csharp8.cake

// Switch expression
static string ToLevel(this Verbosity verbosity)
    => verbosity switch
    {
        Verbosity.Diagnostic    => "[****]",
        Verbosity.Verbose       => "[*** ]",
        Verbosity.Normal        => "[**  ]",
        Verbosity.Minimal       => "[*   ]",
        Verbosity.Quiet         => "[    ]",
         _  => throw new ArgumentOutOfRangeException(message: "invalid enum value",
            actualValue: verbosity,
            paramName: nameof(verbosity)),
    };

Verbosity[] verbosities = null;

// Null-coalescing assignment
verbosities ??= (Verbosity[])Enum.GetValues(typeof(Verbosity));

// Range last 4
foreach(Verbosity verbosity in verbosities[^4..])
{
    Information(
        "{0} = {1:F}",
        verbosity.ToLevel(),
        verbosity
        );
}