I'm new to programming and SwiftUI and I am making this app where users can select these buttons labeled A-D. They may choose more than 1, and I am hoping that when they click on the button, the background colour will change from grey to green. However, if I replace "// Here" in the code at the bottom with

```
Data.Selected = true
Data.Colour = .green

```

I get an error saying "Cannot assign to property: 'Data' is a 'let' constant". I understand what that means, but I don't know how to change Data to var. I tried typing var in front of "Data in" but I got this error instead "Consecutive statements on a line must be separated by ';'". Is there anyway I can directly modify Data/ButtonsData? Or is there a workaround?

```
struct Buttons: Hashable {
    var Crit: String
    var Selected: Bool
    var Colour: Color
}

var ButtonsData = [
    Buttons(Crit: "A", Selected: false, Colour: Color(.systemGray4)),
    Buttons(Crit: "B", Selected: false, Colour: Color(.systemGray4)),
    Buttons(Crit: "C", Selected: false, Colour: Color(.systemGray4)),
    Buttons(Crit: "D", Selected: false, Colour: Color(.systemGray4))
]

struct CritView: View {

    @Binding var CritBoard: Bool
    @Binding var BackgroundColor: Color

    var body: some View {
        ZStack(alignment: .topLeading) {

            ScrollView(.vertical, showsIndicators: false) {
                HStack(spacing: 15) {
                    ForEach(ButtonsData, id: \.self) { Data in
                        Button(action: {
                          // HERE
                        }) {
                            Text(Data.Crit)
                                .font(.system(size: 30))
                        }
                        .frame(width: 65, height: 55)
                        .background(Data.Colour)
                        .cornerRadius(10)
                    }
                }
                .padding(.top, 50)
            }
            .frame(width: UIScreen.main.bounds.width, height: UIScreen.main.bounds.height/8)
            .padding(.bottom, UIApplication.shared.windows.first?.safeAreaInsets.bottom)
            .background(Color(.white))
            .cornerRadius(25)

            Button(action: {
                self.CritBoard.toggle()
                self.BackgroundColor = .white
            }) {
                Image(systemName: "xmark").foregroundColor(.black)
            }.padding(25)
        }
    }
}

```