How to use Scala matching pattern to check the contents of an object
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Let's try a deep match to check the contents of the object in our pattern matching.
/ / code-examples/Rounding/match-deep-script.scala
Case class Person (name: String, age:Int)
Val alice = new Person ("Alice", 25)
Val bob = new Person ("Bob", 32)
Val charlie = newPerson ("Charlie", 32)
For (person println ("HiAlice!")
Case Person ("Bob", 32) = > println ("Hi Bob!")
Case Person (name, age) = > println ("Who are you," + age + "year-old person named" + name + "?")
}
}
As we can see from the output of the above example, poor Charlie is ignored:
?
one
two
3 HiAlice!
Hi Bob!
Who are you, 32 year-old person namedCharlie?
We define a case class, a special type of class, and now we just need to know that a case class allows the construction of refined simple objects, as well as some predefined methods. Then, our pattern matching looks for Alice and Bob by checking the value of the Person case class passed in. Charlie was not captured until the last hungry case; although he was the same age as Bob, we also checked the name attribute.
As we will see later, this type of pattern matching can be very useful when working with Actor. Case classes are often sent to Actor as messages, and deep pattern matching of the contents of an object is a convenient way to "analyze" these messages.
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