Guys Pls Help me out of this.
How to check whether the input is fibonacci or not? This is node.js
var n=5,s,a,fib;
function isPerfectSquare(s){var a=Math.sqrt(s);return (a*a == s);}
function isFibonacci(n){
s=(5*Math.pow(n,2)+4 || 5*Math.pow(n,2)-4)return s;}
//How to fix this line. I don't know how to check perfect square conditions
if(isPerfectSquare(isFibonacci(n)) || isPerfectSquare(isFibonacci(n)))
{
fib=Math.round(n* 1.618); // finds the next fibonacci series of given input
console.log("The next Fibonacci number is " + fib);}
else{
console.log("The given number is not a fibonacci number");}
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