So the textbook definition of the Observer Pattern is
Observer Pattern: defines a one-to-many dependecy between objects so that when one object changes state, all of its dependents are notified and updated automatically
The subject and observers define a one-to-many relationshp. Observers are dependent on the subject such that when the subject's state changes, observers are notified. Here is the UML diagram of our program
In this program, the WeatherData object updates CurrentConditionsDisplay which results in a print statement that states the temperature and humidity upon receiving an update from the observer.
To build the program, go inside the ObserverPattern directory.
Install dependencies
yarn install
Build typescript
yarn run build
Run command to start
yarn run start