Find the second largest number in array js

function findsecond(a,n){

let second_largest = 0;

for(let i=n-2; i>=0; i--){

if(a[i]!= a[n-1]){

second_largest = a[i]

break;

}}

return second_largest;

}

const a = [12,35,1,10,34,35]

let n= a.length

let ans = findsecond(a,n);

console.log(ans)