Recursive implementation to sum natural numbers

sum-natural-numbers.js

const input1 = 10;
const input2 = 1;
const input3 = 0;

const sumNaturalNumbers = (n) => {
    if (n <= 1)
        return n;
    return n + sumNaturalNumbers(n - 1);
}

console.log(sumNaturalNumbers(input1));
console.log(sumNaturalNumbers(input2));
console.log(sumNaturalNumbers(input3));