JAVASCRIPT

angular store select method

// In very simple terms select gives you back a slice of data 
// from the application state wrapped into an Observable.
// What it means is, select operator gets the chunk of data you need 
// and then it converts it into an Observable object. 
// So, what you get back is an Observable that wraps the required data. 
// To consume the data you need to subscribe to it.
// Lets see a very basic example.
// Lets define the model of our store

export interface AppStore {
   clock: Date
}

// Import the Store into your component from '@ngrx/store'
// Create a store by injecting into the constructor

constructor(private _store: Store<AppStore>){}

// Select returns an Observable.
// So, declare the clock variable in your component as follows:-

public clock: Observable<Date>;

// Now you can do something like follows:-

this.clock = this._store.select('clock');