ContentView.swift

let colors: [String] = [
    "Blue",
    "Green",
    "Orange",
    "Purple",
    "Red",
    "Yellow"
]

func randomBackgroundColor() -> Color? {
    if let color = colors.randomElement() {
        return Color(color)
    }
    return nil
}

func randomBackgroundColor() -> Color? {
    // the .randomElement method on any array
    // returns an optional 
    // so in this case it would be String? 
    // because the compiler knows, and you declared
    // that this array contains strings
    // So you need to unwrap it before...
    if let color = colors.randomElement() {
        // ...you use it here
        // as Color(named:) also returns an optional (Color?)
        // but doesn't take an optional as a parameter
        // it's defined as Color(named: string) not Color(named: string?) 
        // so you need to make sure you have an actual value to use it
    }

    // Since there's no way to guarantee at a compiler level that the array
    // will have a randomElement, we need to return nil since it's possible
    // the other code won't be touched
}