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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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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) {

for(i=1080,v=212;i--;x.fillStyle=R(T(i/v+t*60/12)*v,T(i/v+t*60/18)*v,T(i/v+t*60/24)*v))x.fillRect(0,i,1920,1);

Apr 20 2018 3:55 PM UTC

}// 110/140

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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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Blane

function u(t) {

c.width^=0;with(x){for(i=999;i--;)fillRect(960*(1+T(9e2/(i-1))),540*(1-T((9e9)/(i**.5+1e-8*t))),10,10)}

Apr 20 2018 3:13 PM UTC

}// 103/140

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Xen

remix of d/7713 by u/anthonylewis

function u(t) {

c.width|=0,x.globalAlpha=.2
for(i=99;i--;x.arc(S(t+7*t%i)*400+960,C(t+i%t)*400+540,i,0,6.28))x.beginPath(x.fill())

Apr 20 2018 7:09 AM UTC

}// 114/140

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anthonylewis

remix of d/7659 by u/New_Core

function u(t) {

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

Apr 20 2018 12:16 AM UTC

}// 82/140

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A simple tunnel to use a base for future effects (hopefully)

u/jylikangas

You can use strokeRect here. Golfed to 71b... for(w=c.width|=i=30;i--;x.strokeRect(960-Z/2,540-Z/2,Z,Z))Z=w/(i-t%2+1)
u/magna

#tunnel

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hollo47

function u(t) {

c.width=1920
n=300
f=345
x.beginPath()
for(i=0;i<=n;i++){z=-4+S(t)-2*C(t+i*f)
x.lineTo(960+S(t+i*f)*i*4/-z,f+(C(i*f)*4+i*4)/-z)
x.stroke()}

Apr 19 2018 4:33 PM UTC

}// 139/140

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My first perspective! I know there's like a thousand of these on dwitter, but this is mine and I understand what's going on!

u/aleamb

Awesome! ;)
u/BuRRak

#perspective

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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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Agnes

function u(t) {

with(x)for(w=c.width|=i=36;i--;)for(j=M=24;j--;)fillStyle=R(0,3*i*(1+C(t/18)),255*i/36,i/36),fillRect(w*j/M,540+i/36+150*S(i+j+t),w/M,540);

Apr 19 2018 7:42 AM UTC

}// 139/140

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#sea #ocean

u/iverjo

#water