Pattern matching

Pattern matching is used for:

• testing expression to check if some value have certain characteristics
• safer compare because '==' and '!=' can be overloaded

Examples:

a is int numbersequence is IList<T> list

switch statement:

command switch { Operation.SystemTest => RunDiagnostics(), Operation.Start => StartSystem(), Operation.Stop => StopSystem(), Operation.Reset => ResetToReady(), _ => throw new ArgumentException("Invalid enum value for command", nameof(command)), };

switch with ranges:

tempInFahrenheit switch { (> 32) and (< 212) => "liquid", < 32 => "solid", > 212 => "gas", 32 => "solid/liquid transition", 212 => "liquid / gas transition", };

collection pattern matching:

array is [1,1,2,3,5,8, ..]

Further read:

https://learn.microsoft.com/en-us/dotnet/csharp/fundamentals/functional/pattern-matching