I'm curious as to why my array is only being filled within the subscription function

When I call the GetAllMainStore() function, data is successfully retrieved from the API and the console indicates that "this.MainStoreArray" contains data.

The problem arises when I attempt to access "this.MainStoreArray" outside of the GetAllMainStore() function - the array appears empty. I am struggling to understand why this is happening as the console.log in the ngOnInit function shows an empty result.

  ngOnInit() {

    this.CurrentStore = this.stateService.CurrentStore;
    this.CurrentMainStore = this.stateService.CurrentMainStore;

    this.stateService.CurrentStore = undefined;
    this.stateService.CurrentMainStore = undefined;

    this.GetAllMainStore();

    console.log(this.MainStoreArray);

    // this.EditStoreForm = this.formBuilder.group({
    //   storeId: [this.CurrentStore.storeId],
    //   storeName: [this.CurrentStore.storeName, Validators.required],
    //   storeLocation: [this.CurrentStore.storeLocation],
    //   storeRating: [this.CurrentStore.storeRating]
    // });

  }//ngOnInit

  GetAllMainStore() {

    this.dataService.GetAllMainStores().subscribe((data) => {

      this.MainStoreArray = data;

      console.log(this.MainStoreArray);

    });

  }// get Main Store

Answer №1

Understanding Asynchronous programming is crucial. Any functionality that relies on asynchronous data must be handled within the subscription. Attempting to access state outside of the subscription will result in errors. For additional insight, check out this resource

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