Simple Array Sort pipe

<!DOCTYPE html>
<html>

  <head>
    <title>angular2 playground</title>
    <link rel="stylesheet" href="style.css" />
    <script src="https://code.angularjs.org/2.0.0-beta.0/angular2-polyfills.js"></script>
    <script src="https://code.angularjs.org/tools/system.js"></script>
    <script src="https://code.angularjs.org/tools/typescript.js"></script>
    <script src="config.js"></script>
    <script src="https://code.angularjs.org/2.0.0-beta.0/Rx.js"></script>
    <script src="https://code.angularjs.org/2.0.0-beta.0/angular2.js"></script>
    <script src="https://code.angularjs.org/2.0.0-beta.0/http.js"></script>
    <script>
    System.import('app')
      .catch(console.error.bind(console));
  </script>
  </head>

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

</html>

/* Styles go here */

### Angular2 Starter Plunker - Typescript - Beta 0

A simple plunker demonstrating Angular2 usage:
- Uses SystemJS + TypeScript to compile on the fly
- Includes binding, directives, http, pipes, and DI usage.

System.config({
  //use typescript for compilation
  transpiler: 'typescript',
  //typescript compiler options
  typescriptOptions: {
    emitDecoratorMetadata: true
  },
  //map tells the System loader where to look for things
  map: {
    app: "./src"
  },
  //packages defines our app package
  packages: {
    app: {
      main: './main.ts',
      defaultExtension: 'ts'
    }
  }
});

//main entry point
import {bootstrap} from 'angular2/platform/browser';
import {App} from './app';

bootstrap(App, [])
  .catch(err => console.error(err));

import { Component } from 'angular2/core';
import { DatePipe } from "angular2/common";
import { ArraySortPipe } from "./pipe";

@Component({
  selector: 'my-app',
  providers: [],
  pipes: [DatePipe, ArraySortPipe],
  template: `
    <ul>
      <li *ngFor="#item of array | arraySort:'-date'">{{item.name}} {{item.date | date:'medium' }}</li>
    </ul>
  `,
  directives: []
})
export class App {
  
  array: Array<any> = [{
    name: "John",
    date: new Date('2005-12-17T03:24:00')
  },
  {
    name: "Smith",
    date: new Date('2008-12-17T03:24:00')
  },
  {
    name: "Suzan",
    date: new Date('2009-12-17T03:24:00')
  }]
  
  constructor() {}
}

import { Pipe } from "angular2/core";

@Pipe({
    name: "arraySort"
})
export class ArraySortPipe {

    transform(array: Array<string>, args: string): Array<string> {
        if (typeof args[0] === "undefined") {
            return array;
        }

        let direction   = args[0][0];
        let column      = args[0].slice(1);

        array.sort((a: any, b: any) => {

            let left    = Number(new Date(a[column]));
            let right   = Number(new Date(b[column]));

            return (direction === "-") ? right - left : left - right;
        });

        return array;
    }
}