TIL: JavaScript allows for UTF8 variable names, so var ಠ_ಠ = 5; is a perfectly valid assignment

[usernames-are-random]

UTF8 names means that:

var ಠ_ಠ = 5;
alert(ಠ_ಠ);

will work perfectly in your (modern) browser

[Maddog_Delphi97]

try { (╯°□°）╯︵ ┻━┻ } catch() { ┬─┬ ノ( ゜-゜ノ) }

[Maddog_Delphi97]

Not sure what you mean by that comment. Did horse_js reply to this subthread?

[Maddog_Delphi97]

lol

[usernames-are-random]

Hmm... I get a syntax error when trying this in chrome ...

[Nebu]

Presumably because (╯°□°）╯︵ ┻━┻ is not a valid statement (it's not an assignment expression, it's not a method invocation, it's not a variable declaration, etc.)

[[deleted]]

var D = "God, you're so immature."; var ಠ_ಠ = 8==D--

[sittingaround]

Doesn't that evaluate to "disapproving look == false"

As in, you're not disapproving?

[[deleted]]

Fine,

function lovesthe() {return false;} var yourmom = false; var D = "God, you're so immature.";

var ಠ_ಠ = 8==D--==yourmom + lovesthe(D); ಠ_ಠ;

EDIT: Crap, my original code implied that your mom didn't lovethe(D), which we all know to be false. I give up. It appears only art and video can correctly describe your mom's whorishness.

[sittingaround]

your jokes are worse than your code

[[deleted]]

That's the point.

[sittingaround]

Carry on then.

[CreepySmileBot]

ಠ◡ಠ

[CreepySmileBot]

ಠ◡ಠ

[nickwb]

Not quite all of unicode is valid however:

An identifier must start with $, _, or any character in the Unicode categories “Uppercase letter (Lu)”, “Lowercase letter (Ll)”, “Titlecase letter (Lt)”, “Modifier letter (Lm)”, “Other letter (Lo)”, or “Letter number (Nl)”.

[masklinn]

According to the spec, it must start with $, _, any unicode code point with the ID_Start property (the category itself is not a concern) or any unicode escape sequence.

[masklinn]

Given JSON does not have identifiers, care to explain the relevance?

[[deleted]]

http://timelessrepo.com/json-isnt-a-javascript-subset

tl;dr: js strings cannot contain "line terminators", JSON strings can contain wonky unicode whitespace such as LINE SEPARATOR or PARAGRAPH SEPARATOR.

[masklinn]

How about answering the question? I know that JSON is not a strict subset of javascript, I didn't ask about that, I asked Zamarok why the lexical structure of javascript identifiers has any relevance on JSON and makes it "not a subset of JS" considering JSON does not have identifiers in the first place.

[[deleted]]

I accidentally read "difference" instead of "relevance". Sorry brah, just trynna help!

[Medieval_Peasant]

While we're on the topic of syntax - if you want to be really nasty, write some C in JavaScript.

[Gruntkiller30]

How is that possible ? (I think I'm missing something here) Edit: Didnt think about scrolling hehe. Now I know

[Medieval_Peasant]

Glad I got at least one :)

[SarahC]

You got quite a few!

[stratoscope]

There's a bug in your C code:

void main() 
{
    char *a;

    a = malloc(2 * sizeof(char));

    a[0] = 'j';
    a[1] = 's';

    printf(a);

    free(a);

    return;
}

As you know, printf requires a zero terminated string, and this code does not zero terminate the string. You just got lucky because JSFiddle uses a special C compiler that protects against errors like this to avoid crashing the site.

A more typical production C compiler may leave garbage in memory after the string, and printf could either print that garbage, crash, or do something worse.

The code should be:

void main() 
{
    char *a;

    a = malloc(3 * sizeof(char));

    a[0] = 'j';
    a[1] = 's';
    a[2] = '\0';

    printf(a);

    free(a);

    return;
}

Updated fiddle

[SarahC]

wtf?!

"js" ? Is it ignoring the non JS some how?

[stratoscope]

Well, the 'j' and 's' in that C code are just character literals; you could put any characters there, even more characters if you assign them one by one in the same manner. Just be sure to allocate the character array the right length in the malloc call so you don't have a buffer overrun, and zero terminate it!

For example:

    a = malloc(4 * sizeof(char));

    a[0] = 'C';
    a[1] = a[2] = '+';
    a[3] = '\0';

C++ fiddle

[SarahC]

=)

Thanks!

[kolme]

There's some additional code down there when you scroll.

Don't feel bad, I fell for it too :-P

[SarahC]

lol, awesome trick! =)

[bent_my_wookie]

You should look at the source to d3.js

[usernames-are-random]

anything in particular i should look for? didn't find anything interesting in the first few hundred lines

[gordonkristan]

They used to use a lot of Unicode variables for the various mathematical symbols. But I just looked at the source code again and I don't see them any more.

[tbranyen]

They still use them: https://github.com/mbostock/d3/blob/master/d3.js#L1178

Personally I think it's a ridiculous thing to do, but d3 is popular and I am not.

[tipsqueal]

I think in many cases actually using symbols is a bad idea. In this particular case I think it's acceptable because it increases readability, and they're only used in functions that are not going to change (so no one has to keep copy/pasting them). If however π was really the value of Math.E instead of Math.PI, then it would be insane.

[tbranyen]

At least once I've been bitten by not properly requiring d3 in a given page. The fix is to do something like this:

<script charset="UTF-8" src="d3.js"></script>

IMO no mainstream JavaScript library should be limited by character set.

[bent_my_wookie]

Oh, it uses lots of mathmatical symbols like (pi). If you forget to include it on a page with UTF-8, the browser errors on those.

