up

1-js/06-advanced-functions/08-settimeout-setinterval/1-output-numbers-100ms/solution.md

@@ -0,0 +1,42 @@
+
+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.
+