Angular 2 Example with Promise.resolve


Example

services/my.service.ts

import { Injectable } from '@angular/core';

@Injectable()
export class MyService {
    data: any = [1, 2, 3];

    getData() {
        return Promise.resolve(this.data);
    }
}

getData() now acts likes a REST call that creates a Promise, which gets resolved immediately. The results can be handheld inside .then() and errors can also be detected. This is good practice and convention for asynchronous methods.

components/my.component.ts

import { Component, OnInit } from '@angular/core';
import { MyService } from '../services/my.service';

@Component({...})
export class MyComponent implements OnInit {
    data: any[];
    // Creates private variable myService to use, of type MyService
    constructor(private myService: MyService) { }

    ngOnInit() {
        // Uses an "arrow" function to set data
        this.myService.getData().then(data => this.data = data);
    }
}