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+### StarRating
+
+Renders a star rating component.
+
+Use the value of the `rating` prop to determine if a valid rating is supplied and store it in `state.rating` (or `0` if invalid or not supplied).
+Initialize `state.selection` to `0`.
+Create two methods, `hoverOver` and `setRating`, that take a number as argument and update `state.selected` and `state.rating` according to it, bind them both to the component's context.
+
+
+In the `render()` method, define a functional component, called `Star` that will render each individual star with the appropriate appearance, based on the parent component's `state`, and handle its `onMouseEnter` and `onClick` events, using the parent component's `hoverOver` and `setRating` methods.
+Render a `<div>` to wrap the `<Star>` components, which are created using `Array.prototype.map` on an array of 5 elements, created using `Array.from`, and handle the `onMouseLeave` event to set `state.selection` to `0`. 
+Finally, pass the appropriate values to each `<Star>` component (`starId`, `marked`, `onHover` and `setRating`).
+
+```jsx
+class StarRating extends React.Component {
+  constructor(props) {
+    super(props);
+    this.state = {
+      rating: typeof props.rating == 'number' ? props.rating : 0,
+      selection: 0
+    };
+    this.hoverOver = this.hoverOver.bind(this);
+    this.setRating = this.setRating.bind(this);
+  }
+
+  hoverOver(val) {
+    this.setState(state => ({ selection: val }));
+  }
+
+  setRating(val) {
+    this.setState(state => ({ rating: val }));
+  }
+
+  render() {
+    function Star({ marked, starId, onHover, onRate }) {
+      return (
+        <span
+          star-id={starId}
+          style={{ color: '#ff9933' }}
+          onClick={() => onRate(starId)}
+          onMouseEnter={() => onHover(starId)}
+        >
+          {marked ? '\u2605' : '\u2606'}
+        </span>
+      );
+    }
+    return (
+      <div onMouseOut={() => this.hoverOver(0)}>
+        {Array.from({ length: 5 }, (v, i) => i + 1).map(v => (
+          <Star
+            starId={v}
+            key={`star_${v}`}
+            marked={
+              this.state.selection
+                ? this.state.selection >= v
+                : this.state.rating >= v
+            }
+            onHover={this.hoverOver}
+            onRate={this.setRating}
+          />
+        ))}
+      </div>
+    );
+  }
+}
+```
+
+```jsx
+ReactDOM.render(<StarRating/>, document.getElementById('root'));
+ReactDOM.render(<StarRating rating={2} />, document.getElementById('root'));
+```
+
+<!-- tags: visual,children,input,state,class -->
+
+<!-- expertise: 2 -->