refactoring, modules

1-js/09-async/02-promise-basics/02-delay-promise/solution.md

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+```js run
+function delay(ms) {
+  return new Promise(resolve => setTimeout(resolve, ms));
+}
+
+delay(3000).then(() => alert('runs after 3 seconds'));
+```
+
+Please note that in this task `resolve` is called without arguments. We don't return any value from `delay`, just ensure the delay.

1-js/09-async/02-promise-basics/02-delay-promise/task.md

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+
+# Delay with a promise
+
+The built-in function `setTimeout` uses callbacks. Create a promise-based alternative.
+
+The function `delay(ms)` should return a promise. That promise should resolve after `ms` milliseconds, so that we can add `.then` to it, like this:
+
+```js
+function delay(ms) {
+  // your code
+}
+
+delay(3000).then(() => alert('runs after 3 seconds'));
+```