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POHow can I say "love" without character or digits in JavaScript?
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copied!<p>Inspired by Ryan Barnett's PPT of BlackHat DC 2011, especially the code below:</p> <pre><code>($=[$=[]][(__=!$+$)[_=-~-~-~$]+({}+$)[_/_]+ ($$=($_=!''+$)[_/_]+$_[+$])])()[__[_/_]+__ [_+~$]+$_[_]+$$](_/_) </code></pre> <p>Yesterday was special day for lovers, so I tried to write something similar. Which basically alert "I love you" without any character or digits.</p> <p>e.g. "I" can be obtained from <code>((_=-~[])/--_+[])[_]</code></p> <p>we have "[object Object]", "true", "false", "NaN", "Infinity" to use, I cannot figure out a way to get "v" this way.</p> <p>I tried to think of <code>String.fromCharCode()</code>, (Ryan already get <code>window</code> reference for us, so in theory, we can <code>window["String"]["fromCharCode"](118)</code>) however I miss "S" and "C" character here. Also think about <code>window["eval"](...)</code>, again, I have no "v".</p> <p>Just try to explain a little bit, <code>[]</code> is empty, when apply <code>+/-/~</code> operate to it, it converts to number <code>0</code>, and <code>~[]</code> gives <code>1</code>, <code>1/0</code> gives <code>Infinitey</code>. Then it comes to <code>1/0 + []</code>, they will both converted to string for the add, which gives <code>"Infinity"</code>, and <code>"Infinity"[_] == "Infinity"[0] == "I"</code>...</p> <p>The original code of Ryan is more complex, it utilized a lot more, includes scope, special return value, etc. (this is another story)</p> <p>This might not seem to be a great idea to do things, but just very interesting.</p> <p>With help with meze, I was able to produce this for Firefox:</p> <pre><code>($=($=[$=[]][(__=!$+$)[_=-~-~-~$]+(_$={}+$)[_/_]+ ($$=($_=!''+$)[_/_]+$_[+$])])())[__[_/_]+__ [_+~$]+$_[_]+$$]((_$_=(__$=-~[])/--__$+[])[__$]+_$[_+++_]+__[__$=-~-~[]]+_$[-~[]]+($[_$[$__=_+_]+_$[++$__]+_$[++$__]+_$[++$__]+_$[++$__]+_$[++$__]]+[])[ $__+$__+--_]+__[++_]+_$[$__=_+--_]+_$_[_+++_]+_$[_/_]+$_[__$]); </code></pre> <p>it basically is <code>alert("I love you")</code>, many thanks! If only I get the help yesterday, which I have not post this yet :(</p> <p>JavaScript is beautiful, some varibles for your reference:</p> <pre><code>$_ = "true" __ = "false" _$ = "[object Object]" $$ = "rt" _$_ = "Infinity" _ = 3 = 4 = 3 = 4 = 3 $ = window $__ = 8 = 13 __$ = 0 = 2 </code></pre> <p>Some variables are reused many times, will not try to leave details, it is not a fun job :) I am happy, we are finally here! This actually has lots of potential, as we now have "v", and lots of digits, we will in theory possible to <code>eval()</code> lots of... things easier. I will show this to my wife, hope she enjoys the _$-+()...</p> <p>example as your reference: <a href="http://jsfiddle.net/Y4wqw/">http://jsfiddle.net/Y4wqw/</a></p> <p>btw, we can shorten the code a bit, as we already have reference to <code>sort()</code>, which can be used instead of window["Object"] to get the "native code" => "v", here it is: </p> <pre><code>($=($_$=($=[$=[]][(__=!$+$)[_=-~-~-~$]+(_$={}+$)[_/_]+ ($$=($_=!''+$)[_/_]+$_[+$])]))())[__[_/_]+__ [_+~$]+$_[_]+$$]((_$_=(__$=-~[])/--__$+[])[__$]+_$[_+++_]+__[__$=-~-~[]]+_$[-~[]]+($_$+[])[(__$<<__$<<__$)-_+~[]]+$_[--_]+_$[$__=_+++_]+_$_[_+--_]+_$[_/_]+$_[__$]); </code></pre> <p>Again, it works only in Firefox, might not try to migrate to other browser. And I love Firefox.</p>

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