loop.md

<< return back

There is an array [1, 2, 3, 4, 5]. Does calculated sum is correct?

    const arr = [1, 2, 3, 4, 5]
    var i = 0;
    var sum = 0;
    while (i++ < arr.length - 1) {
        sum += arr[i]
    }

Correct answer

No. By using while loop result will be equal to 14. Because during first iteration i = 1 and value for first element arr[0] will be absent. The correct sum is 15.