[angular] How to convert Observable<any> to array[]

I have following method in typescript, I need to bind to angular grid

CountryService

GetCountries()  {
  return this.http.get(`http://services.groupkt.com/country/get/all`)
    .map((res:Response) => <CountryData[]>res.json().RestResponse["result"]);
}

GridComponent

  template: `
        <ag-grid-ng2 style="width: 100%" #agGrid class="ag-material"
                    rowHeight="50"
                    [gridOptions]="myGridOptions" 
                     >
            </ag-grid-ng2>
        `,

  this.myGridOptions.rowData= this.CountryService.GetCountries();

CountryData

export class CountryData{
  name: string;
  alpha2_code: string;
  alpha3_code: string;
}

But GetCoutries will return Observable of any, unable to bind to rowData?

How to convert Observable to CountryData[] in typescript ?

you find JSON data here: http://services.groupkt.com/country/get/all

Using HttpClient (Http's replacement) in Angular 4.3+, the entire mapping/casting process is made simpler/eliminated.

Using your CountryData class, you would define a service method like this:

getCountries()  {
  return this.httpClient.get<CountryData[]>('http://theUrl.com/all');
}

Then when you need it, define an array like this:

countries:CountryData[] = [];

and subscribe to it like this:

this.countryService.getCountries().subscribe(countries => this.countries = countries);

A complete setup answer is posted here also.

This should work:

GetCountries():Observable<CountryData[]>  {
  return this.http.get(`http://services.groupkt.com/country/get/all`)
    .map((res:Response) => <CountryData[]>res.json());
}

For this to work you will need to import the following:

import 'rxjs/add/operator/map'

//Component. home.ts :

  contacts:IContacts[];


ionViewDidLoad() {
this.rest.getContacts()
.subscribe( res=> this.contacts= res as IContacts[]) ;

// reorderArray. accepts only Arrays

    Reorder(indexes){
  reorderArray(this.contacts, indexes)
}

// Service . res.ts

getContacts(): Observable<IContacts[]> {
return this.http.get<IContacts[]>(this.apiUrl+"?results=5")

And it works fine