Exporting Arrays in Ionic Angular with Typescript is an essential feature

When trying to access an exported component in Typescript, there may be issues with importing the module correctly into another component.

An error message is displayed when calling the AddToArray method:

Cannot read property 'push' of undefined

PageOne.ts

var const array = new Array(5);
export array;
class PageOne {
  constructor(public navCtrl: NavController, public navParams: NavParams) {
  }   
  GoToPage(){
    this.navCtrl.push('PageTwo');
  } 
}

PageTwo.ts

import { players } from '../pageone/pageone.ts'

export class PlayersPage {
  constructor(public navCtrl: NavController, public navParams: NavParams) { }
  AddToArray(){
     array.push("TEST") 
  }
}

Answer №1

It's interesting to see the use of arrays and exporting them, but I question the necessity.

I believe utilizing a service would be more efficient, as each component can easily access and modify data through the service.

For more information on why services are recommended in this scenario, check out this helpful document: https://angular.io/tutorial/toh-pt4#why-services

Answer №2

The reason for the error is that you need to declare and set up the array before utilizing it in your code.

    class PageOne {
      let items: number[] =[];

      constructor(public navCtrl: NavController, public navParams: NavParams) {
      }

      NavigateToNextPage(){
        this.navCtrl.push('PageTwo');
      }

    }

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