Observing an array test

test.swift

import Combine

var list = ["A", "B", "C"]
let cancellable = list.publisher
    .collect()
    .sink { completion in
        print("Completed with \(completion)")
    } receiveValue: { value in
        print(value)
    }

print("@@ start mutating list @@")
list.append("D")
list.removeAll { $0 == "B"}
print(cancellable)

// output looks like the following.
// ---
// ["A", "B", "C"]
// Completed with finished
// @@ start mutating list @@
// Combine.AnyCancellable
// ---