BindingExample.swift

import PlaygroundSupport
import SwiftUI

struct ContentView: View {

    @State private var userQuestions: [String] = [
        "one", "two"
    ]

    var body: some View {
        NavigationView {
            List {
                ForEach(self.userQuestions, id: \.self) { question in
                    NavigationLink(destination: DetailView(userQuestions: self.$userQuestions, question: question)) {
                        Text(question)
                    }
                }
            }
        }
    }
}

struct DetailView: View {

    @Environment(\.presentationMode) var presentationMode
    @Binding var userQuestions: [String]

    let question: String

    var body: some View {
        HStack {
            Text(self.question)
            Button(action: {
                self.userQuestions.removeAll { $0 == self.question }
                self.presentationMode.wrappedValue.dismiss()
            }, label: {
                Text("Answer")
            })
        }
    }
}

PlaygroundSupport.PlaygroundPage.current.liveView = UIHostingController(rootView: ContentView())