if statement inside of ForEach in iOS SwiftUI

I have an "if" inside of a ForEach in iOS SwiftUI (Xcode version 11.6) and it works correctly.

struct ContentView: View {
    var body: some View {
        List {
            ForEach(0 ..< 10) {(i: Int) in
                if i % 2 == 0 {
                    Text(String(i))
                }
            }
        }
    }
}

Now I would like to do the same thing, but with an array of Strings instead of a half-open range of Ints.

struct ContentView: View {
    let states: [String] = [
        "Alabama",
        "Alaska",
        "Arizona",
        "Arkansas",
        "California"
    ];
    
    var body: some View {
        List {
            ForEach(states, id: \.self) {(state: String) in
                if state.hasPrefix("Al") {
                    Text(state)
                }
            }
        }
    }
}

The error message I get from this ForEach is

Type '()' cannot conform to 'View'; only struct/enum/class types can conform to protocols

What has gone wrong? I'm puzzled because Apple's SwiftUI tutorial has an "if" inside of a ForEach in Section 3, Step 1 of https://developer.apple.com/tutorials/swiftui/handling-user-input
Thank you in advance.