JS1k: The JavaScript code golfing competition

H=()=>{return"#"+"F00FF090F".substr(A(0,6),3)};A=(b,d)=>{return(d-b)*Math.random()+b};L=(b)=>{for(p in b)b[p[0]+(p[6]||"")]=b[p]};F=(b,d)=>{b[T="strokeStyle"]=H();b.ba();b.a(P+A(100,C),d,A(9,C),0,7);b.s()};Y=()=>{[x,y].map((b)=>{b.fc(P,0,2*W,C);X=P/W;if(0<X){F(b,0);F(b,C);if(3<X&&8>X)for(q=0;9>q;q++)for(z=A(1,9)*q*9,Z=A(3,9)*q*5,b.se([n=A(3,9),3]),i=0;i<n;i++)for(Z+=9,b[T]=H(),b.ba(),j=0;j<n;j++)b.m(V=P+z+j*A(25,50),Z),b.l(V+A(50,150),Z),b.s();if(1<X)for(v=0;21>v;v++)b[T]=H(),b.lineWidth=A(1,9),b.ba(),b.m(z=P+45*v,A(9,C)),b.l(z,A(9,C)),b.s()}});P+=W;P%=9*W};L(c);c.fc(0,0,a[U="width"]=W=900,a.height=C=400);x=(s=a[o="cloneNode"]())[B="getContext"]("2d");y=(t=a[o]())[B]("2d");s[U]=t[U]=9*W;P=I=0;L(x);L(y);Y();setInterval(()=>{c[h="globalCompositeOperation"]="source-over";c[k="globalAlpha"]=1-X/12;c.fc(0,0,W,C);c[h]="lighter";c[k]=.5;for(i=0;i<W/2;++i)E=2*i/W,Q=(1+E)*C/2,O=9*C*E,c.da(s,J=I+250-250*E,K=(C-Q)/2,R=30*E+1,Q,W/2-i,(C-O)/2,N=60*E,O),c.da(t,J,K,R,Q,W/2+i,(C-O)/2,N,O);I+=5;I%=9*W;(I+C)%W^0?1:Y()},16)

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