class

Today I’m sharing some examples of the Scala Option/Some/None syntax. These examples will show how to use an Option for the var fields in a Scala class. Then I’ll show how to set those Option fields, and then get the values from the Option fields.

To get started, we’ll need a little case class to represent an Address:

Scala case class FAQ: When you create a case class in Scala, a copy method is generated for your case class. What does this copy method do?

In short, it lets you make a copy of an object, where a "copy" is different than a clone, because with a copy you can change fields as desired during the copying process.

To demonstrate this, let's create an Employee class as a case class:

Scala FAQ: Can you share an example of how to create an implicit class in Scala 2.10?

Sure. As your question implies, the implicit class functionality changed in Scala 2.10, so let's take a look at the new syntax.

When you're working in the Scala REPL and want to see what methods are available on a class/object, you can create an instance of an object, follow that with the "." character, and then press the [Tab] key. This process, known as "tab completion" in the REPL, gives you a preliminary list of methods that can be called on the object.

Here's what this looks like when we try it on an Int object:

As a Scala newbie, I'm curious about how the process of converting a Scala class back to Java source code works. What I really want to see is how my Scala source code is converted to Java source code. Besides plain old curiosity, I think that understanding more about how Scala works can also be very important to my understanding of Scala (such as the apply() method, and so on).