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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.

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Current theme challenge: #Opposites

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taupelink

remix of d/29741 by u/taupelink

function u(t) {

f=(u,m=5)=>(m>2?f(u,m*.8)/p-m:u%p-p/2)**2;g=_=>f(X/5)+f(Y/5)&3;for(i=1e4;i--;x.fillRect(420+18*X,18*Y,t<g(p=3),t<g(p=2)))X=i*i*t%60,Y=X*i%60

Apr 5 2024 8:44 PM UTC

}// 140/140

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d/29747 4x4 and 6x6

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Tekmap

remix of d/15449 by u/DataMeta

function u(t) {

if(t++<255)for(i=2e3;i--;)Q=(h=i-960)*h/4e5-2,
x.fillStyle=R(l=t*i/18%232,T(t)*i/9,240-l),
x.fillRect(i+60,540+C(t+l/36)*l*Q,9,9)

Mar 30 2024 10:10 PM UTC

}// 129/140

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gregorythe7771st

function u(t) {

if(t<1/60){for(i=1,m=[540];i<1920;i++){let r=Math.random()*10-5;m[i]=m[i-1]+r;x.beginPath();x.moveTo(i,1080);x.lineTo(i,m[i]);x.stroke()}}

Mar 27 2024 3:22 PM UTC

}// 138/140

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Terrain generator

u/Cycro997

console.log("I FOUND YOU")

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taupelink

remix of d/29674 by u/taupelink

function u(t) {

a=Math.abs;f=v=>a(v%r-r/2)+a(v%8-4);for(i=1e4;i--;x.fillRect(960+80*r*C(h),1080-90*r*S(h),t<4,a(f(6*r+7*h)-f(r+14*h))&3))r=i*i*t%8+4,h=r*i%4

Mar 20 2024 1:43 AM UTC

}// 140/140

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d/29682

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CaptainMeat

function u(t) {

c.width=500;r=Math.random
for(z=0;z<2e3;z+=10)for(y=0;y<2e3;y+=10)x.fillText(z+y,z,y)
x.drawImage(c,(r()*C(t))*500,(r()*S(t))*500)

Mar 18 2024 3:56 PM UTC

}// 130/140

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remake of https://openprocessing.org/sketch/2212557

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DaSpider

function u(t) {

b=(T=t|0)%3?'':'Fizz'
throw T%5?b||T:b+'Buzz'

Mar 16 2024 5:33 AM UTC

}// 45/140

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Golfing for #FizzBuzz record

u/Odog8

Nice
u/Xen

bang on!

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384.cz

function u(t) {

eval(unescape(escape`𥀮𭡡𫁵𩑏𩠽𧰽🡍𨑴𪀮𬡡𫡤𫱭𚀩𚠲𝐶𒡴𯁼𚁧👸𛡣𬡥𨑴𩑌𪑮𩑡𬡇𬡡𩁩𩑮𭀨𥀬𥀬𥀪𞐬𥀩𛁪🐰𚐊𩡯𬠨𪐽𞐻𪐭𛐻𮀮𬡥𨱴𚀰𛀰𛀲𩐳𛀲𩐳𚐩𩰮𨑤𩁃𫱬𫱲𤱴𫱰𚀨𚁩𚱪𚰫𚐯𞐹𚐥𜐬𤠨𥀬𥀬𥀬𞐯𥀩𚐊𮀮𩡩𫁬𤱴𮑬𩐽𩰊𮀮𩡩𫁬𚀩`.replace(/u../g,'')))

Mar 14 2024 6:35 PM UTC

}// 130/140

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Neon

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rodrigo.siqueira

remix of d/29634 by u/rodrigo.siqueira

function u(t) {

for(c.width|=i=0;i<360;i+=2){x.fillStyle=`hsl(${i+t*999},70%,50%)`;x.fillRect(960+300*C(i/57)*C(t/1000),540+300*S(i/57+t*8)*S(t/10),30,30)}

Mar 11 2024 2:17 AM UTC

}// 139/140

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Code also created by Claude 3 Opus #ai - this time I just changed "t/1000" to "t/10" because it was too slow, and I added "c.width|="

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rodrigo.siqueira

remix of d/29631 by u/taupelink

function u(t) {

c.width=1920;for(i=0;i<9;i++)for(j=0;j<9;j++){x.fillStyle=`hsl(${i*20+t*88},${j*15}%,50%)`;x.fillRect(i*213,j*213,213,213)}

Mar 11 2024 2:11 AM UTC

}// 123/140

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Code created by Claude 3 Opus #ai

u/cantelope

appreciate the tag

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rodrigo.siqueira

remix of d/29628 by u/taupelink

function u(t) {

f=(u,m=7)=>(m>2?f(u,m/2)-m:u%8-4)**2/4;for(i=1e4;i--;x.fillRect(960+6*X*(1-i%3),7*Y,.5,t<(f(Y/X-4)+f(Y/4)&7)))X=i*t%99,Y=X*i%155

Mar 10 2024 8:43 PM UTC

}// 128/140

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Symmetry&7