Update Ticker

snippets/Ticker.md

@@ -2,45 +2,37 @@
 
 Renders a ticker component.
 
-- The ticker state is initially set to zero 
-- When the `Tick!` button is clicked, `timer` is incremented periodically at the given `interval`
-- When the `Reset` button is clicked, the value of the timer is set to zero and the `setInterval` is cleared
-- The `setInterval` is cleared once the desired `time` is reached
-- `time` and `interval` are the required props
+Use the `React.useState()` hook to initialize the `ticker` state variable to `0`.
+Define two methods, `tick` and `reset`, that will periodically increment `timer` based on `interval` and reset `interval` respectively.
+Return a `<div>` with two `<button>` elements, each of which calls `tick` and `reset` respectively.
 
 ```jsx
-class Ticker extends Component {
-	constructor(props) {
-		super(props);
-		this.state = {ticker: 0}
-		this.interval = null
-	}
+function Ticker(props) {
+  const [ticker, setTicker] = React.useState(0);
+  let interval = null;
 
-	tick = () => {
-		this.reset()
-		this.interval = setInterval(() => {
-			if (this.state.ticker < this.props.times) {
-				this.setState(({ ticker }) => ({ticker: ticker + 1}))
-			}else{
-				clearInterval(this.interval)
-			}
-		}, this.props.interval)
-	}
+  const tick = () => {
+    reset();
+    interval = setInterval(() => {
+      if (ticker < props.times) 
+        setTicker(ticker + 1);
+      else 
+        clearInterval(interval);
+    }, props.interval);
+  }
 
-	reset = () => {
-		this.setState({ticker: 0})
-		clearInterval(this.interval)
-	}
+  const reset = () => {
+    setTicker(0);
+    clearInterval(interval);
+  }
 
-	render() {
-		return (
-			<div>
-				<span style={{fontSize: 100}}>{this.state.ticker}</span>       
-				<button onClick={this.tick}>Tick!</button>
-				<button onClick={this.reset}>Reset</button>
-			</div>
-		);
-	}
+  return (
+    <div>
+      <span style={{ fontSize: 100 }}>{this.state.ticker}</span>
+      <button onClick={this.tick}>Tick!</button>
+      <button onClick={this.reset}>Reset</button>
+    </div>
+  );
 }
 ```