Pragmatic Scala

Using Implicit Conversions

Let’s create a practical example of implicit conversions using string interpolators. Scala has some nice built-in string interpolators—see ​String Interpolation​—but you can also create your own custom interpolators quite easily by using the concepts we’ve seen in this chapter. We’ll create a custom interpolator that will mask out select values from the processed string. To show that the interpolation can return something other than String—just about any object—we’ll return a StringBuilder as the result of processing the string. But first let’s revisit string interpolation to explore some concepts we need for the implementation.

When Scala sees the form

the compiler turns ...