## Sum input numbers

importance: 4

Write the function `sumInput()`

that:

- Asks the user for values using
`prompt`

and stores the values in the array. - Finishes asking when the user enters a non-numeric value, an empty string, or presses “Cancel”.
- Calculates and returns the sum of array items.

P.S. A zero `0`

is a valid number, please don’t stop the input on zero.

Please note the subtle, but important detail of the solution. We don’t convert `value`

to number instantly after `prompt`

, because after `value = +value`

we would not be able to tell an empty string (stop sign) from the zero (valid number). We do it later instead.

```
function sumInput() {
let numbers = [];
while (true) {
let value = prompt("A number please?", 0);
// should we cancel?
if (value === "" || value === null || !isFinite(value)) break;
numbers.push(+value);
}
let sum = 0;
for (let number of numbers) {
sum += number;
}
return sum;
}
alert( sumInput() );
```