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1-js/06-advanced-functions/08-settimeout-setinterval/3-rewrite-settimeout/solution.md

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+
+
+```js run
+let i = 0;
+
+let start = Date.now();
+
+let timer = setInterval(count, 0);
+
+function count() {
+
+  for(let j = 0; j < 1000000; j++) {
+    i++;
+  }
+
+  if (i == 1000000000) {
+    alert("Done in " + (Date.now() - start) + 'ms');
+    cancelInterval(timer);
+  }
+
+}
+```
+

1-js/06-advanced-functions/08-settimeout-setinterval/3-rewrite-settimeout/task.md

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+importance: 4
+
+---
+
+# Rewrite setTimeout with setInterval
+
+Here's the function that uses nested `setTimeout` to split a job into pieces.
+
+Rewrite it to `setInterval`:
+
+```js run
+let i = 0;
+
+let start = Date.now();
+
+function count() {
+
+  if (i == 1000000000) {
+    alert("Done in " + (Date.now() - start) + 'ms');
+  } else {
+    setTimeout(count, 0);
+  }
+
+  // a piece of heavy job
+  for(let j = 0; j < 1000000; j++) {
+    i++;
+  }
+
+}
+
+count();
+```