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Original file line number Diff line number Diff line change
@@ -59,3 +59,29 @@ function printNumbers(from, to) {

printNumbers(5, 10);
```

В примере выше будет ошибка для случая printNumbers(5, 5) при обращение к timerId. Можно использовать var для всплытия или вынести timerId в начало функции

```js run
function printNumbers(from, to) {
let timerId
let current = from;

function go() {
alert(current);
if (current == to && timerId) {
clearInterval(timerId);
}
current++;
}

*!*
go();
*/!*
if (current <= to) {
timerId = setInterval(go, 1000);
}
}

printNumbers(5, 10);
```