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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taupelink

remix of d/35647 by u/taupelink

function u(t) {

for(i=z=2e3;i--;x.fillRect(i,t*174,z/=.8-C(i/166+t*z)/10,9))x.fillStyle=R(r=32+(z>>=2)*++z*6,r*=(q=.7+z%.8),r*q,.5),z+=4-6*C(i/122-z)*S(t*2)

Jun 18 2026 3:53 AM UTC

}// 140/140

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d/35654 👀

u/taupelink

Not planned. A glowing O appeared while I was aimlessly fiddling with the numbers. Then I cleaned up the image a little, zoomed out to make it a bunch of O's, and brought out the blue highlights.

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taupelink

remix of d/35647 by u/taupelink

function u(t) {

for(i=z=1080;i--;x.fillRect(480*t,i,9,z/=.7-C(i/r)/e))x.fillStyle=R(r=1+(z=z%4+z*.3|0)*++z,r*(q=z%.6+.8),r**q,.3),z+=4-5*S(i**.5*C(e=z+t/z))

Jun 19 2026 1:50 AM UTC

}// 140/140

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d/35664

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rodrigo.siqueira

remix of d/35623 by u/rodrigo.siqueira

function u(t) {

for(X=Y=i=2e4;i--;x.fillRect(Y*300+960,900-X*540,t<2,1))u=X-.6,r=(u*u+Y*Y)**.5,s=C(i*i/t)<.9||-2,X=s*(r+u)/3+T(X/2),Y=s*(r-u)**.7*(Y<0?-1:1)

Jun 18 2026 9:10 PM UTC

}// 140/140

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White point spiral | Black point spiral

u/taupelink

👀

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46uuuu

function u(t) {

k=`j 3 = for & ! 3 := 2`
eval(k[a="replace"](/j/g,"let")[a](/3/g,"test")[a](/ & /g,`;
`)[a](/for/g,4)[a](/:=/g,"/=")[a](/!/g,"throw"))

Jun 19 2026 7:37 PM UTC

}// 134/140

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wierd js (interper)

u/joeytwiddle

Very weird. (Replace eval with throw to see what is generated.)
u/joeytwiddle

But I see potential here for a useful mini language. What if R performed fillRect or L performed lineTo? Could you draw something?

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Tekmap

remix of d/32376 by u/rodrigo.siqueira

function u(t) {

x.fillRect(x.globalAlpha=.05,0,2e3,2e3)
for(j=18;j--;)for(i=791;i--;R=40*j-9)x.clearRect(960+S(i+S(j/3+t)/3)*R,540+C(i)*R*(.4+T(i+t)/4),4,4)

Jun 17 2026 5:23 PM UTC

}// 140/140

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magna

function u(t) {

c.outerHTML='<marquee style=aspect-ratio:16/9 direction=down behavior=alternate><marquee behavior=alternate><i><h1>DVD'

Jun 16 2026 11:17 PM UTC

}// 119/140

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#dvd https://bsky.app/profile/zachleat.com/post/3…

u/lewdev

That's awesome!
u/joeytwiddle

#css
u/magna

#html

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46uuuu

function u(t) {

x.fillRect(t**=t,t,t,t)

Jun 19 2026 1:26 AM UTC

}// 23/140

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Stairs (extreme 23 byte)

u/SockTaters

d/32731

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46uuuu

function u(t) {

throw code.split("").reverse().join("")

Jun 19 2026 12:27 AM UTC

}// 39/140

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u/joeytwiddle

#eniuq

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rodrigo.siqueira

remix of d/35622 by u/taupelink

function u(t) {

a=x=>(x*x-1)**2/33;f=u=>a(a(a(u%12-6)-4)-4);g=n=>f(X/n)*f(Y/n)&1;for(i=2e4>>t;i--;x.fillRect(96+9*X,120+9*Y,g(4),g(4)))X=i*t%192,Y=X*i%95

Jun 16 2026 7:05 PM UTC

}// 137/140

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ticket strip

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SockTaters

remix of d/35644 by u/46uuuu

function u(t) {

t?c.width|=0:s=99 
x.font=s+"px'"
a=s<800
x.fillText(a?"👼":"👹",800-s/2,800)
s+=playing-1&&a&&200

Jun 17 2026 10:07 PM UTC

}// 96/140

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normal angel, don't worry about it

u/SockTaters

This seems to work on the old frontend but not the new one, for both mobile and desktop