console log fibonacci sequence code example

Example 1: how to generate a fibonacci sequence in javascript

// declare the array starting with the first 2 values of the fibonacci sequence
    let fibonacci = [0,1];
    
    function listFibonacci(num) {
    // starting at array index 1, and push current index + previous index to the array
        for (let i = 1; i < num; i++) {
            fibonacci.push(fibonacci[i] + fibonacci[i - 1]);
        }
        console.log(fibonacci);
    }
    
    listFibonacci(10);

Example 2: fibonacci sums javascript

// Implement a method that finds the sum of the first n
// fibonacci numbers recursively. Assume n > 0

function fibsSum(n) {
    if ( n === 1 ) {
        return 1;
    }
    if (n === 2 ) {
        return 2;
    }
    let sum = fibsSum(n-1) + n;
    return sum;
}