Re: Combinators

As I see, you will need to figure out how implicit works.
You can google it, or read some kind of introduction to Scala.

In short, it is *implicit*, and is applied when compiler finds it necessary.

Thanks,
-Vlad

On Sat, Jan 31, 2015 at 8:50 AM, <[email protected]> wrote:

> I started reading Scala in Action as my first Scala book (I've come to
> realize this book is way too advanced for beginners, i am struggling
> mightily).
>
> I need help with the following.
>
> object Combinators {
>   implicit def kestrel[A](a: A) = new {
>     def tap(sideEffect: A => Unit): A = {
>       sideEffect(a)
>       a
>     }
>   }
> }
>
> case class Person(firstName: String, lastName: String)
> case class Mailer(mailAddress: String) {
>   def mail(body: String) = {
>     println("send mail here...")
>   }
> }
>
> object Main {
>   import Combinators._
>   def main(args: Array[String]): Unit = {
>     Person("Nilanjan", "Raychaudhuri").tap(p => {
>       println("First name " + p.firstName)
>       Mailer("some address").mail("new person joined " + p)
>     }).lastName
>   }
> }
>
> My questions are as follows:
> 1) How does Person automatically get access to "tap"?
>  2) What does the implicit keyword do here? (am guessing this might answer
> q #1)
> 3) Any other book suggestions for a Java guy trying to learn Scala. (I've
> got about 10 years of Java experience, if that helps).
>
> Thanks in advance.
>
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