How does map((word) => word && '🇵🇰').join(' ') actually working ? well I know how the map works but why 'word && '🇵🇰' is needed. Because if I remove the word with && then the flag already appeared before any text. While if this same code sample execute then only flag will be appeared only if the word is typed in the Textview. Can you enlighten m…

TextviewButton.js

import React from 'react';
import { StyleSheet, Text, View, TextInput, Alert, Button, FlatList, Image } from 'react-native';
import { ViewPagerAndroid } from 'react-native-gesture-handler';

let dumiDataArray = [{ key: 'Badar' },
{ key: 'Khan' },
{ key: 'Badri' },
{ key: 'Sudo' },
{ key: 'Kaka' },
{ key: 'Khan' },
{ key: 'Shahzad' },
{ key: 'Badri' },
{ key: 'Jadi' },
{ key: 'Badar Khan' },
{ key: 'Badar Shahzad' },
{ key: 'Badar Shahzad Khan' },
{ key: 'badarshahzad54' },
{ key: 'badarshahzad' },
{ key: 'badarkhan634' },
{ key: 'badar2014' },
{ key: 'B.S.K@bradford.edu.uk' },
{ key: 'Badi' },
{ key: 'Badar' },
{ key: 'Khan' },
{ key: 'Badri' },
{ key: 'Sudo' },
{ key: 'Kaka' },
{ key: 'Khan' },
{ key: 'Shahzad' },
{ key: 'Badri' },
{ key: 'Jadi' },
{ key: 'Badar Khan' },
{ key: 'Badar Shahzad' },
{ key: 'Badar Shahzad Khan' },
{ key: 'badarshahzad54' },
{ key: 'badarshahzad' },
{ key: 'badarkhan634' },
{ key: 'badar2014' },
{ key: 'B.S.K@bradford.edu.uk' },
{ key: 'Khan' },
{ key: 'Badri' },
{ key: 'Sudo' },
{ key: 'Kaka' },
{ key: 'Khan' },
{ key: 'Shahzad' },
{ key: 'Badri' },
{ key: 'Jadi' },
{ key: 'Badar Khan' },
{ key: 'Badar Shahzad' },
{ key: 'Badar Shahzad Khan' },
{ key: 'badarshahzad54' },
{ key: 'badarshahzad' },
{ key: 'badarkhan634' },
{ key: 'badar2014' },
{ key: 'B.S.K@bradford.edu.uk' },
{ key: 'Badi' },
{ key: 'Badar' },
{ key: 'Khan' },
{ key: 'Badri' },
{ key: 'Sudo' },
{ key: 'Kaka' },
{ key: 'Khan' },
{ key: 'Shahzad' },
{ key: 'Badri' },
{ key: 'Jadi' },
{ key: 'Badar Khan' },
{ key: 'Badar Shahzad' },
{ key: 'Badar Shahzad Khan' },
{ key: 'badarshahzad54' },
{ key: 'badarshahzad' },
{ key: 'badarkhan634' },
{ key: 'badar2014' },
{ key: 'B.S.K@bradford.edu.uk' },
{ key: 'Khan' },
{ key: 'Badri' },
{ key: 'Sudo' },
{ key: 'Kaka' },
{ key: 'Khan' },
{ key: 'Shahzad' },
{ key: 'Badri' },
{ key: 'Jadi' },
{ key: 'Badar Khan' },
{ key: 'Badar Shahzad' },
{ key: 'Badar Shahzad Khan' },
{ key: 'badarshahzad54' },
{ key: 'badarshahzad' },
{ key: 'badarkhan634' },
{ key: 'badar2014' },
{ key: 'B.S.K@bradford.edu.uk' },
{ key: 'Badi' },
{ key: 'Badar' },
{ key: 'Khan' },
{ key: 'Badri' },
{ key: 'Sudo' },
{ key: 'Kaka' },
{ key: 'Khan' },
{ key: 'Shahzad' },
{ key: 'Badri' },
{ key: 'Jadi' },
{ key: 'Badar Khan' },
{ key: 'Badar Shahzad' },
{ key: 'Badar Shahzad Khan' },
{ key: 'badarshahzad54' },
{ key: 'badarshahzad' },
{ key: 'badarkhan634' },
{ key: 'badar2014' },
{ key: 'B.S.K@bradford.edu.uk' },
{ key: 'Khan' },
{ key: 'Badri' },
{ key: 'Sudo' },
{ key: 'Kaka' },
{ key: 'Khan' },
{ key: 'Shahzad' },
{ key: 'Badri' },
{ key: 'Jadi' },
{ key: 'Badar Khan' },
{ key: 'Badar Shahzad' },
{ key: 'Badar Shahzad Khan' },
{ key: 'badarshahzad54' },
{ key: 'badarshahzad' },
{ key: 'badarkhan634' },
{ key: 'badar2014' },
{ key: 'B.S.K@bradford.edu.uk' },
{ key: 'Badi' },
{ key: 'Badar' },
{ key: 'Khan' },
{ key: 'Badri' },
{ key: 'Sudo' },
{ key: 'Kaka' },
