Compare RxJS subjects.
01
01
Understand the problem
rxjssubject
02
02
Attempt it yourself
Sketch your approach before reading the solution — that's what interviews test.
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03
03
Study the solution
The solution is waiting
Give it an honest attempt first — then compare your thinking with the full walkthrough.
04
04
Read the code
Late subscriber behaviour
import { Subject, BehaviorSubject, ReplaySubject } from 'rxjs';
const s = new Subject<number>();
const b = new BehaviorSubject<number>(0); // initial value
const r = new ReplaySubject<number>(2); // buffer last 2
s.next(1); b.next(1); r.next(1); r.next(2);
s.subscribe(v => console.log('subject:', v)); // (nothing — missed 1)
b.subscribe(v => console.log('behavior:', v)); // 1 (current value)
r.subscribe(v => console.log('replay:', v)); // 1, 2 (last two)05
05
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