The entry point to the Myra pattern matching machanism is the Match() extension method, that can be invoked from any type of object.

This method takes two parameters:

• A Pattern<T>, that specifies the condition the matching object must verify.
• An Action<T>, that will be executed if the condition is satisfied.

To create a pattern, use the Pattern.From() method, that takes a Func<T, bool> as a parameter:

var isEven = Pattern<int>.From(n => n % 2 is 0);

var isHusky = Pattern<Dog>.From(d => d is Husky);

A normal call to Match can look like this:

number.Match(isEven, n => Console.WriteLine($"{n} is even."));

// You can also inline the pattern
number.Match(Pattern<int>.From(n => n % 2 is 0), n => Console.WriteLine($"{n} is even."));
            

To try a different pattern with an object, append another call to Match after the first one:

fluffy.Match(Pattern<Dog>.From(d => d is Husky), d => Console.WriteLine($"{d.Name} is truly fluffly."))
    .Match(Pattern<Dog>.From(d => d.Heads.Count > 1), d => Console.WriteLine($"{d.Name} is guarding the philosopher's stone."));
            

All the patterns will be checked, and any matching patterns will be executed. If you need a more advanced condition system, check the Advanced Logic guide.