Find sum of natural numbers using recursion

Steps:

• Create program using recursion
• Call the function recursively until number is 1.

function sum(num) {
    let val = 0;
    if (num > 0) {
        val = num + sum(num - 1);
    } else {
        val = num;
    }
    return val;
}

sum(6);

References:

• JavaScript Program to Find Sum of Natural Numbers Using Recursion