RxSwift: CombineLatest Operator
.combineLatest()
- Combine the latest values from each supplied Observable using a supplied function.
- Both Observables need to emit an element for combining to happen.
- Operator receives a closure predicate that is applied to each emitted element.
- The latest elements from each Observable are combined.
- You can combine sequences of heterogenous types - Only core operator that allows this.
- Can use
startWith(n)to kick things off. - Only completes when the last of its inner sequences completes.
- Multiple variants taking between 2 and 8 Observable sequences as parameters - One that takes an array.
---1---------2------3-------4----------5-------->
------a-b-------c-------d------e----f-------g--->
combineLatest((x, y) => "" + x + y)
------1a-1b--2b-2c--3c--3d--4d-4e---4f-5f---5g-->
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