{ key: 'Khan' },
{ key: 'Shahzad' },
{ key: 'Badri' },
{ key: 'Jadi' },
{ key: 'Badar Khan' },
{ key: 'Badar Shahzad' },
{ key: 'Badar Shahzad Khan' },
{ key: 'badarshahzad54' },
{ key: 'badarshahzad' },
{ key: 'badarkhan634' },
{ key: 'badar2014' },
{ key: 'B.S.K@bradford.edu.uk' },
{ key: 'Khan' },
{ key: 'Badri' },
{ key: 'Sudo' },
{ key: 'Kaka' },
{ key: 'Khan' },
{ key: 'Shahzad' },
{ key: 'Badri' },
{ key: 'Jadi' },
{ key: 'Badar Khan' },
{ key: 'Badar Shahzad' },
{ key: 'Badar Shahzad Khan' },
{ key: 'badarshahzad54' },
{ key: 'badarshahzad' },
{ key: 'badarkhan634' },
{ key: 'badar2014' },
{ key: 'Khan' },
{ key: 'Badri' },
{ key: 'Sudo' },
{ key: 'Kaka' },
{ key: 'Khan' },
{ key: 'Shahzad' },
{ key: 'Badri' },
{ key: 'Jadi' },
{ key: 'Badar Khan' },
{ key: 'Badar Shahzad' },
{ key: 'Badar Shahzad Khan' },
{ key: 'badarshahzad54' },
{ key: 'badarshahzad' },
{ key: 'badarkhan634' },
{ key: 'badar2014' },
{ key: 'B.S.K@bradford.edu.uk' },
{ key: 'Badi' },
{ key: 'Badar' },
{ key: 'Khan' },
{ key: 'Badri' },
{ key: 'Sudo' },
{ key: 'Kaka' },
{ key: 'Khan' },
{ key: 'Shahzad' },
{ key: 'Badri' },
{ key: 'Jadi' },
{ key: 'Badar Khan' },
{ key: 'Badar Shahzad' },
{ key: 'Badar Shahzad Khan' },
{ key: 'badarshahzad54' },
{ key: 'badarshahzad' },
{ key: 'badarkhan634' },
{ key: 'badar2014' },
{ key: 'B.S.K@bradford.edu.uk' },
{ key: 'Khan' },
{ key: 'Badri' },
{ key: 'Sudo' },
{ key: 'Kaka' },
{ key: 'Khan' },
{ key: 'Shahzad' },
{ key: 'Badri' },
{ key: 'Jadi' },
{ key: 'Badar Khan' },
{ key: 'Badar Shahzad' },
{ key: 'Badar Shahzad Khan' },
{ key: 'badarshahzad54' },
{ key: 'badarshahzad' },
{ key: 'badarkhan634' },
{ key: 'badar2014' },
{ key: 'B.S.K@bradford.edu.uk' },
{ key: 'Badi' },
{ key: 'Badar' },
{ key: 'Khan' },
{ key: 'Badri' },
{ key: 'Sudo' },
{ key: 'Kaka' },
{ key: 'Khan' },
{ key: 'Shahzad' },
{ key: 'Badri' },
{ key: 'Jadi' },
{ key: 'Badar Khan' },
{ key: 'Badar Shahzad' },
{ key: 'Badar Shahzad Khan' },
{ key: 'badarshahzad54' },
{ key: 'badarshahzad' },
{ key: 'badarkhan634' },
{ key: 'badar2014' },
{ key: 'B.S.K@bradford.edu.uk' },
{ key: 'Khan' },
{ key: 'Badri' },
{ key: 'Sudo' },
{ key: 'Kaka' },
{ key: 'Khan' },
{ key: 'Shahzad' },
{ key: 'Badri' },
{ key: 'Jadi' },
{ key: 'Badar Khan' },
{ key: 'Badar Shahzad' },
{ key: 'Badar Shahzad Khan' },
{ key: 'badarshahzad54' },
{ key: 'badarshahzad' },
{ key: 'badarkhan634' },
{ key: 'badar2014' },
{ key: 'B.S.K@bradford.edu.uk' },
{ key: 'Badi' },
{ key: 'Badar' },
{ key: 'Khan' },
{ key: 'Badri' },
{ key: 'Sudo' },
{ key: 'Kaka' },
{ key: 'Khan' },
{ key: 'Shahzad' },
{ key: 'Badri' },
{ key: 'Jadi' },
{ key: 'Badar Khan' },
{ key: 'Badar Shahzad' },
{ key: 'Badar Shahzad Khan' },
{ key: 'badarshahzad54' },
{ key: 'badarshahzad' },
{ key: 'badarkhan634' },
{ key: 'badar2014' },
{ key: 'B.S.K@bradford.edu.uk' },
{ key: 'B.S.K@bradford.edu.uk' },
{ key: 'Badi' },
{ key: 'Badar' },
{ key: 'Khan' },
{ key: 'Badri' },
{ key: 'Sudo' },
{ key: 'Kaka' },
{ key: 'Khan' },
{ key: 'Shahzad' },
{ key: 'Badri' },
{ key: 'Jadi' },
{ key: 'Badar Khan' },
{ key: 'Badar Shahzad' },
{ key: 'Badar Shahzad Khan' },
{ key: 'badarshahzad54' },
{ key: 'badarshahzad' },
{ key: 'badarkhan634' },
{ key: 'badar2014' },
{ key: 'B.S.K@bradford.edu.uk' },
{ key: 'Badi' },
]


