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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Axioplase

remix of d/35044 by u/Axioplase

function u(t) {

t==0?x.fillRect(0,0,m=1e3,m):d=x.getImageData(0,0,n=m*S(t),n),
x.putImageData(d,new Date%(2e3+t),new Date%(1e3+t))

Mar 12 2026 9:50 PM UTC

}// 114/140

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Windows 95

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Axioplase

function u(t) {

t==0?x.fillRect(0,0,m=1e3,m):d=x.getImageData(0,0,n=m*S(t),n),
x.putImageData(d,new Date%m,new Date%1e2)

Mar 12 2026 7:06 PM UTC

}// 104/140

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copypasta

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mathisvdr

function u(t) {

c.width|=0;for(x.fillRect(0,0,i=3e4,i);i--;x.fillRect(960+S(b+S(i/5)*t)*b*2,540+C(b+S(i/5)*t)*b,7,2))x.fillStyle=`hsl(${b=i%41*6} 99%70%)`

Mar 10 2026 3:33 PM UTC

}// 138/140

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Burst

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Xen

remix of d/35019 by u/mathisvdr

function u(t) {

for(i=2e3;i--;x.fillText(0,960+(6*C(a)+C(6*a))/7*400/Z,540+(6*S(a)-S(6*a))/7*400/Z))a=i/3e3*31.4,Z=1+S(a*3+t)*.3

Mar 10 2026 3:12 PM UTC

}// 112/140

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Slight golf

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tomxor

remix of d/35020 by u/cantelope

function u(t) {

eval(unescape(escape`𩡯𬠨𪐽𨰮𭱩𩁴𪁼👦🐨𦀬𦐩🐾𮀮𩡩𫁬𤡥𨱴𚀹𝠰𚰱𝐰𚡘𛀵𝀰𚰱𝐰𚡙𛀹𛀹𚐻𪐭𛐻𫐾𜠿𩠨𤠬𥀬𤠽𤰨𪐩𛁔👃𚁩𚐩𞠨𬀽𠰨𭀫𫐩𚠳𛠵𛁦𚁘👓𚀲𚡭𚐪𬀬𦐽𠰨𜠪𫐩𚡰𚐬𩀽𣑡𭁨𛡨𮑰𫱴𚁘𛐽𤠬𦐭👔𚐪𜠬𤠭👘𛱤𛁔𛐽𦐯𩀩𚑭👩𙐴`.replace(/u../g,'')))

Mar 10 2026 1:55 AM UTC

}// 130/140

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repulsors and blobbo - smoler

u/cantelope

nice

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Xen

function u(t) {

for(q=i=1e3;i--;x.strokeStyle=`hsl(${i*t%i*109},70%,30%,.03)`)x.strokeRect(i*t%q/5+C(t/2)*q,i+S(t)*9-109,q,q)

Mar 10 2026 6:06 PM UTC

}// 109/140

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.br0ken.

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GREEN

remix of d/35028 by u/mathisvdr

function u(t) {

c.width|=0;for(x.fillRect(0,0,i=3e4,i);i--;x.fillRect(960+S(a)*S(b+t)*280,540+C(a)*280,5,2))x.fillStyle=`hsl(${b=i%60*6} 99%70%)`,a=i/40

Mar 11 2026 3:16 AM UTC

}// 136/140

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KilledByAPixel

remix of d/35006 by u/tomxor

function u(t) {

for(j of Date(c.width|=X=9).slice(16,24))for(X+=4,i=15;i--;)'筯璓珧秧䧭秏篏䤧篯积А'.charCodeAt(j<=9?j:10)&1<<i&&x.fillRect(X+i%3<<5,15+i/3<<5,32,32)

Mar 7 2026 9:03 PM UTC

}// 138/140

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Digital #Clock 🕰️

u/NiVZ

Wow! I had this in mind when I posted my sweet but had no idea how to pull it off. Well done 👏
u/KilledByAPixel

thanks for the inspiration!

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cantelope

function u(t) {

eval(unescape(escape`𩡯𬠨𤀽𦱩👨🐶𝐬𭰽𨰮𭱩𩁴𪀽𜐱𜡝𞱩𛐭𞰩𤁛𪑝👛𚁩𚠪𜠫𭀪𚁩𙐲🱩𞡨𚐩𙑷𛁩𚡷𙑨𧐊𩡯𬠨𪐽𪀪𭰻𩀽𪐭𛐻𮀮𩡩𫁬𤡥𨱴𚁘𛁙𛀱𛀱𛁸𛡦𪑬𫁓𭁹𫁥👒𚁥𚠳𚐩𚑐𛡭𨑰𚀨𬐬𪠩🐾𚁦👍𨑴𪀮𪁹𬁯𭀨𬑛𜁝𛐨𦀽𪐥𭰩𛁱𦰱𧐭𚁙👩𛱷𯀰𚐩𚐼𩀦𙠨𩐽𪠬𩀽𩠩𚐻`.replace(/u../g,'')))

Mar 8 2026 1:18 AM UTC

}// 140/140

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voronoi cells

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mathisvdr

function u(t) {

eval(unescape(escape`𩡯𬠨𢀽𣑡𭁨𛡨𮑰𫱴𛁐👛𪐽𫠽𝠵𛁷👣𛡷𪑤𭁨🐹𞑝𞱩𛐭𞰩𤁛𪑝👛𚁩𚡩𚱴𚡩𚐥𭰬𪐥𭱝𒡦𫱲𚁩👮𚡷𞱤👩𛐭𞱸𛡦𪑬𫁒𩑣𭀨𦀬𦐬𜐬𜐬𮀮𩡩𫁬𤱴𮑬𩐽𤠨𜀬𩐪𜰬𩐪𝀩𚐩𤀮𫑡𬀨𚁱𛁪𚐽🠨𩠽𢀨𬑛𜁝𛐨𦀽𪐥𭰩𛁱𦰱𧐭𚁙👩𛱷𯀰𚐩𚐼𩀦𙠨𩐽𪠬𩀽𩠩𚐠`.replace(/u../g,'')))

Mar 8 2026 3:00 PM UTC

}// 139/140

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ice voronoi