Code to run arbitrary JavaScript code as a string, using only the characters []$=()-+~""!_

ABCD.js

[][$___=(($=(({}+"")))[$__=-~-~-~-~-~[]]+$[-~[]]+(""[+[]]+"")[-~[]]+(![]+"")[-~-~-~[]]+(($_=(!""+"")))[+[]]+$_[-~[]]+$_[-~-~[]]+$[$__]+$_[+[]]+$[-~[]]+$_[-~[]])][$___](($$=($_____=(!""+"")[-~[]]+(!""+"")[-~-~-~[]]+(!""+"")[+[]]+(!""+"")[-~-~[]]+(!""+"")[-~[]]+(""[+[]]+"")[-~[]]
)+"[][$___][$___]('"+$_____+"\"\\"+(""[+[]]+"")[+[]]
+(+[])+(+[]))+($$$=""+(-~-~-~-~[])+(-~[]))+($$$$="\"')()"))()+[][$___][$___]($$+($$$=-~$$$)+$$$$)()+[][$___][$___]($$+($$$=-~$$$)+$$$$)()+[][$___][$___]($$+($$$=-~$$$)+$$$$)()

annotated.js

// The code just constructs the string 'constructor' from the primitives '[object Object]',
// 'true', 'false', and 'undefined' and then uses it to access the Function constructor of
// the built-in Array type
[]['constructor']['constructor']("//Insert arbitrary code here")();

gistfile1.js

[][$___=(($=(({}+"")))[$__=-~-~-~-~-~[]]+$[-~[]]+(""[+[]]+"")[-~[]]+(![]+"")[-~-~-~[]]+(($_=(!""+"")))[+[]]+$_[-~[]]+$_[-~-~[]]+$[$__]+$_[+[]]+$[-~[]]+$_[-~[]])][$___]("// Insert arbitrary code here")()

return4.js

[][$___=(($=(({}+"")))[$__=-~-~-~-~-~[]]+$[-~[]]+(""[+[]]+"")[-~[]]+(![]+"")[-~-~-~[]]+(($_=(!""+"")))[+[]]+$_[-~[]]+$_[-~-~[]]+$[$__]+$_[+[]]+$[-~[]]+$_[-~[]])][$___]($_____+(___$=[][$___][$___]("_$_$",($_____=(!""+"")[-~[]]+(!""+"")[-~-~-~[]]+(!""+"")[+[]]+(!""+"")[-~-~[]]+(!""+"")[-~[]]+(""[+[]]+"")[-~[]]
)+'[][$___][$___]($_____+"\'\\\\'+(''[+[]]+'')[+[]]+'"+_$_$+"\';")();'))(""+(+[])+(+[])+(-~-~[])+(+[]))+___$(""+(+[])+(+[])+(-~-~-~[])+(-~-~-~-~[])))()

UnicodeToCharacter.js

(___$=[][$___][$___]("_$_$",($_____=(!""+"")[-~[]]+(!""+"")[-~-~-~[]]+(!""+"")[+[]]+(!""+"")[-~-~[]]+(!""+"")[-~[]]+(""[+[]]+"")[-~[]]
)+'[][$___][$___]($_____+"\'\\\\'+(''[+[]]+'')[+[]]+'"+_$_$+"\';")();'))(""+(+[])+(+[])+(-~-~[])+(+[]))

I decided to see if I could write something to execute more arbitrary code than in the original article on Hacker News at http://adamcecc.blogspot.com/2011/01/javascript.html