Dwitter - javascript demos in 140 characters

function u(t) {

c.width=1920 // clear the canvas
for(i=0;i<9;i++)
x.fillRect(400+i*100+S(t)*300,400,50,200) // draw 50x200 rects

} // 122/140

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    u(t) is called 60 times per second.
    t: Elapsed time in seconds.
    S: Shorthand for Math.sin.
    C: Shorthand for Math.cos.
    T: Shorthand for Math.tan.
    R: Function that generates rgba-strings, usage ex.: R(255, 255, 255, 0.5)
    c: A 1920x1080 canvas.
    x: A 2D context for that canvas.

Try the new frontend: beta.dwitter.net
Current theme challenge: #Food

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katkip

function u(t) {

t||(c.width=90);for(i=90;i>t;x.fillStyle=
R(i*i,200/i ,9*i),i--) x.fillRect(t+(i>>
2-t)*t,t+(i>>i*3)*t
- S(i*i)*(i-t),1,.24)

May 13 2020 7:16 AM UTC

}// 124/140

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it's amazing to see an AI creating a working dweet. Epoch 30/50

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joeytwiddle

remix of d/18737 by u/tomxor

function u(t) {

D=[5,4,7]
g=(n=3,s='')=>n?[...'X012345*/+-&|^~'].map(c=>g(n-1,s+c)):q(s)
q=E=>{try{D.every((Y,X)=>Y==eval(E))&&(S=E)}catch{}}
t||g();throw S

May 15 2020 5:51 AM UTC

}// 140/140

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Expression Miner (bruteforce)

u/joeytwiddle

Unfortunately I couldn't use alert(S) so I had to drop some numbers!
u/joeytwiddle

Tryn=4 and either D=[1,3,7] or D=[1,1,4,27] #unimproved
u/joeytwiddle

Rather than searching, it might be more productive to display/draw some of the unusual small expressions, so we can look for ways to use them in future

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KilledByAPixel

remix of d/18718 by u/KilledByAPixel

function u(t) {

eval(unescape(escape`𩡯𬠨𪰽𪐽𞐵𝰻𪐭𛐻𮀮𩡩𫁬𤡥𨱴𚁱🰰𞡫𚰲𚡲𚠨𫐥𝀭𜐮𝰩𛀷𝀰𚱲𛁱🱲🐱𩐸𞡲𛁱🱲𞠭𫐥𝰪𬠭𬠩𚑲👩🁫𛐲🰲𩐷𛱩𛱩𞠭𝱥𝐬𬐽𪐥𜠬𮀮𩡩𫁬𤱴𮑬𩐽𨁨𬱬𚀤𮱱🰭𬠯𝠺𫠽𪐫𭀪𜐲𜁽𘀤𮱱🱫𞠲𞑽𙐤𮱲🠰🱩𛰨𫠥𜠪𚠨𜰫𫐥𜰩🀱🰴𞐺𜐲𚐺𝠹𯐥𨀬𫐽𫠾🠵`.replace(/u../g,'')))

May 11 2020 3:00 AM UTC

}// 140/140

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City Limits 🌆

u/Xen

nice!
u/KilledByAPixel

#city #d3

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tomxor

remix of d/18733 by u/joeytwiddle

function u(t) {

D=[5,4,3]
for(i=1e3;i;E=i--%8?E+'X0123456789*/+-&|^~'[(i^i*t)%19]:'')try{D.every((Y,X)=>Y==eval(E))&&(S[E]=1)}catch{}throw Object.keys(S)+E

May 12 2020 11:17 AM UTC

}// 139/140

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Expression Miner #improved

Show more comments…
u/tomxor

1k tests per frame + variable length + deterministic + keeps solution set
u/tomxor

... +4 chars :P
u/tomxor

Struggling to get it to find anything non linear though e.g D=[0,1,2,4,8]
u/tomxor

#fuzzing
u/joeytwiddle

Great, usable! Off of dwitter, this one generates valid syntax from a grammar: https://github.com/joeytwiddle/dweets-dev/bl…
u/tomxor

Interesting. I once wrote an n-card "24 game" solver which is similar but far more limited in terms of operators - by far the most significant optimization i could find was to combinations based on subexpressions that are equivalent to one already traversed i.e nodes in your AST - maybe that could be applied to yours as well?
u/tomxor

* to prune combinations
u/tomxor

oh and the other fairly decent optimization was pruning combinations based on commutativity of binary operators... i.e another kind of equivalence
u/tomxor

I should clarify: to by pruning I mean not mearly skipping evaluation of individual permutations but to be able to skip entire subtrees of permutations by detecting equivalence at the root of that subtree.
u/joeytwiddle

Pruning does sound sensible, but I'm not sure how to approach it.
u/joeytwiddle

I am also having difficultly with >3 non-trivial outputs. I think the search space is too large. But at least I found some simplifications, such as: [1,3,5,7] => X-~X
u/tomxor