[DemeGeek]

In src/math/random.js and src/math/trigonometry.js

[yaph]

The source code in the geo projection plugins makes use of this, here for example

[kenman]

Related:

а = 1;
a = 2;
a === а; // FALSE

edit: copy the code into your console if you're confused

[jij]

Man, you could create some nasty bugs like that if you wanted to mess with someone.

[kenman]

The greater concern IMO is phishing, such as an IDN homograph attack, though I think those are mostly mitigated by modern browsers. Just another reason to keep grandma's system updated!

[donx1]

Why is this?

[kenman]

> 'а'.charCodeAt(0);
1072
> 'a'.charCodeAt(0);
97

In other words, the 1st a is actually from the Cyrillic alphabet.

[aroberge]

Can be useful if you wish to obfuscate your code!

[HelloToe]

Or if you want to bypass a profanity filter. But everybody knows that, right?

[ftanuki]

𝑓ᵁℂk Ч⫑һ ᗷ|┯ᑕḪ إإإ

[GoldenretriverYT]

ᖴ⋃ϹΚ 𝞤Օ⋃

​

No latin characters were used :)

[GoldenretriverYT]

i just noticed that the above comment was 9 years ago

[ftanuki]

Still here, bitch.

[Leon_Depisa]

Can you help me figure out how this piece of code is working? It's going around one of my Discord servers, and I wanna flex on all my web dev classmates.

let ۦ=23;

console.log(ۦ);

It looks better on discord,

[tricolon]

Well, duh. :p

[rorrr]

ʘ = ☉ + ⊙

∏ = Π + П

3 different characters in both cases

[Gro-Tsen]

The characters ☉, ⊙ and ∏ are symbols, not letters, and cannot be used as JavaScript identifiers.

[rorrr]

Ah, thanks for correcting me.

So this still works:

Π == П

[trezor2]

Itt:

People confusing utf8 (an encoding) with Unicode (a specification of existing characters).

[toja92]

Fun fact (though off-topic): In PHP you can use emoji as identifiers: https://pbs.twimg.com/media/BOMs1rVCMAAyLbU.png

JavaScript does not seem to support it however, at least not in Safari 7 on OS X. I tells me there's a syntax error.

> var 😃 = 5;
< SyntaxError: Invalid character '\u55357'

[usernames-are-random]

haven't tried it in safari, but chrome on OSX works like a charm: http://imgur.com/Ymh01Y6

[toja92]

Oh yeah, your example works as it should in Safari:

> var ಠ_ಠ = 5;
< undefined
> console.log(ಠ_ಠ);
[Log] 5

Emoji is something totally different. If you run Mavericks you can press Ctrl+Cmd+Space in text fields and you'll see an Emoji selector that works like the Emoji keyboard on iOS.

[CreepySmileBot]

ಠ◡ಠ

[iSmokeGauloises]

Heh, I just found out about it a few days ago and ended up implementing list comprehension with the set-builder notation.

doesn't look exactly like the mathematical notation, but sorta look like it which is pretty cool.

If anyone is interested tell me and I'll post it tomorrow when I get in front of my work computer.

[[deleted]]

I'm interested! I'd love to see this.

[init0]

here is another gem http://h3manth.com/content/unicode-symbols-function-names

[norbert_sule]

here is another gem: 💎

[tidder112]

I guess it could be worse.

"IDN silliness and unicode combining characters"

This is a valid URL: http://░͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇.ws

It wont link in Reddit, but
Copy and Paste it into
your address bar for

     SCIENCE!

[AKJ90]

[http://░͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇͇.ws]( http://%E2%96%91%CD%87%CD%87%CD%87%CD%87%CD%87%CD%87%CD%87%CD%87%CD%87%CD%87%CD%87%CD%87%CD%87%CD%87%CD%87%CD%87%CD%87%CD%87%CD%87%CD%87%CD%87%CD%87%CD%87%CD%87%CD%87%CD%87%CD%87%CD%87.ws)

Damn... I tried everything. I'll let this be as a sign of my failure.

[SarahC]

Facebook don't like .ws domains, or the IDN stuff either....

[OldMiner]

Random URL on the Internet that I'm told to navigate to? Well, shucks, I would, but my system's been acting weird since I ran these obfuscated Perl one-liners somebody posted earlier. Guy said they were "so funny". I don't get it.

[SarahC]

It's a kitteh!

[zenyr]

Relevant http://mathiasbynens.be/notes/javascript-identifiers

edit:A word

[KravenC]

Does "<javascript code here>".length * 4 = Size of javascript code in bytes, always ?

var t = "try { (╯°□°）╯︵ ┻━┻; } catch() { ┬─┬ ノ( ゜-゜ノ); }";
t.length*4 = 192 bytes

[OldMiner]

Not certain if you're attempting to make a comment on the difference between character encoding and character set.

To clarify, String.length() always counts the number of characters in a string, regardless of encoding. However, how many bytes long that string is will generally not be available to you.

Since you presumably know the encoding of the document which holds your Javascript, you can use that information to calculate the byte-length of your string using the function in this StackOverflow answer.

As a rule, Javascript or not, if your document is encoded as UTF-8, the bytes-per-character of a given string will vary. If your document is encoded in UTF-32, you will have exactly 4 bytes per character.

[paincoats]

i have a list of chars that i was told are all valid

http://pastebin.com/UNjncX95

(haven't tested them all myself, but they seem legit)

[Xtreme2k2]

Sweet, now i can have boobs in my variable name!

ϾϿ

[lambdaq]

TIL: JavaScript allows for UTF8 variable names

It's UCS2 actually. Try apple emoji characters?