add array of objects to array - typescript

Question

I have a class:

export class Party {
  constructor ( public title: string,
            public lan1: number,
            public lan2: number ) { }
}

I have a service:

import { Party } from '../classes/party';

export class PartyService {

 parties: Party[] = [];

  addData(title: string, lan1: number, lan2: number) {
    this.parties.push(new Party(title, lan1, lan2));
  }

  getData(): Party[] {
    return this.parties;
   }

}

I have a component:

export class AppComponent implements OnInit {
parties: Party[] = [];

title = 'app';

party_location: Location[] =  [
  { lat: 123, lng: 23 }
];

constructor(private partyService: PartyService){}

ngOnInit() {

  this.parties = this.partyService.getData();
 }

}

And I want to add parties properties to party_location like this:

for (let item in this.parties) { this.party_location.push(new Location(item.lan1, item.lan2)); }

But I can't because typescript doesn't see lan1 lan2 properties in item. How I can do this?

Titian Cernicova-Dragomir · Accepted Answer · 2017-09-11 16:16:22Z

3

You need to use for..of to iterate the array. for..in iterates the properties of an object, for..of iterates an array elements:

for (let item of this.parties) { 
   this.party_location.push(new Location(item.lan1, item.lan2)); 
}

answered Sep 11, 2017 at 16:16

Titian Cernicova-Dragomir

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1 Comment

Titian Cernicova-Dragomir Over a year ago

@yuracr9 glad to help, don't forget to upvote and park as answered :)

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