Characters in function

[837951602]

' ' in All env. turns into (+(+!![]+[+([][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[!![]+!![]+!![]]+(!![]+[])[+!![]]]+[])[+[]]])+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[!![]+!![]+!![]]+(!![]+[])[+!![]]])[+!![]+[+!![]]] where a simple NaN is encoded as (+(+!![]+[+([][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[!![]+!![]+!![]]+(!![]+[])[+!![]]]+[])[+[]]])) (+'1NaN'). I temporary locally fixed it by changing defineFHCharAt('ANY_FUNCTION', 8), to define('(NaN + FILTER)[11]'), and get space to (+[![]]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[!![]+!![]+!![]]+(!![]+[])[+!![]]])[+!![]+[+!![]]], but that just skip the problem

[837951602]

[].filter[([]+[].filter)[3]+(true+[].filter)[10]+'n'+'s'+'t'+'r'+'u'+([]+[].filter)[3]+'t'+(true+[].filter)[10]+'r'] [][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[!![]+!![]+!![]]+(!![]+[])[+!![]]][([]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[!![]+!![]+!![]]+(!![]+[])[+!![]]])[!![]+!![]+!![]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[!![]+!![]+!![]]+(!![]+[])[+!![]]])[+!![]+[+[]]]+([][[]]+[])[+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+([]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[!![]+!![]+!![]]+(!![]+[])[+!![]]])[!![]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[!![]+!![]+!![]]+(!![]+[])[+!![]]])[+!![]+[+[]]]+(!![]+[])[+!![]]]

[].filter.constructor [][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[!![]+!![]+!![]]+(!![]+[])[+!![]]][(+(+!![]+[+([][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[!![]+!![]+!![]]+(!![]+[])[+!![]]]+[])[+[]]])+[!![]]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[!![]+!![]+!![]]+(!![]+[])[+!![]]])[+!![]+[+[]]]+(!!(+([][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[!![]+!![]+!![]]+(!![]+[])[+!![]]]+[])[+[]]+!![])+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[!![]+!![]+!![]]+(!![]+[])[+!![]]])[+!![]+[+!![]]]+([][[]]+[])[+!![]]+(![]+[])[!![]+!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[+!![]]+([][[]]+[])[+[]]+(+(+!![]+[+([][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[!![]+!![]+!![]]+(!![]+[])[+!![]]]+[])[+[]]])+[!![]]+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[!![]+!![]+!![]]+(!![]+[])[+!![]]])[+!![]+[+[]]]+(!![]+[])[+[]]+(!!(+([][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[!![]+!![]+!![]]+(!![]+[])[+!![]]]+[])[+[]]+!![])+[][(![]+[])[+[]]+([![]]+[][[]])[+!![]+[+[]]]+(![]+[])[!![]+!![]]+(!![]+[])[+[]]+(!![]+[])[!![]+!![]+!![]]+(!![]+[])[+!![]]])[+!![]+[+!![]]]+(!![]+[])[+!![]]]

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

[fasttime]

Kudos for seeing this! What appears to be a simple NaN is actually an engine-sensitive padding expression (FHP_3_NO): it evaluates to 10 (2 chars) in Internet Explorer and to NaN (3 chars) in other browsers. It is required to compensate for an additional character that IE inserts before the text "function filter () {", so that the white space we want to extract is aligned at the same position in all engines. This is only used when compatibility for both IE and other engines is required.

[837951602]

Ok I understand. Thank you!

[837951602]

And I found that (+([].filter+[])[0]+[].filter)[22] costs 283<286 chars and get ' ' on both ie and opera

[837951602]

I have only IE8 where [].filter is undefined, so I Array.prototype.filter='\nfunction filter() {\n [native code]\n}'ed

[837951602]

(+(1+(true+[].filter)[30]+7)+[].filter)[33] costs 357<360 'v' (+(1+[(true+[].filter)[40]]+0+0+0+0+0)+[].filter)[31] 348(for what use 1(e)00001 instead of 1(e)0000?)

[fasttime]

It's true that there is no feature to optimize for both IE and V8 style function source but not for Firefox/Safari. I'll have to work on this.

[fasttime]

for what use 1(e)00001 instead of 1(e)0000?

@837951602 What you are seeing is the result of another engine-sensitive expression (FBP_7_NO). It produces results of different lengths when evaluated in IE, Chrome or Firefox, and it's used to align characters in "[native function]" at the same position in different engines.

[837951602]

I see. So 1(e/]/)00001 generates 10/100001/NaN but what about 10(e/]/)0000?

[fasttime]

@837951602 Great catch! Would you like to submit a pull request?

The file you have to change is src/lib/definitions.js. The new definitions would look like define('+("10" + [(RP_4_N + FILTER)[40]] + 0 + 0 + 0 + 0 + 0)'). We can chat on Gitter if you need help: https://gitter.im/fasttime/JScrewIt

[837951602]

Submitted at https://github.com/fasttime/JScrewIt/pull/7/commits/1cafe4454d6f2b1b12bc2459fa71773b1c13132e

[837951602]

(+("1000"+(false+[].filter+0)[40]+0+0+0)+[].filter)[40] 360<363 ']' can write a FBP_8_NO: [ define('+("1000" + (RP_5_N + FILTER + 0)[40] + 0 + 0 + 0)'), define('+("1000" + (FILL + 0)[33] + 0 + 0 + 0)', FILL), ] but how to rewrite the ']'? For 'D'(escape(']'/'}')[2]), we don't care whether it's a ']' or a '}', so a FBP_6/8_NO? what should it be named? FBP_6/8_NO: [ define('+("10" + (RP_5_N + FILTER + 0)[40] + 0 + 0 + 0)'), define('+("10" + (FILL + 0)[33] + 0 + 0 + 0)', FILL), ]

[fasttime]

This looks interesting! Yes, we can write a FBP_8_NO. This should be referenced in FB_PADDINGS (as element # 8) in place of RP_1_NO + [FBP_7_NO], then it should be used automatically in the definitions. As about 'D', if we only need that expression in one place we can inline it in the definition (no need for an extra constant). @837951602 Would you like to try doing this?

[837951602]

Is adding define('escape((+("10"+(RP_5_N+FILTER+0)[40]+0+0+0)+FILTER)[40])[2]'), define('escape((NaN+(+("10"+([].fill+0)[33]+0+0+0)+FILL))[41])[2]', FILL), enough?

[fasttime]

@837951602 Maybe yes, but maybe other older definitions are not needed any more and can be removed after this update. The only way to tell for sure is running gulp full and see in output.txt if there are unused definitions.

[837951602]

Why did we use +0+0+0+0+0 in FBP_7_NO instead of +'00000' (both the same length of 30, +(+[])+(+[])+(+[])+(+[])+(+[]) and +(+[]+[+[]]+(+[])+(+[])+(+[]))

[fasttime]

True, those are both the same length. I don't see a particular reason to choose one style or another.

[fasttime]

Done

[837951602]

Why is it a RP_6_SO: '"0false"'(+[]+[![]]), not a RP_6_S: '"false0"'(![]+[+[]]) or RP_6_S: '"0false"'([+[]]+![])?

[fasttime]

RP_6_SO is just +[]+[![]]. The O in the name is there because there are two plus signs not inside brackets. The alternatives are actually the same length, except that they only have one plus sign out of brackets (because the + in [+[]] is inside the square brackets).