JuniorTheoryCommon

What does the program print (lines separated by spaces)?

Console.WriteLine(Label(10));
Console.WriteLine(Label(50));

string Label(int n) => n switch
{
    > 10 => "big",
    > 0 => "positive",
    _ => "other",
};

positive big

Expecting a compile error because 50 fits two arms: overlapping arms are legal, and only an arm that can never win fails to compile.
Expecting the last matching arm, or _, to win: the arms are tried from top to bottom, and the first match ends the choice.

What happens if you swap the arms > 10 and > 0?
Which arm does Label(-5) reach, and why?

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JuniorTheoryCommon

What does the program print (lines separated by spaces)?

Console.WriteLine(Label(10));
Console.WriteLine(Label(50));

string Label(int n) => n switch
{
    > 10 => "big",
    > 0 => "positive",
    _ => "other",
};

positive big

Expecting a compile error because 50 fits two arms: overlapping arms are legal, and only an arm that can never win fails to compile.
Expecting the last matching arm, or _, to win: the arms are tried from top to bottom, and the first match ends the choice.

What happens if you swap the arms > 10 and > 0?
Which arm does Label(-5) reach, and why?

Back to questions Open topic in roadmap →Answer it yourself — Quiz