Merge Publisher

Merge.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, 10].publisher

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

// Use the `Merge` operator to combine the emissions of the even and odd integer publishers
// into a single stream of values.
// This means that as each publisher emits a value, the merged stream will emit that value,
// effectively interweaving the two sequences of numbers.
Publishers.Merge(
    evenIntegersPublisher,
    oddIntegersPublisher
)
.sink { value in
    // For every value emitted from the merged stream (be it even or odd), print it out.
    print(value)
}
// Store the subscription in the `cancellables` set.
// This ensures that the subscription remains active and won't be prematurely deallocated.
.store(in: &cancellables)

//2
//4
//6
//8
//10
//1
//3
//5
//7
//9