Http get de tareas y filtro por atributo "important"

home.html

<p><strong>Importantes: </strong><span *ngIf="postsFilter">{{ postsFilter.length }}</span></p>

  <ion-list>
    <ion-item no-padding *ngFor="let post of posts">
        <!-- {{ post.description }} -->
        <span *ngFor="let item of post.tags">#{{ item.name }} </span>
    </ion-item>
  </ion-list>

home.ts

import { Component } from '@angular/core';
import { NavController } from 'ionic-angular';
import { Http } from '@angular/http';
import 'rxjs/add/operator/map';

@Component({
  selector: 'page-home',
  templateUrl: 'home.html'
})
export class HomePage {

    posts: any;
    postsFilter: any;

    constructor(
        public navCtrl: NavController,
        public http: Http
    ) {
        this.getData();
    }

    // get tasks
    async getData(){
        try {
            this.http.get('http://service.dominio.com/task')
                .map(res => res.json())
                .subscribe(data => {
                    this.posts = data;
                    // filtro items con atributos important
                    this.postsFilter = this.posts.filter((filtro)=>{
                        return filtro.important == true;
                    });
                });
        } catch (e) {
            console.error(e);
        }
    }
}