Fibonacci Series

function FibonacciSeriesRecursive(index) {
    if(index<2) {
        return index;
    }
    return FibonacciSeriesRecursive(index-2) + FibonacciSeriesRecursive(index-1)
}

console.log(FibonacciSeriesRecursive(10));

function fibonacciSeriesIterative(num) {
    const arr1 = [0,1];
    
    for(let i=2; i <= num; i++) {
       arr1.push(arr1[i-2]+arr1[i-1]);
    }
    return arr1[num];
}
console.log(fibonacciSeriesIterative(10));