up

1-js/8-more-functions/07-settimeout-setinterval/1-output-numbers-100ms/solution.md

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+
+Using `setInterval`:
+
+```js run
+function printNumbers(from, to) {
+  let current = from;
+
+  let timerId = setInterval(function() {
+    alert(current);
+    if (current == to) {
+      clearInterval(timerId);
+    }
+    current++;
+  }, 1000);
+}
+
+// usage:
+printNumbers(5, 10);
+```
+
+Using recursive `setTimeout`:
+
+
+```js run
+function printNumbers(from, to) {
+  let current = from;
+
+  setTimeout(function go() {
+    alert(current);
+    if (current < to) {
+      setTimeout(go, 1000);
+    }
+    current++;
+  }, 1000);
+}
+
+// usage:
+printNumbers(5, 10);
+```
+
+Note that in both solutions, there is an initial delay before the first output. Sometimes we need to add a line to make the first output immediately, that's easy to do.
+

1-js/8-more-functions/07-settimeout-setinterval/1-output-numbers-100ms/task.md

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+importance: 5
+
+---
+
+# Output every second
+
+Write a function `printNumbers(from, to)` that outputs a number every second, starting from `from` and ending with `two`.
+
+Make two variants of the solution.
+
+1. Using `setInterval`.
+2. Using recursive `setTimeout`.
+