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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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DazeWare

function u(t) {

for (i=0;i<9;i++){
x.fillRect(25*t*S(t)+960,25*t*C(t)+540,r=10*Math.random(),r*i)}

Mar 3 2023 2:26 PM UTC

}// 83/140

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shubshub

function u(t) {

r=()=>{return 400*Math.random()};
p=R(r(),r(),r(),1),
x.fillStyle=p,x.fillRect(960+S(r())*400,500+C(t*3)*r(),1,5)

Mar 2 2023 10:40 AM UTC

}// 113/140

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The Patient Square

u/danny@hille.dk

Arrow functions can be simplified, if you only have one argument you don't need parentheses, and if your result can be expressed as a a single line you don't need curly brackets and return
u/danny@hille.dk

so r can be simplified to: r=_=>Math.random()*400
u/danny@hille.dk

Since you are using the custom random function more than four times, you can go even further with the golf. You can use a trick where you override the valueOf on an object; normally, you need to create an object, but since you don't use the trigonometric function T, you can use it like this: T.valueOf=_=>400*Math.random() x.fillStyle=R(T,T,T) x.fillRect(960+S(T)*400,500+C(t*3)*T,1,5)
u/danny@hille.dk

u/magna used this trick in d/22152
u/_louis

Thank you for the advice, Danny! ;-)

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ArthurThuczsec

function u(t) {

for(c.width^=i=frame;i--;)x.fillRect(i*99+S(i)*i,i^t*i/9,50,468)

Feb 17 2023 5:24 PM UTC

}// 64/140

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shubshub

function u(t) {

c.width=1920;x.lineWidth=2;x.strokeStyle=R(0,0,0,0.5);for(i=0;i<400;i++)x.strokeRect(i*5,S(t/1-i)*1080,1,10)

Feb 15 2023 10:14 AM UTC

}// 109/140

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The Rains Fall down in GPT

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xyper

function u(t) {

a=(S(t*143)+1)*950;b=(C(t*252)+1)*520;d=(C(t*389)+1)*90;e=(C(t*312)+1)*90;x.fillStyle=R(a/10,b/10,d,255);x.fillRect(a,b,d,e)

Feb 15 2023 8:59 AM UTC

}// 125/140

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little thing i made

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Xen

remix of d/27051 by u/lewdev

function u(t) {

onkeyup=e=>document.body.innerHTML=["key","keyCode","code"].map(k=>"<h1>"+k+": "+e[k]).join``

Feb 14 2023 1:51 AM UTC

}// 93/140

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shameful 93 golf

u/lewdev

I see, you shaved 8 characters. Nice!

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lonestar108

remix of d/27037 by u/lonestar108

function u(t) {

eval(unescape(escape`挮睩摴桼㴰ⱴ⼽㈻景爨爽ㄲⱒ㴱㈬椽欽氽〻椼㜫琻椫㴮ㄬ欽⡒⭲⩃⡩⩴⤩⩃⡩⵴⤬氽⡒⭲⩃⡩⭴⤩⩓⡩⵴⤬砮獴牯步却祬攽椩筸⹬楮敔漨㤵〫㌵⩫ⰵ㔰⬱㔪氩絸⹳瑲潫攨⤠`.replace(/u([^D].)/g,'$1%')))

Feb 12 2023 6:29 AM UTC

}// 126/140

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toroidal river

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dwq

remix of d/27016 by u/dwq

function u(t) {

a=17-+(''+t%1)[2]+'';x.font='7em"';x[s='fillStyle']='#'+a+a+a+a;x.fillRect(0,0,2e3,2e3);x[s]='red';x.fillText('🤨📸',805,580)

Feb 8 2023 10:34 PM UTC

}// 123/140

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Caught in 4K #meme

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Xen

remix of d/27019 by u/coderkid

function u(t) {

for(i=c.width|=t*9;i--;i?x.lineTo(i,y=540*S(11*i+t)+540):x.moveTo(i,y));x.stroke()

Feb 8 2023 7:27 PM UTC

}// 82/140

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golf and play

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dwq

function u(t) {

x.font='6em"';x.fillStyle=`#${(''+t%1)[2]}af`;x.fillRect(0,0,2e3,2e3);x.fillStyle='#346';x.fillText('😏 Never Gonna Give You Up 📸',280,570)

Feb 7 2023 10:34 AM UTC

}// 138/140

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#rickroll

u/dwq

#meme