react native conditional rendering

render(){
  return(
    <View>
      {this.state.error && <Text style={{ color: 'red' }}>{this.state.errorMessage}</Text>}
      <Text>Hello World!</Text>
    </View>
  );
}

There you go.

This below code also check empty string.

render(){
  return(
    <View>
    {!!this.state.error && <Text>{this.state.errorMessage}</Text>}
    </View>
  );
}