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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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coderkid

function u(t) {

c.width^=0;for(s=-200;s<207;s=s+0.1)x.fillRect(c.width/2+S(s)*c.width/5,s*99%c.height+200+C(t*4)*200,10,10);

Dec 31 2017 5:44 AM UTC

}// 108/140

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E-Mouse

remix of d/4155 by u/Bendoman

function u(t) {

c.width=2e3,τ=Math.PI*2,ʕ=900,ɂ=20;for(i=ɂ;i--;)x.arc(ʕ+C(t*2)*-30*i,200+(i*ɂ),ɂ,0,τ),x.arc(ʕ+S(t)*30*i,ʕ-(i*ɂ),ɂ,0,τ)<x.stroke()

Dec 31 2017 12:23 AM UTC

}// 129/140

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Flopster

remix of d/4893 by u/mmagin

function u(t) {

c.width|=0
x.font="200px Arial"
for(i=0;i<1.5;i+=.25)
x.fillText("⚽", 100+1000*i, 1000-850*Math.abs(S(t-i))**.9)

Dec 30 2017 11:50 PM UTC

}// 112/140

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A demonstration that abs(sin(x))**.9 is a good compact approximation of bouncing.

u/lionleaf

Nice! that's a useful trick! Why not just abs(sin(x)) though?
u/magna

**.9 compresses the curve and makes the restitution look more realistic.
u/Flopster

See https://www.desmos.com/calculator/oxuakmyuko.

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veubeke

remix of d/4874 by u/veubeke

function u(t) {

s=1/(t+1)
c.width=1920*s
x.rotate(Math.PI/4)
x.scale(s*60,s*60)
for(a=36;a--;)
 for(b=36;b--;)
  a+b&1||x.fillRect(a,b-23,1,1)

Dec 30 2017 9:03 PM UTC

}// 126/140

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u/iverjo

Nice demonstration of aliasing

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function u(t) {

var r=Math.random;x.font='64px cousine';for(i=0;i<t;i++){x.fillStyle=R(255*r(),255*r(),255*r());x.fillText('hello',1920*r(),1080*r());}

Dec 30 2017 8:57 PM UTC

}// 135/140

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u/lionleaf

hello rg! :)

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DwittererInChief

function u(t) {

c.width=r=j=2e3;for(;j--;){if(j*t%1>t/9)x.fillRect(0,j,r,5);x.font='4em a';x.fillText((21+[7,-7,2,-8,2,9,-8,-7][j%8]).toString(36),j*69,99)}

Dec 30 2017 5:33 PM UTC

}// 140/140

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thatmichael85

remix of d/4623 by u/thatmichael85

function u(t) {

c.width|=0;for(i=1;i<180;i++){b=2*t+i;x.fillStyle=R(150,T(t*i/10)*300,t%0);x.fillRect(940+((i/60)%1)*S(b)*200,400+i*6%400,8,8);}

Dec 30 2017 4:40 PM UTC

}// 129/140

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trupples

remix of d/4838 by u/E-Mouse

function u(t) {

e='1 2 + 100 *'.split(' '),s=[]
e.map(o=>+o==o?s.push(o):(q=s.pop(),s.push(eval(s.pop()+o+q))))
document.body.innerText=s

Dec 30 2017 1:19 PM UTC

}// 121/140

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E-Mouse

function u(t) {

e='1 2 + 100 *',e=e.split(' '),s=[]
for(i in e){o=e[i],n=+o;if(n==o)s.push(n);else q=s.pop(),w=s.pop(),s.push(eval(w+o+q))}x.fillText(s,9,9)

Dec 30 2017 1:00 PM UTC

}// 140/140

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A RPN(reverse polish notation) calculator in 140 bytes. The text is really small so either you have to zoom in or change the font size.

u/E-Mouse

Enter the RPN code in the e variable ("e='1 2 + * 10'")
u/E-Mouse

Btw only js operators

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barrebas

function u(t) {

c.width|=0;x.fillStyle=R(S(t)*255,0,C(t)*255,S(t)**2+.5);for(i=1e2;i--;)x.fillRect(960+S(t+i*2)*500,540+C(t+i*t/500)*500,i/4,i/2)

Dec 30 2017 10:33 AM UTC

}// 129/140

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u/breakster

Enchanting!