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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: #Food

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anthonylewis

remix of d/7718 by u/anthonylewis

function u(t) {

w=c.width^=0
for(i=30;i--;)
Z=w/(i-t%2+1),x.beginPath(),x.arc(960,540,Math.abs(Z),0,7),x.stroke()

Apr 21 2018 1:43 AM UTC

}// 97/140

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And now a round tunnel...

u/magna

#tunnel

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BuRRak

function u(t) {

for(i=1080;i--;x.fillStyle=R(0,0,128+S(i/250+t)*80))x.fillRect(0,i,1920,1)
x.font="5cm e"
x.fillText("🐟",1920-(t*60%2150),S(t)*32+540)

Apr 20 2018 4:24 PM UTC

}// 134/140

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A lonely fish

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mohammedamarnah

remix of d/7670 by u/mohammedamarnah

function u(t) {

v=c.width=1920;h=c.height/2;
for(i=0;i<100;i+=0.3)
x.fillRect(S(3*t*i)*500+v/2, S(2*t*i)*500+h, 10, 10)
x.stroke()

Apr 20 2018 4:09 PM UTC

}// 114/140

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u/BuRRak

Golfed down to 83 characters: c.width|=v=500 for(i=0;i<100;i+=.3) x.fillRect(S(3*t*i)*v+960,S(2*t*i)*v+540,10,10)
u/Galaxtone

@BuRRak SyntaxError: Unexpected token for
u/BalintCsala

I guess that should be a new line

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BuRRak

function u(t) {

U=I=0;
Z=Array(99).fill(0)
for(O of Q="")eval({'+':'Z[I]++','-':'Z[I]--','>':'I++','<':'I--','.':'U+=String.fromCharCode(Z[I])'}[O])
throw U

Apr 20 2018 3:23 PM UTC

}// 140/140

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Best brainfuck interpreter I could do in 140 characters, super bad code. You need to change the Q variable to your code for it to run. There are no loops or an input, but the output works just fine.

u/BuRRak

The Q variable declaration is there just so you know what to edit, it could be left out as it is not used anywhere in the code again
u/BuRRak

The output also throws a 0 before every other output

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gasaraceno

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

Apr 19 2018 3:35 PM UTC

}// 113/140

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Prisma

function u(t) {

x.fillRect(0,0,c.width,c.height); // Generates a black screen
// Useful for pranking your friends!

Apr 16 2018 10:31 PM UTC

}// 98/140

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u/Galaxtone

Not very impressive imo
u/Prisma

Not really. but I can fool my friends.

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Galaxtone

remix of d/5168 by u/rippedspine

function u(t) {

t||(a=b=0);c.onmousemove=e=>m=e;r=c.width/c.clientWidth;x.fillRect(a+=(m.x*r-a)*.2,b+=(m.y*r-b)*.2,9,9)

Apr 16 2018 9:52 PM UTC

}// 103/140

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Same as original but saved 24 bytes.

u/BalintCsala

You can just put }{a=b=0 at the end
u/Galaxtone

Saving 4 bytes.
u/Galaxtone

^ (that would save*)

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Agnes

function u(t) {

with(x)for(c.width|=i=10;i--;)for(j=11;j--;beginPath(),arc(192*(i+(j%2)/2)+15*S(a=i+j+t),108*j+15*S(a/2),6+2*S(a)*S(a/2),0,7),fill());

Apr 16 2018 11:56 AM UTC

}// 134/140

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Another curtain-like effect.

u/Agnes

#curtain

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Agnes

function u(t) {

with(x)for(c.width|=i=15;i-->1;)for(j=5;j--;beginPath(),arc(960,540,150+25*i,o=i*t,6.3/j+o),lineWidth=2*j+5,strokeStyle=R(0,40*j),stroke());

Apr 16 2018 10:50 AM UTC

}// 140/140

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Obviously inspired by https://twitter.com/beesandbombs/status/9812…

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Galaxtone

remix of d/7617 by u/dragon7076

function u(t) {

t*=2;for(i=1;i<10;i++)x.beginPath();x.moveTo(960+(i-1)*99*C(t),20*t+(i-1)*99*S(2*t));x.lineTo(960+i*99*C(t-1),20*t+i*99*S(2*t-1));x.stroke()

Apr 16 2018 10:25 AM UTC

}// 140/140

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Change the i<10 to i<5 for smaller results, t*=2 to t*=1 for "higher detail"