@MartinBüttner I have lost partially finished code in the online CJam interpreter by not properly clicking in the text box before just hitting backspace. It backs out of the page, and with some browsers the content is gone if you go forward again.

@RetoKoradi for me it's only gone if I had opened it via a permalink

honestly, I'd rather lose CJam code than an explanation... it's fewer keystrokes to reproduce it...

^ this is epic

@MartinBüttner At least with the browser I have now, it's still there. Yes, fewer keystrokes, but they sometimes take me a while... I lost a finished answer once when StackOverflow went down (for maintenance?). I was not happy.

phew, typed it all up again

the final GolfScript code is pretty sweet actually... that 7/{))}% worked was really lucky coincidence

Ain't block concatenation neat?

Martin, do you not think it's rather perverse to use CJam for the program which is allowed to use . and GolfScript for the program which is allowed to use _?

:D If CJam had a way to eval without access to ~ I might consider switching ;)

@aditsu ^ this is a serious limitation for restricted-source challenges

@Dennis any plans for posting Primes? Friday?

@MartinBüttner For CJam, you can use ll|(2(|(0$N&"~""@@"((|~\.

I think.

does l read newlines?

On EOF, l pushes \n.

oh

So you get "c\n" for c and "\n" for \n.

Trailing linefeeds may be inconsistent though. Let me check.

yes they are

Yes, the output for ~ is ~\n, but the output for \n is ~ (no LF). Not very clean.

No problem. Append a ~.

Still saves a byte.

ah, neat

I'll change that tomorrow... can't be bothered to fix the explanation now.

Also, 2( is X.

oh, right

@MartinBüttner With 5 new answers in the last 24 hours, "Hello World" still seems pretty active. Let's see if activity lessens after Sp3000's bounty expires.

Also, has not received enough attention? Really?

sup

@Dennis true, although I was considering offering one myself :P

Not going to let it quiet down just yet?

no one has attempted Wierd yet...

23 bytes: ll|(\,|0$N&"~""@@("((|~

although I will probably just offer bounties on it every now and then for interesting esolangs, so don't let that stop you from posting primes

@MartinBüttner And I haven't posted my Mascarpone one. I should get on to that.

@PeterTaylor might as well do Emmental while you're at it ;)

@MartinBüttner "~"l(X|||$X< (12 bytes) It will exit with an error for LF, but the output will be correct.

:D

Wait. I think I'm missing something.

@MartinBüttner I'm not sure that Emmental is all that similar to Mascarpone.

oh okay, I don't know anything about Mascarpone except that it's considered a successor to Emmental (at least that's what I remember)

@MartinBüttner Yes, I forgot to decrement. "~"l(X|(@@& (11 bytes)

I've made so much progress on my new language, I'm impressed with myself.

It still only does multiplication and addition, but it does it better.

Is there a wrong way? :P

@PhiNotPi I'm using this to teach me how to make an interpreter for a programming language.

To be more specific, much of my progress has been adding all of the organizational structure around performing operations, such as being able to handle operators with different arities and modifiers that modify the arity.

♫♫ Closing time ♫♫ You don't have to go home but you can't stay here ♫♫

♫♫ You can check in anytime you want ♫♫ But you can never leave ♫♫

♫♫ Welcome to the hotel California ♫♫ (Such a lovely place, such a lovely face) ♫♫

♫♫ % ♫♫

♫♫ Any time of year ♫♫ You can find me here ♫♫

sorry... your line just made me think of this song, and i love this song=)

@AlexA. HI

@PhiNotPi This is a much better song than Hotel California.

@flawr HELLO

@AlexA. Do you have a favourite song at the moment?

Favorite song at the moment? Hmm... It's a toss-up between Atlas Novus and Attitute City.

Subject to change though, as it is in fact "at the moment." :P

Sounds good, never heard of those.

Why not both.

GOOD GOD

some bands sound like there are multiple bands playing at once

@Dennis Not enough Hello Worlds, need even more :P

@flawr I used to love bands like that. Haven't listened to them much lately though. Hadn't heard of Portal.

@AlexA. I still do, too, but I cannot listen to those for more than an hour at once=)

Have you ever wanted to sort cat pictures by the cat's colours? on commons.wikimedia you can!

@flawr There's a challenge idea!

Maybe a bit too difficult.

@flawr It should make you think of this

^ Obviously the correct answer. :P

@Zgarb I was actually trying to work out another challenge=)

@PeterTaylor I think I still prefer Portal over that=)

@Zgarb Reminded me of this: parkorbird.flickr.com

Actually I was thinking of a popularity-contest where participants should make a program that tries to replicate an input image with the seven 'tans' (pieces) of the tangram:

Okay, that sounds cool.

