Wallet.js (PoC)

wallet.js

  app.service('Wallet', function () {
    function Wallet () {
      this.total = 0;
    }

    Wallet.prototype.add = function (amount) {
      this.total += Number(amount) || 0;
      return this.total;
    };

    return Wallet;
  });


  app.service('WalletWithStorage', ['Wallet', function (Wallet) {
    function WalletWithStorage () {
      this.wallet = new Wallet();
    }

    WalletWithStorage.prototype.add = function (amount) {
      this.wallet.add(amount);
      localStorage.add(/* sth */);
      return this.wallet.total;
    };

    return WalletWithStorage;
  }]);

   app.controller('WalletController', ['$scope', 'WalletWithStorage', function ($scope, WalletWithStorage) {
     var wallet = new WalletWithStorage();

     $scope.add = function () {
      wallet.add(/* sth */);
     };
   }]);