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Ilya Kantor 2016-07-21 17:05:55 +03:00
parent 1bffa43db4
commit 057783d216
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1-js/4-data-structures/6-array/5-array-input-sum/solution.md
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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.
```js run demo
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;
}
}
alert( sumInput() );
```