Check if a number is a Fibonacci in JavaScript
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const isFibonacci = (num, count = 1, last = 0) => {
if(count < num){
return isFibonacci(num, count+last, count);
};
if(count === num){
return true;
}
return false;
};
console.log(isFibonacci(1)); //true
console.log(isFibonacci(2)); //true
console.log(isFibonacci(89)); //true
console.log(isFibonacci(7)); //false
