why the last number of the exercise is NaN?

Question

im doing a exercise of bills, tips and total of the all.

const calcTip = function (bill) {
  return bill >= 50 && bill <= 300 ? bill * 0.15 : bill * 0.2;
};

const billsArray = [22, 295, 176, 440, 37, 105, 10, 1100, 86, 52];
const tipsArray = [];
const totalsArray = [];

for (let i = 0; i <= billsArray.length; i++) {
  const tip = calcTip(billsArray[i]);
  tipsArray.push(tip);
  totalsArray.push(tip + billsArray[i]);
}

console.log(billsArray, tipsArray, totalsArray);

It's all right but in the browser console said that last one is not a number? someone knows why? do i need to use float?

You need to use `<` not `<=` in your loop – Lee Taylor Dec 29 '22 at 23:14 — Lee Taylor, Dec 29 '22 at 23:14
@Lee Taylor nice, I didn’t notice that – Parking Master Dec 29 '22 at 23:15 — Parking Master, Dec 29 '22 at 23:15
Mine actually returns `null` – Parking Master Dec 29 '22 at 23:18 — Parking Master, Dec 29 '22 at 23:18

score 3 · Answer 1 · answered Dec 29 '22 at 23:15

3

it's because you didn't set condition <= exactly in for loop. it should be i<billsArray.length

answered Dec 29 '22 at 23:15

David F

605
4
10

it's my pleasure to help you. – David F Dec 29 '22 at 23:17
This works. I’ve tested both myself and it works now, – Parking Master Dec 29 '22 at 23:18

score 1 · Answer 2 · answered Dec 29 '22 at 23:17

1

It's because of out of array index i <= billsArray.length

can fixable with i < billsArray.length or i <= billsArray.length - 1

answered Dec 29 '22 at 23:17

Thusithz

736
1
12
33

why the last number of the exercise is NaN?

2 Answers2