It also resembles the pub / sub and event driven design patterns that seasoned developers may be familiar with. It delivers a declarative and functional (non mutating) implementation which makes debugging the state of the application much easier. RxJs in conjunction with NgRx is a powerful way to maintain state in an application. The selectors are memoized to help with application performance. Selectors can take parts of the entire store and expose those slices of state. Selectors are subscribers to the state store that emit (or publish) an event that other parts of the application can subscribe to. This allows for us to have an audit trail of events in the application to get a historical representation of the state of the application at any given point. Instead, it creates a new state store with the updated data from the action. An important piece to a reducer is that it does NOT mutate the state store. The difference between an effect and a reducer is that it updates the state store object by creating a new state store object when an action is dispatched (or published) with new data. Reducers are another subscriber to actions. This is useful when you want an effect to open / dismiss a modal or spinner. The dispatch: false tells our application that we are not dispatching an action from the effect. ` }) constructor ( private _jokesHttpSvc : JokesHttpService, private _authorsHttpSvc : AuthorsHttpService )`, otherwise your browser will get very mad at you.
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