✅ Switch pattern matching with integers

Is this a valid/idiomatic way to use pattern matching to compare integers?

    public static double SuccessRate(int speed) =>
        speed switch
        {
            0 => 0.0,
            < 5 => 1.0,
            < 9 => 0.9,
            9 => 0.8,
            10 => 0.77,
            _ => throw new Exception($"Expected speed between 0 and 10, got `{speed}`")
        };

    public static double SuccessRate(int speed) =>
        speed switch
        {
            0 => 0.0,
            < 5 => 1.0,
            < 9 => 0.9,
            9 => 0.8,
            10 => 0.77,
            _ => throw new Exception($"Expected speed between 0 and 10, got `{speed}`")
        };

One thing bugging me in particular is: are the arms checked in the order they were written, or is the order not guaranteed?

If the order is not guaranteed, then obviously the code above does not work.

C#•3y ago•

44 replies

__dil__

✅ Switch pattern matching with integers

Is this a valid/idiomatic way to use pattern matching to compare integers?

    public static double SuccessRate(int speed) =>
        speed switch
        {
            0 => 0.0,
            < 5 => 1.0,
            < 9 => 0.9,
            9 => 0.8,
            10 => 0.77,
            _ => throw new Exception($"Expected speed between 0 and 10, got `{speed}`")
        };

    public static double SuccessRate(int speed) =>
        speed switch
        {
            0 => 0.0,
            < 5 => 1.0,
            < 9 => 0.9,
            9 => 0.8,
            10 => 0.77,
            _ => throw new Exception($"Expected speed between 0 and 10, got `{speed}`")
        };

✅ Switch pattern matching with integers

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