Sort Contacts from Adress Book Alphabetical

HI,

I have a function, that reads the phonebook. After getting the contacts, it should sort them.
The last time, I worked on my APP, it worked, now, it doesn’t.

This is my code:

import { Component } from '@angular/core';
import { IonicPage, NavController, NavParams } from 'ionic-angular';
import { Contacts } from '@ionic-native/contacts';

@IonicPage()
@Component({
  selector: 'page-telefonbuch',
  templateUrl: 'telefonbuch.html',
})

export class TelefonbuchPage {
  
  entries : any
  contacts1 = []

  constructor(public navCtrl: NavController, public navParams: NavParams, private contacts: Contacts) {
    this.contacts.find(["displayName", "phoneNumbers"], {multiple: true, hasPhoneNumber: true}).then((contacts) => {
      for (var i=0 ; i < contacts.length; i++){
        if(contacts[i].displayName !== null){
          var obj = {};
          obj["name"]   = contacts[i].displayName;
          obj["number"] = contacts[i].phoneNumbers[0].value;
          this.contacts1.push(obj)    // adding in separate array with keys: name, number
        }       
       }
    });
    this.entries    = this.contacts1;
  }

  compare(a,b) {
    if (a.name < b.name)
      return -1;
    if (a.name > b.name)
      return 1;
    return 0;
  }
 
  ionViewDidLoad() {
    this.entries.sort(this.compare);
  }

}

Currently it does not return sorted contacts.
What is wrong with my code?

Many Thanks,
Lars