How to set initial value of React Native Picker to empty

In this React Native source code example, the source code below illustrate how to set initial value of React Native Picker to empty.

You can copy and adopt this source code example to your React Native project without reinventing the wheel.

import React, { Component } from 'react';
import { View, StyleSheet } from 'react-native'
import ModalDropdown from 'react-native-modal-dropdown';

export default class App extends Component {
   render() {
      return (
         <View style={styles.container}>
            <ModalDropdown
              defaultValue=" "
              options={['option 1', 'option 2','option 3','option 4']}
              dropdownTextStyle={{width:300,backgroundColor: '#fff',fontSize:17}}/*Style here*/
              style={{width: '60%', backgroundColor:'#fff'}}
              textStyle={{fontSize: 20,margin: 10,}}
              dropdownStyle={{width: '60%'}}
               />
         </View>
      )
   }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    alignItems: 'center',
    justifyContent: 'center',
    backgroundColor: '#ddd'
  },
})

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