exposing library level private vars in Dart

// ref – https://stackoverflow.com/questions/17488611/how-to-create-private-variables-in-dart/17488825

There is no private, public, protected in Dart. However we use _ to hide data at the library level, and then use getter and setters to expose these data.

In our example, we declare _balance to be a library level private variable.
We expose this to the world through getter balance.

class BankAccount {

BankAccount(this._balance);

double _balance; // library level privacy

String get balance => 'Your balance is: $_balance';

void deposit(double amount) {

_balance += amount;

}

void withdraw(double amount) {

if (_balance > amount) {

_balance -= amount;

}

import 'BankAccount.dart';

void main() {

final ba = BankAccount(100);

print(ba.balance);

ba.deposit(243);

print(ba.balance);

}