RxJS sequence equivalent to promise.then()?

Question

I used to develop a lot with promise and now I am moving to RxJS. The doc of RxJS doesn\'t provide a very clear example on how to move from promise chain to observer sequenc

Answer 1

RxJS sequence equivalent to promise.then()?

For example

function getdata1 (argument) {
        return this.http.get(url)
            .map((res: Response) => res.json());
    }

    function getdata2 (argument) {
        return this.http.get(url)
            .map((res: Response) => res.json());
    }

    getdata1.subscribe((data1: any) => {
        console.log("got data one. get data 2 now");
        getdata2.subscribe((data2: any) => {
            console.log("got data one and two here");
        });
    });