AngularJS Essentials

Chapter 4
Creating services with the provider
Sometimes, it might be interesting to create configurable services. They are called
providers, and despite being more complex to create, they can be configured before
being available to be injected inside other components.
While the factory works by returning an object and the service with the
constructor function, the provider relies on the $get function to expose its
behavior. This way, everything returned by this function becomes available
through the dependency injection.
In the following code, we refactored our service to be implemented by a provider.
Inside the $get function, the calculateTicket method is being returned and will be
accessible externally.
services.js
parking.provider("parkingService", function (parkingConfig) {
var _parkingRate = parkingConfig.parkingRate;
var _calculateTicket = function (car) {
var departHour = new Date().getHours();
var entranceHour = car.entrance.getHours();
var parkingPeriod = departHour – entranceHour;
var parkingPrice = parkingPeriod * _parkingRate;
return {
period: parkingPeriod,
price: parkingPrice
};
};
this.setParkingRate = function (rate) {
_parkingRate = rate;
};
this.$get = function () {
return {
calculateTicket: _calculateTicket
};
};
});
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