Make a second http call and use the result in same Observable

Question

I am using angular 2 and it\'s http component.

I want to call a REST API that will return a list of Elements. The size of that list is limited to 100 entries. If the

Answer 1

Recursion is exactly what the expand operator is for:

let callAndMap = (pageNo) => call({page: pageNo}).map(res => {page: pageNo, data: res.json()});  // map, and save the page number for recursion later.

callAndMap(1)
.expand(obj => (obj.data.meta.hasMore ? callAndMap(obj.page + 1) : Observable.empty()))
//.map(obj => obj.data)    // uncomment this line if you need to map back to original response json
.subscribe(callback);