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+### CountDown
+
+Renders a countdown timer that prints a message when it reaches zero.
+
+- The timer starts automatically with the initial value passed through the `props`
+- Each second, `tick()` is called. It updates the timer, decreasing the time by one second each time.
+- If the `pause` button is clicked, `tick()` refrains from updating the time until the `resume` button is clicked.
+- If the `restart` button is clicked, the timer starts over from step 1
+- If the time hits zero, the message 'Time's up!' is printed
+
+```jsx
+class CountDown extends React.Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      paused: false,
+      done: false,
+      s: parseInt(this.props.seconds),
+      m: parseInt(this.props.minutes),
+      h: parseInt(this.props.hours)
+    };
+
+    this.tick = this.tick.bind(this);
+    this.pause = this.pause.bind(this);
+    this.reset = this.reset.bind(this);
+
+    this.timerID = setInterval(this.tick, 1000);
+  }
+
+  tick() {
+    if (this.state.paused) {
+      return;
+    }
+
+    if (this.state.s === 0 && this.state.m === 0 && this.state.h === 0) {
+      clearInterval(this.timerID);
+      this.setState({
+        done: true
+      });
+    } else if (this.state.m === 0 && this.state.s === 0) {
+      this.setState(state => ({
+        h: state.h - 1,
+        m: 59,
+        s: 59
+      }));
+    } else if (this.state.s === 0) {
+      this.setState(state => ({
+        m: state.m - 1,
+        s: 59
+      }));
+    } else {
+      this.setState(state => ({
+        s: state.s - 1
+      }))
+    }
+  }
+
+  pause() {
+    this.setState(state => ({
+      paused: !state.paused
+    }))
+  }
+
+  reset() {
+    clearInterval(this.timerID);
+    this.setState({
+      paused: false,
+      done: false,
+      s: parseInt(this.props.seconds),
+      m: parseInt(this.props.minutes),
+      h: parseInt(this.props.hours)
+    });
+    this.timerID = setInterval(this.tick, 1000);
+  }
+
+  render() {
+    return (
+      <div>
+        <h1>{this.state.h.toString().padStart(2, '0') + ':' + this.state.m.toString().padStart(2, '0') + ':' + this.state.s.toString().padStart(2, '0')}</h1>
+        <button onClick={this.pause}>{this.state.paused ? 'RESUME' : 'PAUSE'}</button>
+        <button onClick={this.reset}>RESTART</button>
+        <h1>{this.state.done ? "Time's up!" : ''}</h1>
+      </div>
+    )
+  }
+}
+```
+
+```jsx
+ReactDOM.render(
+  <CountDown hours="1" minutes="45" seconds="0" />,
+  document.getElementById('root')
+);
+```