Dwitter - javascript demos in 140 characters

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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Xen

function u(t) {

x.fillText(2,-1,c.width=1)

Jun 23 2020 4:13 PM UTC

}// 26/140

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#Blacklivesmatter

u/DataMeta

cheeky as heck :)
u/DataMeta

✊🏻✊🏾✊🏽✊🏼✊🏿

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geb

remix of d/19253 by u/geb

function u(t) {

for(l=0,o=[a=1,b=2];l++-19;)o.push(b+=a++)
throw o+'\n https://oeis.org/A089071'

Jun 26 2020 5:47 PM UTC

}// 80/140

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Number of liberties a big eye of size n gives in the game of Go.

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whatsinmyopsec

function u(t) {

for(i=2e3,f=(X,Y,n=59)=>Y?f(T(X)*X-Y*Y+.4,X*Y-.9,n+.9):x.fillStyle=`hsl(${n*5} 90% ${S(n)*90}%`;i--;x.fillRect(i,t*60,1,i))f(i/1e3-1,1-t/4)

Jun 26 2020 1:56 PM UTC

}// 139/140

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geb

remix of d/19242 by u/geb

function u(t) {

for(a=0,_=[r=1,p=1,g=1];a++-11;)_.push(p+=_[a-g])
throw _

Jun 26 2020 11:01 AM UTC

}// 57/140

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https://oeis.org/A000930 #Narayana #oeis

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Irratix

function u(t) {

rowAmt = 10
c=(n,k)=>k?n*c(n-1,k-1)/k:1
if(t){n=[];for(i=-1;i++<rowAmt;n[i].push("\n"))for(n[i]=[],j=-1;j++-i;n[i][j]=c(i,j)+" ");throw(n)}

Jun 23 2020 8:49 PM UTC

}// 139/140

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Pascal's Triangle. Could easily be shorter (probably)

u/Irratix

Still had a lot of room left, so I made an easily visible rowAmt variable for you to tweak :D
u/tomxor

I used this same little function recently for the intensities in simulated NMR multiplets. Pretty sure this is the shortest math.

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Xen

remix of d/19217 by u/bandaloo

function u(t) {

for(i=2e3;i--;x.fillStyle=`hsl(${i*C(t/99-i/t)},99%,${33*(S(i/(t%99))+C(S(t*9+i/3e3)))}%`)x.fillRect(i,0,1,9);x.drawImage(c,0,7)

Jun 23 2020 3:46 PM UTC

}// 128/140

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Had to Remix!

u/bandaloo

i love how this morphs over time
u/Xen

the slow glitchy lines i like

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Xen

remix of d/19227 by u/robbyg

function u(t) {

for(s=H=50;H--;)for(V=s;V--;x.fillRect(H*s,V*s,s,s))x.fillStyle=R(V,H,((C(V-t*39)>C(V*H))+2)*59,.4)

Jun 24 2020 6:56 PM UTC

}// 99/140

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Quick test

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rodrigo.siqueira

remix of d/19016 by u/rodrigo.siqueira

function u(t) {

for(i=880;i--;x.fillStyle=`hsl(${200+i*1.2+S(t)*88},99%,${(i>200)||i/3}%)`)x.fillRect(C(i*i+t/9)*i*9,200+T(i+t/3)*i/1,i,i)

Jun 22 2020 2:42 PM UTC

}// 122/140

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Falling #squares

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OlegSchwann

function u(t) {

h=S(t)*128+128
x.fillStyle=R(h,h,h)
r=Math.random
x.fillRect(r()*1920,r()*1080,h,h)

Jun 23 2020 5:13 PM UTC

}// 83/140

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Pecosbilbo

function u(t) {

x.fillStyle="#FFFFFF";x.fillRect(0,0,1920,1080);x.fillStyle=R(0,0,0);for(i=0;i<1080/10;i++){x.fillRect(500*C(t*i/100)+990,i*10,50,150);}

Jun 25 2020 12:33 AM UTC

}// 136/140

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e pluribus unum