JavaScript Fibonacci Algorithm with ASP.NET MVC JavaScript

A fibonacci number can be determined by checking if the result of (5*n*n + 4) or (5*n*n - 4) or both are a perfect square.

function isFibonacci(num) {
    return isPerfectSquare(5*num*num + 4) || isPerfectSquare(5*num*num - 4);
}

function isPerfectSquare(n) {
    return Math.sqrt(n) % 1 === 0;
}

NOTE: Although there are ways to do this by either doing a recursive function or creating a loop, these methods would prove inefficient for large numbers.

Answer:1

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