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+### CountDown
+
+Renders a countdown timer that prints a message when it reaches zero.
+
+Use object destructuring to set defaults for the `hours`, `minutes` and `seconds` props.
+Use the `React.useState()` hook to create the `time`, `paused` and `over` state variables and set their values to the values of the passed props, `false` and `false` respectively.
+Create a method `tick`, that updates the value of `time` based on the current value (i.e. decreasing the time by one second).
+If `paused` or `over` is `true`, `tick` will return immediately.
+Create a method `reset`, that resets all state variables to their initial states.
+Use the the `React.useEffect()` hook to call the `tick` method every second via the use of `setInterval()` and use `clearInterval()` to cleanup when the component is unmounted.
+Use a `<div>` to wrap a `<p>` element with the textual representation of the components `time` state variable, as well as two `<button>` elements that will pause/unpause and restart the timer respectively.
+If `over` is `true`, the timer will display a message instead of the value of `time`.
+
+```jsx
+function CountDown({ hours = 0, minutes = 0, seconds = 0 }) {
+  const [paused, setPaused] = React.useState(false);
+  const [over, setOver] = React.useState(false);
+  const [time, setTime] = React.useState({
+    hours: parseInt(hours),
+    minutes: parseInt(minutes),
+    seconds: parseInt(seconds)
+  });
+
+  const tick = () => {
+    if (paused || over) return;
+    if (time.hours == 0 && time.minutes == 0 && time.seconds == 0)
+      setOver(true);
+    else if (time.minutes == 0 && time.seconds == 0)
+      setTime({
+        hours: time.hours - 1,
+        minutes: 59,
+        seconds: 59
+      });
+    else if (time.seconds == 0)
+      setTime({
+        hours: time.hours,
+        minutes: time.minutes - 1,
+        seconds: 59
+      });
+    else
+      setTime({
+        hours: time.hours,
+        minutes: time.minutes,
+        seconds: time.seconds - 1
+      });
+  };
+
+  const reset = () => {
+    setTime({
+      hours: parseInt(hours),
+      minutes: parseInt(minutes),
+      seconds: parseInt(seconds)
+    });
+    setPaused(false);
+    setOver(false);
+  };
+
+  React.useEffect(() => {
+    let timerID = setInterval(() => tick(), 1000);
+    return () => clearInterval(timerID);
+  });
+
+  return (
+    <div>
+      <p>{`${time.hours
+        .toString()
+        .padStart(2, "0")}:${time.minutes
+        .toString()
+        .padStart(2, "0")}:${time.seconds.toString().padStart(2, "0")}`}</p>
+      <div>{over ? "Time's up!" : ""}</div>
+      <button onClick={() => setPaused(!paused)}>
+        {paused ? "Resume" : "Pause"}
+      </button>
+      <button onClick={() => reset()}>Restart</button>
+    </div>
+  );
+}
+```
+
+```jsx
+ReactDOM.render(
+  <CountDown hours="1" minutes="45" />,
+  document.getElementById('root')
+);
+```
+
+<!-- tags: visual,state -->
+
+<!-- expertise: 2 -->