ionic framework - Angular Promise : unable to get value -

i'm coming python world, , beginner in angular / ts / js way of programming.

the ionic storage.get() method returns promise. how should value of token in order send http query ?

for now, i'm trying faulty bloc :

get(url: string): observable<response> {   let token = "";   this.storage.get('token')       .then(token => token = token);    return this.http.get(url, { "authorization" : token}); } 

of course, request leaves token = "" instead of 1 should have come after promise resolution.

i can see not other method in promise then() , catch(). have considered following code :

get(url: string): observable<response> {   return this.storage.get('token').then(     token => {       return this.http.get(url, { "authorization": token } )   ); }); 

but then, get(url) returns promise<observable<response>> instead of observable<response> , not me much.

if anwser lies within use of defer ($q https://docs.angularjs.org/api/ng/service/$q) , please tell me how class can imported angular / ionic ?

thank assistance :)

no, $q used in angularjs deal promises. here in angular using observable mostly.

you use observable.frompromise convert promise observable followed flatmap, return observable of response type.

import { observable } 'rxjs/observable'; import 'rxjs/add/observable/frompromise';  get(url: string): observable<response> {   let token = "";   return observable.frompromise(this.storage.get('token'))       .flatmap(token => this.http.get(url, { "authorization" : token})); }