode" button.

I get source B (long - I put it at the bottom of this post)

When I paste source A to chrome console I get result: 2
When I paste source B to chrome console I get result: undefined

It look's like it is bug or I do something wrong... - what to do?
(without "Eval source" problem is the same)

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@kamil-kielczewski
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I also want to ADD that in jsfuck it is possible to write [1,2][1] as follows (I use concat to put elements to array):

[]['concat'](1)['concat'](2)[1]

and after change each nontrivial character we get it in full (expected) form (details here)

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

which works as expected in chrome console

@hazzik
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hazzik commented Aug 24, 2020

@kamil-kielczewski this is because "eval source" wraps code into function() { ... CODE }:

function anonymous() {
[1,2][1]
}

So, to get the 2 you need to encode return [1,2][1]. The code you're getting is long but correct.

Also, jsfuck.com is outdated and if you clone source and play with index.html there, it will generate 1786 characters long code for you as opposite to 20405 on jsfuck.com.

@kamil-kielczewski
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kamil-kielczewski commented Aug 24, 2020

@hazzik Thank you for your answer :) - may be it is good idea to publish this site using github pages it is very easy to do - here I fork this repo to my github account and publish master branch using 2 clicks (i go to menu>settings>Github pages and choose master branch): https://kamil-kielczewski.github.io/jsfuck/index.html

It is also possible to redirect /jon domain http://www.jsfuck.com/ to such github page in easy way

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