Codegolf: Fireworks

https://codegolf.stackexchange.com/questions/129838/4th-of-july-fireworks

by 2ndAttmt

HTML

<pre id="fireworks"></pre>

JavaScript

let fireworks =

(w,h,p,i,r=0,s=($=>{while(++r<i)for(j=0,_=$[r]=[],z=$[r-1]||[];j<w*h;){k=j+1,l='*',c=0
n=(j%w&&z[j-1]==l&&++c)|(k%w&&z[k]==l&&++c)?'-':' '
n=(z[j-w]==l&&++c)|(z[j+w]==l&&++c)?'|':n
n=(j%w&&z[j-w-1]==l&&++c)|(k%w&&z[k+w]==l&&++c)?'\\':n
n=(k%w&&z[k-w]==l&&++c)|(j%w&&z[j+w-1]==l&&++c)?'/':n
_[j++]=Math.random()<p?l:c>1?'X':n}})(x=[])||x)=>{c=document.body.children[0],r=0;while(++r<i)setTimeout((k=0)=>{for(r++,c.innerHTML='';k<h;)c.innerHTML+=s[r].slice(k*w,++k*w).join('')+'\n'},90*r);r=0}

fireworks(50, 25, 0.005, 100);