export default class App extends React.Component {
  constructor(props) {
    super(props);
    this.state = { text: '' };
  }

  // [1] Emoji  : http://flagpedia.net/emoji
  // [2] Library: https://github.com/frostney/react-native-flags
  render() {
    return (

      <ViewPagerAndroid initialPage={0} style={styles.container}>
        <View key="1" style={styles.viewPager0}>
          <TextInput style={styles.textInput} placeholder="Type here to translater" onChangeText={(text) => this.setState({ text })} />

          <Text style={{ padding: 10, fontSize: 42 }}>
            {this.state.text.split(' ').map((word) =>  word && '🇵🇰').join(' ')}
          </Text>

          <Button
            onPress={() => { dumiDataArray.unshift(this.text) }}
            title='Submit' />

          <FlatList style={styles.flatList}
            data={dumiDataArray}
            renderItem={({ item }) => {

              return (
                <View style={styles.itemView}>
                  <Image source={require('./img/6.jpg')} style={styles.imgStyle} />
                  <Text style={styles.textView}> {item.key}</Text>
                </View>
              );

            }
            }
          />
        </View>
        <View key="2">
        </View>
      </ViewPagerAndroid>
    );
  }
}

const styles = StyleSheet.create({
  container: {
    flex: 1,
    backgroundColor: '#fff',
    padding: 10,
  },
  viewPager0:{
    padding:16,
  },
  textInput: {
    padding: 10,
    marginTop: 10,

    height: 40,
    fontSize: 18,
  },
  flatList: {
    padding: 10,
  },
  textView: {
    paddingStart: 16,
    paddingTop: 8,
    fontSize: 14,
    // height: 44,
  },
  itemView: {
    flex: 1,
    flexDirection: 'row',
    justifyContent: 'flex-start',
    height: 42,
    margin: 16,
  },
  imgStyle: {

    width: 48,
    height: 48,
    borderRadius: 150 / 2
  },

});