typescript - RxJS: map function not reached -

i've implemented dunction:

public deletecards(user: string, tokens: array<string>, extrahttprequestparams?: any): observable<{}> {     return this.deletecardswithhttpinfo(user, tokens, extrahttprequestparams)         .map((response: response) => {             if (response.status === 204) {                 return undefined;             } else {                 return response.json();             }         }).catch((error: any) => {             if (error.status >= 500) {                 return observable.throw(new error(error.status));             }             else { //if (error.status >= 400) {                 const body = error.json() || '';                 const code = body.error || json.stringify(body);                 const message = body.message || json.stringify(body);                 return observable.throw(apierror.create(code, message));             }         }); } 

as can see, returns observable<{}>. i'm calling as:

this.deletecards(action.payload.username, action.payload.tokens)       .map(() => {   ((((1))))         return <action>{           type: 'delete_cards_success',           payload: action.payload.tokens         };       })       .catch(_ => {         return observable.of(<action>{ type: 'delete_cards_failed', payload: { }});       })); 

nevertheless, ((((1)))) never reached.

i've tried this:

1. .map(_ => { ...
2. .map((p:any) => {...

but it's never reached.

you have subscribe observable anything:

this.deletecards(...).map(...).catch(...).subscribe((action: action) => {     // action. });