finish 4

react/4/seasons/src/index.js

@@ -6,18 +6,29 @@ class App extends React.Component {
     // specific to JS not to React
     constructor(props) {
         super(props)
-        this.state = { lat: null }
+        this.state = { lat: null, errorMessage: '' }
 
         window.navigator.geolocation.getCurrentPosition(
             postion => {
                 this.setState({ lat: postion.coords.latitude })
             },
-            err => console.log(err)
+            err => {
+                this.setState({ errorMessage: err.message })
+            }
         )
     }
 
     render() {
-        return <div>Latitude: {this.state.lat}</div>
+
+        if (this.state.errorMessage && !this.state.lat) {
+            return <div>Error: {this.state.errorMessage}</div>
+        }
+
+        if (!this.state.errorMessage && this.state.lat) {
+            return <div>Latiture: {this.state.lat}</div>
+        }
+
+        return <div>Loading...</div>
     }
 }
 ReactDOM.render(