Transforms arrays with ordering by date

ArraySortPipe.js

/* Posted by @nmai
 * Original credits go to Vlado Tesanovic
 *
 * See his Stack Overflow answer + Plunkr example at
 * ->  http://stackoverflow.com/a/34528168/1146881
 *
 * Example usage, sorting by the "date" property:
 * <li *ngFor="#item of array | arraySort:'-date'">{{item.name}} {{item.date | date:'medium' }}</li>
 *
 * Change the direction by using + instead of - in the arraySort arguments
 */

import { Pipe, bind } 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
  }
}

export var arraySortPipeInjectables: Array<string> = [
  bind(ArraySortPipe).toValue(ArraySortPipe)
]