I admit it, I’ve struggled with pattern matching. In the next few blog posts I’ll explore this magic, starting today with switch expressions (not to be confused with switch statements).
The type of switch we’re familiar with is the switch statement:
namespace switchStatement;
internal class Program
{
static void Main(string[] args)
{
string day = string.Empty;
day = GetDay(2);
Console.WriteLine(day);
}
public static string GetDay(int dayNum)
{
string dayName;
switch (dayNum)
{
case 0:
dayName = "Sunday";
break;
case 1:
dayName = "Monday";
break;
case 2:
dayName = "Tuesday";
break;
case 3:
dayName = "Wednesday";
break;
case 4:
dayName = "Thursday";
break;
case 5:
dayName = "Friday";
break;
case 6:
dayName = "Saturday";
break;
default:
dayName = "Invalid day number";
break;
}
return dayName;
}
}This will return Tuesday.
A switch expression has a slightly different syntax, but more important, it matches on a pattern. I’m going to use the example from Microsoft Learning (https://learn.microsoft.com/en-us/dotnet/csharp/language-reference/operators/switch-expression) and take it apart
public static class SwitchExample
{
public enum Direction
{
Up,
Down,
Right,
Left
}
public enum Orientation
{
North,
South,
East,
West
}
public static Orientation ToOrientation(Direction direction) => direction switch
{
Direction.Up => Orientation.North,
Direction.Right => Orientation.East,
Direction.Down => Orientation.South,
Direction.Left => Orientation.West,
_ => throw new ArgumentOutOfRangeException(nameof(direction), $"Not expected direction value: {direction}"),
};
public static void Main()
{
var direction = Direction.Right;
Console.WriteLine($"Map view direction is {direction}");
Console.WriteLine($"Cardinal orientation is {ToOrientation(direction)}");
}
}The output of this is
Map view direction is Right
Cardinal orientation is EastThe method ToOrientation takes a Direction and calls the switch expression (notice the placement of the keyword switch).
It then sets up the Direction to Orientation pattern matching. For example, it establishes that if the passed in parameter is Direction.Up (that is, the Up enumerated constant) then it is to be converted to Orientation.North, and so forth. (The underscore is a new way of indicating no value, or in this case, the default).
The various expressions are called “arms” and are separated by commas. Each arm contains a pattern and an expression. In the first arm, Direction.Up returns the expression Orientation.North.
It is this pattern matching that I’ll be exploring in the next few blog posts.
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I’ve definitely gone through that same mental shift while adjusting to pattern matching, as it feels so different from the classic procedural style. Do you find that the conciseness of switch expressions ever creates readability issues when the logic patterns become particularly complex?
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Great breakdown, Jesse. I initially leaned on standard switch statements out of habit, but once you get comfortable with the expression syntax, it’s amazing how much cleaner and more readable the code becomes. Looking forward to the rest of the series on pattern matching!
The shift from imperative switch statements to expressions is a total game-changer for code readability. I’m curious if you find that this style changes how you approach error handling in your projects, especially when it comes to covering all potential cases?
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Thanks for breaking down switch expressions—they really do feel more intuitive once you get used to the pattern-matching syntax. I especially appreciated how you highlighted the difference between switch statements and expressions, since that distinction can trip up a lot of developers. It’s also great to see the example with the Direction enum, as it makes the concept much clearer in practice.
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Thanks for breaking down switch expressions—they really do feel more intuitive once you get used to the pattern-matching syntax. I especially appreciated how you highlighted the difference between switch statements and expressions, since that distinction can trip up a lot of developers. It’s a small change in approach but makes code much cleaner, especially when dealing with complex conditions.
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