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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rodrigo.siqueira

remix of d/35225 by u/rodrigo.siqueira

function u(t) {

c.style.filter=`invert()sepia(.7)`
for(𝕏=X=Y=i=3e4;i--;𝕏=X,x.fillRect(Y*1820+99,X*2e3-400,t<3,.1))
X=T(X*X-Y*Y/2)%(9/t)+.42,Y=C(2*𝕏*Y+6.8)

Apr 13 2026 8:47 PM UTC

}// 138/140

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abyssal

u/joeytwiddle

fascinating
u/katkip

art

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ximavus

function u(t) {

localStorage.fill=`c.width=568;for(X=568;X--;)for(Y=320;Y--;x.fillStyle=R(d=Math.random()*255,d,d))x.fillRect(X,Y,1,1)`

Apr 14 2026 8:22 AM UTC

}// 119/140

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fill program (use with d/35229 by typing the command name 'fill' and pressing enter)

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ximavus

function u(t) {

t?onkeydown=k=>{l=k.key;l[1]=='a'?s=s.slice(0,-1):s+=l[1]=='n'?(eval(localStorage[s]),s=''):l[1]?'':l}:s=''
throw s

Apr 14 2026 8:18 AM UTC

}// 115/140

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CMD prompt with programs stored on localStorage

u/cantelope

cool!
u/cantelope

works, if you follow the instructions...

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Tekmap

remix of d/33939 by u/joeytwiddle

function u(t) {

eval(unescape(escape`景爨砮晩汬剥捴⠰ⰰⱘ㵙㵩㴳攴ⱘ⤻椭ⴻ砮晩汬剥捴⠹㈰⭘⨲㔰ⰵ㐰⭙⨲㔰ⰲⰲ⤩樽椾㸹ⱘ㵃⡡㵙⭪⤫䌨戽堫琯㈫権ⱙ㵓⡡⤫匨戩ⱸ⹦楬汓瑹汥㵠桳污⠤筩㸾㑽ⰹ㤥Ⱔ笵〪℡楽┬⑻椿ㄺ⸲紩怠`.replace(/u([^D].)/g,'$1%')))

Apr 14 2026 5:53 PM UTC

}// 135/140

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Cosmic Belt

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Tekmap

function u(t) {

c.width=784;for(i=32;i--;x.fillStyle="#f22")for(j=27;j--;c.style.background=R())x.fillRect(96+i*20,400+j*6+15*T(j/8)*S(t*5-i/2-j/9),8,2)

Apr 14 2026 5:40 PM UTC

}// 136/140

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Red wave

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mark1626

remix of d/21426 by u/Pascal

function u(t) {

c.width=w=70;x.ellipse(35,10,3,3,3,0,6);x.stroke();for(i=1300;i--;)x.fillRect(X=i%w,Y=20+(i-X)/w,0<C(T(S(X/10+10*C(Y-10*t/i))+S(Y/10-t))),2)

Apr 13 2026 6:52 AM UTC

}// 140/140

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sea view

u/cantelope

ok

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ximavus

function u(t) {

c.width=568
x.translate(282,160)
for(i=1e3;i--;)x.lineTo(S(i+t)*150*C(i%3+t),C(i+t)*150*S(i%3-t))
x.stroke()

Apr 12 2026 11:48 AM UTC

}// 108/140

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3D thingy

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rodrigo.siqueira

remix of d/35223 by u/rodrigo.siqueira

function u(t) {

c.style.filter=`invert()`;𝕏=X=Y=t
for(i=4e4;i--;𝕏=X,x.fillRect(990+Y*1240,X*1220-Y*99+300,1,.1))X=S(X*X-Y*Y+.344),Y=C(2*𝕏*Y+1.26+t*t*t/39)

Apr 12 2026 2:20 PM UTC

}// 138/140

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Patterns of Emergence #waitforit

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katkip

remix of d/35228 by u/rodrigo.siqueira

function u(t) {

c.style.filter=`invert()`
for(𝕏=X=Y=i=3e4;i--;𝕏=X,x.fillRect(Y*999+999,X*999,t<3,.02))
X=T(X*X-Y*Y/2)%(9/t)+.298,Y=C(2*𝕏*Y*1.1+1.942)

Apr 14 2026 8:25 PM UTC

}// 133/140

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The spine

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Tekmap

remix of d/35235 by u/Tekmap

function u(t) {

eval(unescape(escape`景爨砮晩汬剥捴⠰ⰰⱘ㵙㵩㴳攴ⱘ⤻椭ⴻ砮晩汬剥捴⠹㈰⭘⨲㔰ⰵ㐰⭙⨲㔰ⰲⰲ⤩樽椾㸹ⱘ㵃⡡㵙⭪⤫䌨戽堪琯㈫権ⱙ㵓⡡⤫匨戩ⱸ⹦楬汓瑹汥㵠桳污⠤筩㸾㑽ⰹ㤥Ⱔ笵〪℡楽┬⑻椿ㄺ⸲紩怠`.replace(/u([^D].)/g,'$1%')))

Apr 14 2026 7:20 PM UTC

}// 135/140

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BigBong