Finally got it to solve a non linear one: D=[2,3,6,11,18,27] (2+X*X), just need a bit more patience

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taupelink

remix of d/18768 by u/taupelink

function u(t) {

f=(X,Y)=>Y?f(Y,X%Y):X;for(i=1e3;i--;){z=Math.random()*3e6|0;g=f(a=z%1920,b=z/1920|0);if(g>5){x.fillStyle=R(0,g,1280/g);x.fillRect(a,b,2,2)}}

May 13 2020 11:27 PM UTC

}// 140/140

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d/18769

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katkip

function u(t) {

eval(unescape(escape`𩡯𬠨𪐽𨠽𜐳𜠭𭀪𭀻𪐭𛐾𜀻𚑡👴𚱩𛁸𛡦𪑬𫁓𭁹𫁥👒𚁩𙐳𚡢𛁩𙐳𚡢𚰶𝠬𭰽𛠵𚱃𚁡𚠽𜠩𛰳𛀮𜠩𛁸𛡦𪑬𫁒𩑣𭀨𛠮𛡺👛𞐶𜀫𚁘🐶𜀰𚡔𚁴𛑩𛰴𜠩𚐪𤰨𭀩𚠱𛀶𜀪𭀫𚁢𛑘𚡘𛰱𩐳𚐪𤰨𨐯𝐩𛁷𚠽𨠬𭱝𚐬𮀮𫁩𫡥𥱩𩁴𪀽𛠱𛁸𛡳𭁲𫱫𩑒𩑣𭀨𛠮𛡺𚐠`.replace(/uD./g,'')));

May 13 2020 8:00 AM UTC

}// 139/140

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katkip

remix of d/18738 by u/katkip

function u(t) {

for(c.width|=i=c.width=99;i--;)x.fillRect(C(a+=**i*i/799);x.fillRect(960+**20,2*S(t),r/9,9.1)*200,400,is/2,199*C(a)9,540+S(t))

May 13 2020 7:07 AM UTC

}// 126/140

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AI generated dweet. Epoch 20/50

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u/katkip

AI generated dweet. Epoch 22/50
u/katkip

x.fillRect(i056+S(t)-1)*z2*20)*w/tilpate(C(pidal(C(+%))nne(+dillRect(li00/%mi,=id34+rXS(jXa)Fb/5)x[f='ff]:+1w)+)${qx.5)for(j==j0=j2j5y=(<=1j1-5)
u/katkip

AI generated dweet. Epoch 25/50
u/katkip

for(i=0;i<3e3;i+=2e3))for(=0;j)*S(T)*C(-t)),i=3e3,i,x.fillRect(X*60,Y**C(a),540+r**(=0))x.fillStyle=R((i=c.width|=0,:,){x.lineTo(i*.1);x.stroke();
u/katkip

AI generated dweet. Epoch 26/60
u/katkip

/&,x.fillRect(0,0,i=*C(C((*(ijin*f*6),a/2+(k(ai)+=i=>(i%*3,wbw,+15)),=(3,+w&q,x.fillRect(n%*+1,5,*+w0,w=*3,a?5:0,.5)

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mattaustin

function u(t) {

eval(unescape(escape`𬰽嵮𭀥𜠻𒡩𩠨𭁨𪑳𛡬𘐽𬰩𮱴𪁩𬰮𫀽𬰊𭱩𭁨𚀨𫡥𭰠𠑵𩁩𫱃𫱮𭁥𮁴𚀩𚐮𨱲𩑡𭁥𣱳𨱩𫁬𨑴𫱲𚀩𚑣𫱮𫡥𨱴𚁣𫱮𭁥𮁴𛡤𩑳𭁩𫡡𭁩𫱮𚐬𬱴𨑲𭀨𚐬𬱴𫱰𚀮𜀸𚐬𮀮𩡯𫡴🐢𝐰𬁸𘁡𘠻𮀮𩡩𫁬𥁥𮁴𚀢𧁵𜠷𝠴𘠬𞐹𛀹𞐩𞱩𩠨𬰩𨰮𭱩𩁴𪀽𝐰𜁽`.replace(/u../g,'')))

May 13 2020 6:05 AM UTC

}// 135/140

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Beep

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katkip

remix of d/18727 by u/katkip

function u(t) {

c.style.filter='invert() blur(20px) contrast(49)',c.width|=0,x.arc(960,540,200,0,7,x.arc(960+S(t)*600,540+C(t)*99,200,0,7)),x.fill`evenodd`

May 11 2020 11:10 AM UTC

}// 139/140

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yonatan

remix of d/17945 by u/yonatan

function u(t) {

with(x)for(c.width=i=200;i--;beginPath(stroke()))setLineDash([i/(2+S(t))]),strokeStyle=R(255-i),arc(99,56,S(i/66)**2*20,q=S(i/9)+t,q+9);

May 11 2020 8:50 PM UTC

}// 136/140

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u/katkip

bakugan