Why HttpParams doesn't work in multiple line in angular 4.3

Question

From Angular 4.3 they introduced HttpClient instead of Http. in HttpClient I can\'t use URLSearchParams for url query parameter . instead of

Answer 1

For this to work

var params = new HttpParams();
params.append('a', '1');
params.append('b', '2');

This has to be changed to

var params = new HttpParams();
params = params.append('a', '1');
params = params.append('b', '2');

It can be looped and added dynamically