now with a (slightly) less rubbish #pri… by joe.m

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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joe.m

remix of d/16019 by u/joe.m

function u(t) {

if(!t){r=1,d=100}
for(z=d;z--;){
r++
n=0
for(i=r**.5|0;i>1&&n==0;i--)if((r/i)==(r/i|0))n=1
if(!n) x.fillRect(960+r/d*C(r),540+r/d*S(r),4,4)}

Oct 11 2019 9:48 AM UTC

}// 140/140

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now with a (slightly) less rubbish #prime test

u/pavel

91 for(d=z=99;z--;i||x.fillRect(960+r/d*C(r),540+r/d*S(r),4,4))for(r=t&&r+1,i=r**.5|0;r%i--;);
u/katkip

u used 3blue1brown video


      u(t) is called 60 times per second.
      t: elapsed time in seconds.
      c: A 1920x1080 canvas.
      x: A 2D context for that canvas.
      S: Math.sin
      C: Math.cos
      T: Math.tan
      R: Generates rgba-strings, ex.: R(255, 255, 255, 0.5)

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