Calling Observable by subscribe .Return data in a subscribe call.

 Calling Observable method using  subscribe  and return data in a subscribe 'd call.

Calling method:

onClick(fileName){
this._service.getFiles(fileName).subscribe(filestring => {
console.log('filestring',filestring.fileContent);
}, (err)=> {
console.log('Error to get file',err);
});
}

Called method: 

getFiles(fileName): Observable<any> {

return this._http

.get(this.baseUrl + '/' + fileName, this.options())

.map((res: Response) => res.json()

)

}