Check whether a number is a Fibonacci number or not JavaScript

We are required to write a JavaScript function that takes in a number and returns a boolean based on the fact whether or not it comes in the fibonacci series.

For example −

If the function call is like this −

fibonacci(12); fibonacci(89); fibonacci(55); fibonacci(534);

Then the output should be −

False true true false

Now, let’s write a recursive solution to this problem −

Example

const fibonacci = (query, count = 1, last = 0) => {    if(count < query){       return fibonacci(query, count+last, count);    };    if(count === query){       return true;    }    return false; }; console.log(fibonacci(12)); console.log(fibonacci(55)); console.log(fibonacci(89)); console.log(fibonacci(534));

Output

The output in the console will be −

false true true false