How can I create a variable in a service that gets its data from a promise yet is shared between two components?

Question

I have a service in an Angular 2 using TypeScript. I want to be able to share an array of values that I get from that service. when one component makes a change to the array

Answer 1

In your component

//set favorites
    getFavorites(): void{
        this.favoriteService
            .getFavorites()
            .then(favorites => this.favoriteService.favorites = favorites);
    }  

// get favorite
this.favorites = this.favoriteService.favorites;//access it from service