Sort by and group by displayed in html with lines

<!DOCTYPE html>
<html>

  <head>
    <base href="." />
    <title>angular2 playground</title>
    <link rel="stylesheet" href="style.css" />
    <script src="https://unpkg.com/core-js@2.4.1/client/shim.min.js"></script>
    <script src="https://unpkg.com/zone.js/dist/zone.js"></script>
    <script src="https://unpkg.com/zone.js/dist/long-stack-trace-zone.js"></script>
    <script src="https://unpkg.com/reflect-metadata@0.1.3/Reflect.js"></script>
    <script src="https://unpkg.com/systemjs@0.19.31/dist/system.js"></script>
    <script src="config.js"></script>
    <script>
    System.import('app')
      .catch(console.error.bind(console));
  </script>
  </head>

  <body>
    <my-app>
    loading...
  </my-app>
  </body>

</html>

/* Styles go here */

### Angular Starter Plunker - Typescript

System.config({
  //use typescript for compilation
  transpiler: 'typescript',
  //typescript compiler options
  typescriptOptions: {
    emitDecoratorMetadata: true
  },
  paths: {
    'npm:': 'https://unpkg.com/'
  },
  //map tells the System loader where to look for things
  map: {
    
    'app': './src',
    
    '@angular/core': 'npm:@angular/core/bundles/core.umd.js',
    '@angular/common': 'npm:@angular/common/bundles/common.umd.js',
    '@angular/compiler': 'npm:@angular/compiler/bundles/compiler.umd.js',
    '@angular/platform-browser': 'npm:@angular/platform-browser/bundles/platform-browser.umd.js',
    '@angular/platform-browser-dynamic': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic.umd.js',
    '@angular/http': 'npm:@angular/http/bundles/http.umd.js',
    '@angular/router': 'npm:@angular/router/bundles/router.umd.js',
    '@angular/forms': 'npm:@angular/forms/bundles/forms.umd.js',
    
    '@angular/core/testing': 'npm:@angular/core/bundles/core-testing.umd.js',
    '@angular/common/testing': 'npm:@angular/common/bundles/common-testing.umd.js',
    '@angular/compiler/testing': 'npm:@angular/compiler/bundles/compiler-testing.umd.js',
    '@angular/platform-browser/testing': 'npm:@angular/platform-browser/bundles/platform-browser-testing.umd.js',
    '@angular/platform-browser-dynamic/testing': 'npm:@angular/platform-browser-dynamic/bundles/platform-browser-dynamic-testing.umd.js',
    '@angular/http/testing': 'npm:@angular/http/bundles/http-testing.umd.js',
    '@angular/router/testing': 'npm:@angular/router/bundles/router-testing.umd.js',
    
    'rxjs': 'npm:rxjs',
    'typescript': 'npm:typescript@2.0.2/lib/typescript.js'
  },
  //packages defines our app package
  packages: {
    app: {
      main: './main.ts',
      defaultExtension: 'ts'
    },
    rxjs: {
      defaultExtension: 'js'
    }
  }
});

//main entry point
import {platformBrowserDynamic} from '@angular/platform-browser-dynamic';
import {AppModule} from './app';

platformBrowserDynamic().bootstrapModule(AppModule)

//our root app component
import {Component, NgModule} from '@angular/core'
import {BrowserModule} from '@angular/platform-browser'
import { Pipe, PipeTransform } from '@angular/core'
import 'rxjs/Rx';

@Pipe({
  name: 'sort-by-date'
})
export class SortByDatePipe implements PipeTransform {
  transform(groupedItems: any, date: any): any {
    groupedItems.sort((a: any, b: any) => {
      if (a[date] < b[date]) {
        return -1;
      } else if (a[date] > b[date]) {
        return 1;
      } else {
        return 0;
      }
    });
    return groupedItems;
  }
}

@Component({
  selector: 'my-app',
  template: `
    <div>
      <h2>Hello</h2>
      <div *ngFor="let item of filteredItems">
        {{item.name}}
      </div>
    </div>
  `,
})
export class App {
  items:Array<any> = [
    {name: "bana", link: "https://wiki.com/what-ever/mmmmmmmmm/mdmdm", date: "Sat, 28 Jan 2017 11:45:52 +0000"},
    {name: "orange", link: "http://google.com/what-ever/mmmmmmmmm/mdmdm", date: "Sat, 28 Jan 2017 05:39:32 +0000"},
    {name: "apple", link: "https://ask.com/what-ever/mmmmmmmmm/mdmdm", date: "Sat, 28 Jan 2017 03:38:47 +0000"},
    {name: "pear", link: "http://duckduckgo.com/what-ever/mmmmmmmmm/mdmdm", date: "Sat, 28 Jan 2017 02:20:15 +0000"},
    {name: "ora", link: "http://google.com/what-ever/nnnnnnnnnnnnnnnn", date: "Sat, 28 Jan 2017 02:00:23 +0000"},
    {name: "grape", link: "http://www.isearch.com/what-ever/mmmmmmmmm", date: "Sat, 28 Jan 2017 01:20:43 +0000"},
    {name: "ap", link: "https://ask.com/what-ever/mvvvvvvvvvvvvvvv", date: "Fri, 27 Jan 2017 21:53:51 +0000"},
    {name: "banana", link: "https://wiki.com/what-ever/mmmmmmmmm/mdmdm", date: "Fri, 27 Jan 2017 16:36:51 +0000"},
    {name: "pe", link: "http://duckduckgo.com/what-ever/nnnnnnnnnnn", date: "Fri, 27 Jan 2017 11:47:52 +0000"},
];
  filteredItems:Array<any>;
  hostnamesMap:any;
  constructor(private sortByDateFilter:SortByDatePipe) {
    // try altering the arguments to fewer columns.
    this.createHostNameMap();
    this.filteredItems=[];
    for(var key in this.hostnamesMap){
      if(this.hostnamesMap[key] && this.hostnamesMap[key].length>0){
        //TODO do what you want with the filtered and grouped by items.
        this.filteredItems = this.filteredItems.concat((this.sortByDateFilter.transform(this.hostnamesMap[key],"date")));
        this.filteredItems.push({name:"--------"});
        console.log("this.filteredItems",this.filteredItems);
      }
    }
  }
  // group your array.
  createHostNameMap(){
    this.hostnamesMap={} // hostname as key, and an array of items as value
    this.items.map((item) => {
       var wordCount = item.link.split("/");
       var result = wordCount[0] + "//" + wordCount[2];
       if(!this.hostnamesMap[result]){ // create an entry of not existing
         this.hostnamesMap[result] = [item];
       }else{ // add item to already existing entry
         this.hostnamesMap[result].push(item);
       }
    }); 
  }
}


@NgModule({
  imports: [ BrowserModule ],
  declarations: [ App ],
  providers: [SortByDatePipe],
  bootstrap: [ App ]
})
export class AppModule {}