### Callbacks (getting a response from js)

#### React

```js
// index.ios.js
videoPlayer.seekTo(100, (error, someData) => {
  if (error) {
    console.error(error)
  } else {
    console.log(someData)
  }
})

// index.android.js
videoPlayer.seekTo(
  100, 
  (msg) => {
    console.error(msg)
  }, 
  (someData) => {
    console.log(someData)
  }
)
```

#### iOS

[docs](http://facebook.github.io/react-native/releases/next/docs/native-modules-ios.html#callbacks)

```obj-c
RCT_EXPORT_METHOD(seekTo:(double)time callback:(RCTResponseSenderBlock)callback)
{
  NSArray *someData;
  callback(@[[NSNull null], someData]); // (error, someData) in js
}
```

#### Android

[docs](http://facebook.github.io/react-native/releases/next/docs/native-modules-android.html#callbacks)

```java
@ReactMethod
public void seekTo(double time, Callback errorCallback, Callback successCallback) {
  try {
    successCallback.invoke(someData);
  } catch (Exception e) {
    errorCallback.invoke(e.getMessage());
  }
}
```

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