Re: Re: Combinators

On 01/31/2015 05:59 PM, [email protected] wrote:
> Also what is this line doing here?
>
>   implicit def kestrel[A](a: A) = new {
>
> What does "new" do in this context? a new function?
It represents an anonymous class, in short notation:

scala> new {}
res0: AnyRef = $anon$1@67424e82

scala> new Object {}
res1: Object = $anon$1@51521cc1

>
> On Saturday, January 31, 2015 at 10:50:05 AM UTC-6, 
> [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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