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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46uuuu

function u(t) {

COUNT=9
HEIGH=200
WIDTH=50
COLOR="#000"

c.width^=0
x.fillStyle=COLOR
for(i=0;i<COUNT;i++)x.fillRect(400+i*2*WIDTH+S(t)*300,400,WIDTH,HEIGH)

Jun 14 2026 3:26 PM UTC

}// 140/140

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#customizable #default (adjust any of the 4 settings)

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taupelink

remix of d/35597 by u/taupelink

function u(t) {

for(i=z=2e3;i--;x.fillRect(i,250*t,w,z))x.fillStyle=`hsl(${6**(w=z&3)},${40+2**(z&=7)/3}%,${6*(z+=6+4*C(w+=6-3*S(i/525-z))*S(t/6*z-w))}%,.5`

Jun 14 2026 4:24 AM UTC

}// 140/140

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d/35604

u/KilledByAPixel

nice'

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taupelink

remix of d/35594 by u/taupelink

function u(t) {

eval(unescape(escape`󩭯󬬨󫜽󭌿󜌺󝝥󜼻󫜭󛜻󮌮󩭩󫍬󚌩󚝸󛭢󩝧󪝮󤍡󭍨󚍸󛭦󪝬󫍓󭍹󫍥󟝒󚍪󟝭󚬪󚍰󟜮󝌫󣝡󭍨󛭲󨝮󩍯󫜨󚜯󝜩󛍩󟝭󙜴󜌱󚭰󚬪󛬵󛍭󙜱󞜷󛍱󟝃󚍭󚜪󚬴󛼴󜌩󚜬󮍛󪜼󪬿󙽲󩝣󭌧󞬧󨝲󨼧󧜨󦌽󫜥󝌱󚬴󞌬󫜪󫜥󜬳󚬴󞌬󪬯󬜪󚍓󚍘󚭱󚜪󤼨󫜪󫜩󚽓󚍭󚜩󚬪󝌪󬌬󪜬󪜭󜬩`.replace(/u../g,'')))

Jun 16 2026 2:12 AM UTC

}// 139/140

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d/35621 - refresh for slight variation - draws 5K shapes just once

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taupelink

remix of d/35565 by u/taupelink

function u(t) {

for(i=z=1080;i--;x.fillRect(t*320,i,z+=3+S(i**.4-t/p),z/=.8+S(i/r*p-t)*p/z/2))x.fillStyle=R(r=265-(z&=11)*++z*2,r*.96,r*.87,.6),p=(-.9)**z

Jun 12 2026 10:44 PM UTC

}// 138/140

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d/35588

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46uuuu

function u(t) {

utils={noop(){},identity:x=>x,sum:(x,y)=>+x+ +y,abs:i=>i>0?i:-i,randomString:_=>btoa(Math.random()),toFunctn:x=>/fu/.test(typeof x)?x:_=>x}

Jun 15 2026 11:52 AM UTC

}// 139/140

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Micro utility (6 utils)

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taupelink

remix of d/35363 by u/taupelink

function u(t) {

for(i=z=w=2e3;i--;x.fillRect(i,270*t,w,w+z))x.fillStyle=`hsl(${6**(([z,w]=[w&7,z&3])[z&1])},${17*(w+=2+C(i/158-z))}%,${9*(z+=3+C(w-t))}%,.3`

Jun 13 2026 5:36 AM UTC

}// 140/140

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d/35597

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46uuuu

function u(t) {

Jun 15 2026 2:28 AM UTC

}// 1/140

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#syntaxerror in empty dweet

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dee-gomma

function u(t) {

eval(Z=unescape(escape`𥰽𚁑👸𛡧𩑴𢑭𨑧𩑄𨑴𨐨𜐬𜀬𭰽𜠳𜐬𭰩𚐮𩁡𭁡𒡣𛡷𪑤𭁨👷𚰱𒡸𛡦𫱮𭀽𨀳𨱭𙱠𒡸𛡦𪑬𫁔𩑸𭀨𦠬𭰭𭀪𞀰𛀸𜀩𒡦𫱲𚁡👛𛠮𛡵𚰰𧐬𪐽𜱥𝀻𪐭𛐻𚁡𦱫👩𙑷𧐦𙠽𥱛𬑝𚑼𯀨𥱛𬑝🐊𥱛𬐭𭰪𝁝𛁗𦱱𚰱𧐽𪐯𪰩𚑱👩𚠴𛐱𒡸𛡰𭑴𢑭𨑧𩑄𨑴𨐨𤐬𜀬𜀩`.replace(/u../g,'')))

Jun 13 2026 1:11 AM UTC

}// 140/140

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Melting code

u/SockTaters

#underrated

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46uuuu

function u(t) {

C=""






k=0n;o="";C.replace(/./g,s=>s=="H"?o+=`Hello World
`:s=="Q"?o+=C+`
`:s==9?o+=`9 is not implemented.
`:s=="+"&&k++);throw o

Jun 13 2026 11:44 PM UTC

}// 133/140

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HQ9+ interpreter

u/46uuuu

Change C to your HQ9+ code.

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joeytwiddle

function u(t) {

c.width|=W=500,J=255
for(i=8;i--;x.fillRect(W*X,W*Y,W,W))X=i%4,Y=i>>2,k=(3+i)/t,f=t%k<k/2?i:i^7,x.fillStyle=R(J*(f&1),J*((f&2)/2),J*((f&4)))

Jun 14 2026 10:59 PM UTC

}// 140/140

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8 primary colours flashing (sorry)

u/joeytwiddle

I just made this to explain my 8-bit childhood trauma to a friend
u/joeytwiddle

Long ago I noticed that the brightness of the colours increases in an alternating fashion: 0,4, 1,5, 2,6, 3,7. Paste ,c.style.filter='saturate(0%)',t=0 at the top to see this. It seemed to me to be intentional but odd. Now I realise it's simply because blue is the darkest primary, with red and green following. So we can get a smooth gradient by moving J*(f&1) from the first argument to the last.