Operators

List of common RxSwift Operators

Event sequence:

A: a --- b ---- c
B:   x ---- y

• combineLatest(A,B) → emit (latestA, latestB) whenever A or B emits (after both have at least one).

  Example timeline (letters are emissions; time flows →):

combineLatest(A,B):
     (a,x) (b,x) (b,y) (c,y)

• zip(A,B) → pair 1st with 1st, 2nd with 2nd, etc.; waits for the counterpart:

zip(A,B): (a,x) (b,y)     // c waits for a 3rd value from B

• merge(A,B) → interleave events as they come; no pairing:
  • just funnels events from multiple sources into one stream; use it when you want either source to trigger independently.

merge(A,B): a b x y c

• map

// these are all equivalent:
.map { q, _ in q }                          // destructure params
.map { tuple in let (q, _) = tuple; return q } // explicit tuple
.map { $0.0 }                               // take first element