Zip Publishers

Zip.swift

import Combine

// A set to store any active Combine subscriptions (cancellables).
// This is essential for ensuring that the subscriptions are kept alive and not deallocated prematurely.
var cancellables = Set<AnyCancellable>()

// Create a publisher from an array of even integers.
let evenIntegersPublisher = [2, 4, 6, 8].publisher

// Create a publisher from an array of odd integers.
let oddIntegersPublisher = [1, 3, 5, 7, 9].publisher

// Use the `Zip` operator to combine values from the even and odd integer publishers
// based on their positions in their respective sequences.
// For example, the first item from `evenIntegersPublisher` will be combined with the first
// item from `oddIntegersPublisher`, the second with the second, and so on.
Publishers.Zip(
    evenIntegersPublisher,
    oddIntegersPublisher
)
.sink { even, odd in
    // For every paired even and odd integers, print them out.
    print("Latest even is ", even, " and latest odd is ", odd)
}
// Store the subscription in the `cancellables` set.
// This ensures that the subscription remains active and won't be prematurely deallocated.
.store(in: &cancellables)

//Latest even is  2  and latest odd is  1
//Latest even is  4  and latest odd is  3
//Latest even is  6  and latest odd is  5
//Latest even is  8  and latest odd is  7