JS1k: The JavaScript code golfing competition

for(_="on~~text@\\n?'?'ZputYforX),reera.throcessc.fill))udioS(Aenat=t=>{`,` = 140($in|0},${Mh.pow(1-ti~	top.loc	.hash size=>??value.}}cch(e){}}`);Mh.=eval(`{$})=>{try{${i?<Y maxlg= id=i.=ob(.slice(1.split(Z)[
$=[`ttime__sec~dsSsCcosTtanNrandom`];stAdjactHTML(`aftd<p><b><h1>DWITTER—SON1K?A Visual LIVE codg vir~mt X e Twitt g	?Sha e currt URL 🐦</h1>AUDIOaVISUALv${$.jo(Z)}?aA512x256 canvas?cIts 2D c@?Rrgba-strg meod ex R(,,,.5`);R=(r,g,b,a=1)=>`rgba{rgba})`;ia
0]||'turn(N()*(q=*2%1,8)+/8%1,16)*8)+(t*(t&24|32)*[4,3,25,0,4,1,3][t*8&7]%1/32';iv
1]||'X(d=f=300;d-=.5;Rect(256+d*C(A128+d*d/9+q*q,d/9A=N()*6.3,Style=R(f*+t*3+*f/d+t,f**5-t*3d)';(~Yfaafvv=btoa(i+Z+iv.)})a=new AC@);wiceScriptPor(4096,fquestAnim	Framef,fv(t/1000})t=01c~nectdest	~apX(t=t.outYBuff.getChannelDa(=0);<4096;)t[++]=fat+=1/$sampleRe)}";G=/[
-X-Z?@~]/.exec(_);)with(_.split(G))_=join(shift());eval(_)

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

$ = [
  `t = time_in_seconds`,
  `S = Math.sin`,
  `C = Math.cos`,
  `T = Math.tan`,
  `N = Math.random`
];
a.insertAdjacentHTML(`afterend`, `<pre><b><h1>DWITTER—SON1K\nAudio Visual LIVE coding environment for the Twitter generation\nShare the current URL 🐦</h1>AUDIO\n<input maxlength=140 id=ia size=140>\n\nVISUAL\n<input maxlength=140 id=iv size=140>\n\n${$.join('\n')}\na = A 512x256 canvas\nc = Its 2D context\nR = rgba-string method ex R(140,140,140,.5`);
R = (r, g, b, a = 1) => `rgba(${r|0},${g|0},${b|0},${a})`;

ia.value = atob(top.location.hash.slice(1)).split("\n")[0] || "return(N()*(q=Math.pow(1-t*2%1,8)+Math.pow(1-t/8%1,16)*8)+(t*(t&24|32)*[4,3,2,5,0,4,1,3][t*8&7]%1))/32";
iv.value = atob(top.location.hash.slice(1)).split("\n")[1] || "for(d=f=300;d-=.5;c.fillRect(256+d*C(A),128+d*S(A),d/9+q*q,d/9))A=N()*6.3,c.fillStyle=R(f*S(A+t*3+S(A*f/d+t)),f*S(A*5-t*3),d)";

(oninput = t => {
  fa = eval(`(${$})=>{try{${ia.value}}catch(e){}}`);
  fv = eval(`(${$})=>{try{${iv.value}}catch(e){}}`);
  top.location.hash = btoa(ia.value + "\n" + iv.value)
})($a = new AudioContext);

with($a.createScriptProcessor(4096, ($f = t => {
  requestAnimationFrame($f, fv(t / 1000))
})($t = 0), 1))
  connect($a.destination), onaudioprocess = t => {
    for (t = t.outputBuffer.getChannelData(value = 0); value < 4096;)
      t[value++] = fa($t += 1 / $a.sampleRate)
  }