But I think for a general (even if only black and white) image that is way to difficult.

I thought of only allowing 'easy' pictograms as input but this is still too difficult I think.

@MartinBüttner is the 5K privilege secret or something?

I just got it, but before this, it wasn't even in the list

@Maltysen It's new

As in <24 hours ago new

ahh

Like a newborn baby except less disgusting.

It's new exactly in the way a great-grandfather isn't.

It's on all SE sites. I just got it on SO last night.

@flawr What if you allow the pieces to overlap?

I think this is still too difficult (at least for producing something meaningful)

@Doorknob Your great grandfather is more than 24 hours old?

@AlexA. I think so, yes.

@AlexA. To the best of my knowledge, yes...

@Zgarb How about reducing it to just solved or unsolved tangrams?

Of course, I don't know his exact age, so I can't be positive.

If my great-grandfather is younger than me, though, I think I have bigger problems

@Zgarb That means you basically have to 'approximatively' solve a tangram.

@Zgarb and as it is a popularity challenge people who vote can actually decide how well your program does the job, what you think about that?

That could work.

One voting criterion should be execution speed, so that brute forcing is not a good strategy.

@flawr Would it work if you allow the code to choose the cuts? So it slices the square into pieces using a defined limited number of cuts, and then uses those pieces to construct the image. This allows tailoring the pieces to the input image

@trichoplax That is indeed a very interesting idea too.

You could either say cut 10 times then move, or allow cutting and moving in whatever order you wish.

@trichoplax Why does it matter in what order you cut/move?

The second way you could cut in half, rearrange, cut again, and obtain shapes that wouldn't be reachable with only 10 cuts of a static square

At least I think so

So you basically mean each time you make an 'infinite' cut throu all the pieces?

yes

but if you want to cut through just one piece the second way allows you to move pieces out of the way

Ah ok, well I thought of a cut that just cuts one piece apart.

That's another option

I guess that way you can allow a larger number of cuts and still have it quite restrictive

So 3 to choose from now...

I think implementing your 'infinite cuts' with rearranging would already be quite difficult.

@flawr That option has the advantage that it corresponds more clearly to the original Tangram idea.

@trichoplax Wouldn't that be even more difficult than just using the tangram pieces? Many more degrees of freedom to optimize.

@Zgarb Which option?

@RetoKoradi That is exactly what I though, thanks=)

While I'm unhelpfully widening the problem, you could also use something other than a straight line cut. You could have a unit square and a unit circular cookie cutter. and be permitted 10 stamps with the cookie cutter to generate your pieces

@RetoKoradi Yes definitely :)

@RetoKoradi I guess you'd keep the limit on number of cuts very low in that case

@flawr Having cuts that cut only one piece in half.

@Zgarb Now I see what you mean, I like that thought!

I guess you could reduce the degrees of freedom when choosing your own cuts if the cuts are only permitted at multiples of 45 degrees

@trichoplax I'd like to stick with straight cuts.

@trichoplax Good idea!

@flawr Yes I was just thinking aloud - I do agree that keeping it simple will make for a more interesting competition

(We could still pass the number of cuts/pieces/whatever as another input)

Good point

Then the answers can display their best efforts for different numbers of cuts

Would the output be a new image, or some description of the cuts and piece positions like in here?

Totally new image I'd say.

But somehow I think I still prefer a challenge where everyone has the same set of pieces.

I like the tangrams version.

I definitely think images in the answers would be good for judging, but if you wanted to standardize it you could have a stack snippet that takes the descriptions of cuts and piece positions and generates a standard image

This way you don't have to check the code or outputs for validity

Good idea.

What are the original rules for a standard tangram? Are the pieces permitted to rotate and reflect, or only rotate, or just translate?

@trichoplax Mirroring is allowed, but there is only one piece where it really matters.

(The rhomboid)

Can the pieces be arranged at angles that are not multiples of 45 degrees? Do they have to touch along an edge or can they be detached or touching a vertex to an edge?

Usually you are given a shilouette (use google image search for 'tangram shilouette')

Any amount of rotation/translation/mirroring is allowed.

That can be any shape.

But many shapes do indeed have (almost) exclusively angles of 45 degrees.

Ah - so will the input be a reachable tangram silhouette, or will we be approximating arbitrary images?

I need to go now. Looking forward to seeing how the question turns out :)

I have to go too=)

@trichoplax I thought it would be funny to ask for a program that accepts a pixel image depicting a reachable tangram shilouette, but then feeding the program a few non-tangrams=)

I have to go to sleep now, perhaps until tomorrow=)

Just joined and posted on a new community: Blender. The site doesn't appear to have super high traffic so we'll see what happens.

Will it blend?

Hopefully

Not currently though since my project is crashing. :P