JSFiddle - React, Tailwind, and code Playground

HTML

<h2 id="result"></h2>
<h3 id="it"></h3>

JavaScript

$(function() {
var num=[1020215,2000,35,2,54546,456,2,2345,24,545,132,5469,25653,0,2315648978523];
var count=0; 
var j=num.length-1;
var firstHighest=0,seoncdHighest=0;
num[0] >num[num.length-1]?(firstHighest=num[0],seoncdHighest=num[num.length-1]):(firstHighest=num[num.length-1],   seoncdHighest=num[0]);
j--;
for(var i=1;i<=num.length/2;i++,j--)
{
   if(num[i] < num[j] )
   {
          if(firstHighest < num[j]){
          seoncdHighest=firstHighest;
           firstHighest= num[j];
          }
           else if(seoncdHighest < num[j] ) {
               seoncdHighest= num[j];
               
           }
   }
   else {
       if(firstHighest < num[i])
       {
           seoncdHighest=firstHighest;
           firstHighest= num[i];
           
       }
       else if(seoncdHighest < num[i] ) {
            seoncdHighest= num[i];
           
       }
   }
      
}         
       $("#it").html(count);
 $("#result").html(firstHighest+","+seoncdHighest );
    });