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I have an Angular component, that subscribes to an observable, returned by an Angular Service.

Component: help.component.ts

import { WikiService } from '../../../services/wiki.service';

import { WikiTree } from '../../../interfaces/WikiTree';

export class HelpComponent implements OnInit {

    wikiTree$: Observable<WikiTree>

    public infoCards: Array<Object>;

    constructor(private wikiService: WikiService) {}

    ngOnInit() {
            this.wikiTree$ = this.wikiService.GetWikiHierarchy();
            this.wikiTree$.subscribe(()=>{
               //TODO: Create infoCards array by iterating through the results array inside the wikiTree observable.
            }
        }
}

The wikiTree$ Observable has the following JSON, converted to TypeScript:

{
    "page": {
        "results": [
            {
                "id": "123456789",
                "type": "page",
                "status": "current",
                "title": "Start here",
                "extensions": {
                    "position": 0
                },
                "_links": {
                    "webui": "/display/MYSPACE/Start+here",
                    "edit": "/pages/resumedraft.action?draftId=123456789",
                    "tinyui": "/x/BQD2Mw",
                    "self": "https://wiki.abc.com/rest/api/content/123456789"
                },
                "_expandable": {
                    "container": "/rest/api/space/MYSPACE",
                    "metadata": "",
                    "operations": "",
                    "children": "/rest/api/content/123456789/child",
                    "restrictions": "/rest/api/content/123456789/restriction/byOperation",
                    "history": "/rest/api/content/123456789/history",
                    "ancestors": "",
                    "body": "",
                    "version": "",
                    "descendants": "/rest/api/content/123456789/descendant",
                    "space": "/rest/api/space/MYSPACE"
                }
            },
            {
                "id": "567890123",
                "type": "page",
                "status": "current",
                "title": "FAQ",
                "extensions": {
                    "position": 1
                },
                "_links": {
                    "webui": "/display/MYSPACE/FAQ",
                    "edit": "/pages/resumedraft.action?draftId=567890123",
                    "tinyui": "/x/HQD2Mw",
                    "self": "https://wiki.abc.com/rest/api/content/567890123"
                },
                "_expandable": {
                    "container": "/rest/api/space/MYSPACE",
                    "metadata": "",
                    "operations": "",
                    "children": "/rest/api/content/567890123/child",
                    "restrictions": "/rest/api/content/567890123/restriction/byOperation",
                    "history": "/rest/api/content/567890123/history",
                    "ancestors": "",
                    "body": "",
                    "version": "",
                    "descendants": "/rest/api/content/567890123/descendant",
                    "space": "/rest/api/space/MYSPACE"
                }
            }
        ],
        "start": 0,
        "limit": 25,
        "size": 2,
        "_links": {
            "self": "https://wiki.abc.com/rest/api/content/998877665/child/page"
        }
    },
    "_links": {
        "base": "https://wiki.abc.com",
        "context": "",
        "self": "https://wiki.abc.com/rest/api/content/998877665/child"
    },
    "_expandable": {
        "attachment": "/rest/api/content/998877665/child/attachment",
        "comment": "/rest/api/content/998877665/child/comment"
    }
}

TypeScript: WikiTree.ts

export interface WikiTree {
    page: Page;
    _links: Links;
    _expandable: Expandable;
  }
  export interface Page {
    results?: (ResultsEntity)[] | null;
    start: number;
    limit: number;
    size: number;
    _links: Links1;
  }
  export interface ResultsEntity {
    id: string;
    type: string;
    status: string;
    title: string;
    extensions: Extensions;
    _links: Links2;
    _expandable: Expandable1;
  }
  export interface Extensions {
    position: number;
  }
  export interface Links2 {
    webui: string;
    edit: string;
    tinyui: string;
    self: string;
  }
  export interface Expandable1 {
    container: string;
    metadata: string;
    operations: string;
    children: string;
    restrictions: string;
    history: string;
    ancestors: string;
    body: string;
    version: string;
    descendants: string;
    space: string;
  }
  export interface Links1 {
    self: string;
  }
  export interface Links {
    base: string;
    context: string;
    self: string;
  }
  export interface Expandable {
    attachment: string;
    comment: string;
  }

I would like to iterate through "page" -> "results" array in the wikiTree$ observable in the subscribe method and create an array of objects called infoCards, as defined in the component with this JSON, with some of the values coming from wikiTree$ observable. :

[{
        "title": "Start here",
        "titleLink": "/page/wiki/123456789",
        "children": []
    },
    {
        "title": "FAQ",
        "titleLink": "/page/wiki/567890123",
        "children": []
    }
    ]

How do I do that?

Update:

InfoCard Component

import { Component, OnInit, Input } from '@angular/core';

@Component({
  selector: 'app-info-card',
  templateUrl: './info-card.component.html',
  styleUrls: ['./info-card.component.css']
})
export class InfoCardComponent implements OnInit {
  @Input('infoCard') infoCard: Array<Object>;

  constructor() { }

  ngOnInit() {
  }

}

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