Filter/Sort Pipe for History Week 2017 App

filterSortPipeHW17.txt

import {Pipe, PipeTransform} from '@angular/core';
import {IEvent} from './event';
import * as moment from 'moment/moment';

export const EventFilter: (value: IEvent[], region: string, dayOfWeek: string, showFeaturedEvents: boolean) => IEvent[] = function (value: IEvent[], region: string, dayOfWeek: string, showFeaturedEvents: boolean) {
  return value.filter(event => {
    let today = moment();
    let eventDate = moment(event.date, 'YYYY-MM-DD');
    if (eventDate.isAfter(today)) {
      if (region !== null) {
        if (showFeaturedEvents === true) {
          return event.featuredEvent === 'TRUE'
        } else {
          return event.region === region;
        }
      } else {
        if(showFeaturedEvents === true){
          return event.featuredEvent === 'TRUE'
        } else {
          return true;
        }
      }
    }
  });
};

const EventSort: (value: IEvent[], eventSort: keyof IEvent, sortDirection: boolean) => IEvent[] =
  function (value: IEvent[], eventSort: keyof IEvent, sortDirection: boolean) {
    return value.sort((a, b) => {
      if (a[eventSort] < b[eventSort]) {
        return sortDirection ? -1 : 1;
      }
      if (a[eventSort] > b[eventSort]) {
        return sortDirection ? 1 : -1;
      }
      return 0;
    });
  };

@Pipe({
  name: 'EventsPipe'
})
export class EventsPipe implements PipeTransform {
  transform(value: any,
            regionSelected: string,
            dayOfWeekSelected: string,
            sortField: keyof IEvent,
            sortDirection: boolean,
            showFeaturedEvents: boolean): any {
    if (!value) {
      return value;
    }
    // console.log(regionSelected, dayOfWeekSelected, sortField, sortDirection, value);
    value = EventFilter(value, regionSelected, dayOfWeekSelected, showFeaturedEvents);
    value = EventSort(value, sortField, sortDirection);
    return value;
  }
}