How to show comment replies in descending order based on time

Ionic Framework ionic-v3
4

I’m using moment.js, you could just stick to the Date class.

import { Pipe, PipeTransform } from '@angular/core';

import moment from 'moment';

@Pipe({
  name: 'sortByDatetime',
})
export class SortByDatetime implements PipeTransform {

  transform(value: any, keyName?: string): Object[] {

    value.sort((a: Object, b: Object): number => {
      var first = moment(a[keyName], 'YYYY-MM-DD HH:mm:ss');
      var second = moment(b[keyName], 'YYYY-MM-DD HH:mm:ss');
      // console.log('SortBy: Compare ' + first.format('YYYY-MM-DD HH:mm:ss') + ' to ' + second.format('YYYY-MM-DD HH:mm:ss'));
      return first.isBefore(second) ? -1 : first.isAfter(second) ? 1 : 0;
    });
    return value;
  }
}

Call it using

<ion-item *ngFor='let reply of comment.replies.comments | sortByDatetime:"publishedAt"'>