Basics of Combine

comb7.swift

let subject = CurrentValueSubject<String, Never>("This text should not be sent")
subject.send("😉")

let subscriber1 = subject.sink { (value) in
    print("First subscriber received value: \(value)")
}

subject.send("🐶")

let subscriber2 = subject.sink { (value) in
    print("Second subscriber received value: \(value)")
}

subject.send("🐭”)
Output: 
    First subscriber received value: 😉
    First subscriber received value: 🐶
    Second subscriber received value: 🐶
    First subscriber received value: 🐭
    Second subscriber received value: 🐭