How to use

latitude

function

in

Array

render() {
  return (
   <View style={styles.container}>
    {this.state.region.latitude ?
     <MapView
      provider={this.props.provider}
      style={styles.map}
      initialRegion={this.state.region}>
      {this.getMarkers()}
     </MapView>
     : null}
   </View>
  );
 }