sum of first n odd numbers code example

Example 1: first n even numbers sum javascript

// return the sum of the first n even numbers recursively. Assume n > 0

function firstEvenNumbersSum(n) {
    if (n === 0) {
        return 0;
    }
    let num = (n * 2);
    let sum = num + firstEvenNumbersSum(n-1)
    return sum;
}

Example 2: check odd numbers numpy

# Input
arr = np.array([0, 1, 2, 3, 4, 5, 6, 7, 8, 9])
arr[arr % 2 == 1]
#> array([1, 3, 5, 7, 9])