rest - How to return the result received from http request inside http request in ionic 2 framework using angular 2.My code is following - 


getusabletoken() {      let platformname = "abc";     let platformid = "123123";      return this.http.get('http://localhost:17001/platform/' + platformid + '/key?name=' + platformname).map(res => res.json())         .subscribe(data => {                  let secretkey = data.payload.platforminfo.key;                  return this.http.get('http://localhost:17001/platform/' + platformid + '/token?name=' + platformname + '&key=' + secretkey).map(res => res.json())                     .subscribe(data => {                         return data.payload.token;                      }, err => {                         console.log(err);                     });             },             err => {                 console.log(err);             }); }

in code want return data.payload.token. how that? appreciated.

what make use of flatmap (mergemap) here, since second call dependent on result of first call, this:

import 'rxjs/add/operator/mergemap';  //....  getusabletoken() {   return this.http.get('url')     .map(data => {       let secretkey = data.json().payload.platforminfo.key       return secretkey;     })     // 'key' parameter need second call     .flatmap(key => this.http.get('url').map(data => {         let token = data.json().payload.token;         return token;     }))  }

and subscribe token:

dosomething() {   this.myservice.getusabletoken()      .subscribe(token => console.log(token)) }

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