something like Clojure's "doto"?

scala> def doto[A](a: A)(todos: (A=>Any)*) = todos.foldLeft(a){
(a,todo) => todo(a); a }
doto: [A](A)((A) => Any*)A

scala> doto(new java.util.HashMap[String,Int])(_.put("a",1),_.put("b",2))
res0: java.util.HashMap[String,Int] = {b=2, a=1}

On Wed, Jul 8, 2009 at 3:03 PM, Raoul Duke wrote:
> hi,
>
> is there / how might one implement something like
> http://clojure.org/java_interop#toc15 to get (even more) succinctness
> in Scala?
>
> many thanks.
> (i am experimenting with writing it on my own but am so far kinda lost.)
>

> scala> def doto[A](a: A)(todos: (A=>Any)*) = todos.foldLeft(a){
> (a,todo) => todo(a); a }

many thanks! i suspect i'll be unraveling that a while :-) i mean, i
do get the gist, i'm just behind on what-all Scala can do.

Or by importing all the object's members into the scope,

scala> def doto[X](x: X)(f: X => Unit) = { f(x); x }
doto: [X](X)((X) => Unit)X

scala> doto(new java.util.HashMap[String,Int]) { x => import x._
     |   put("a", 1)
     |   put("b", 2)
     | }
res1: java.util.HashMap[String,Int] = {b=2, a=1}

alex

On Wed, Jul 8, 2009 at 3:10 PM, David Hall <dlwh@cs.stanford.edu> wrote:

scala> def doto[A](a: A)(todos: (A=>Any)*) = todos.foldLeft(a){
(a,todo) => todo(a); a }
doto: [A](A)((A) => Any*)A

scala> doto(new java.util.HashMap[String,Int])(_.put("a",1),_.put("b",2))
res0: java.util.HashMap[String,Int] = {b=2, a=1}


On Wed, Jul 8, 2009 at 3:03 PM, Raoul Duke<raould@gmail.com> wrote:
> hi,
>
> is there / how might one implement something like
> http://clojure.org/java_interop#toc15 to get (even more) succinctness
> in Scala?
>
> many thanks.
> (i am experimenting with writing it on my own but am so far kinda lost.)
>

Wow, wow. So Scala has to catch up now!...
Yes, this is a beautiful construct.

2009/7/8 Raoul Duke <raould@gmail.com>

hi,

is there / how might one implement something like
http://clojure.org/java_interop#toc15 to get (even more) succinctness
in Scala?

many thanks.
(i am experimenting with writing it on my own but am so far kinda lost.)

--
Thanks,
-Vlad

Hello!
This seems also impressive to me, now i try to see this construct in a
broader context. So it's main purpose would be to encapsulate the
instantiation and method invocation with certain parameters in one
construct. Am I missing something essential, else here?

regards andreas

Vlad Patryshev wrote:
>
> Wow, wow. So Scala has to catch up now!...
> Yes, this is a beautiful construct.
>
> 2009/7/8 Raoul Duke
>
>> hi,
>>
>> is there / how might one implement something like
>> http://clojure.org/java_interop#toc15 to get (even more) succinctness
>> in Scala?
>>
>> many thanks.
>> (i am experimenting with writing it on my own but am so far kinda lost.)
>>
>
>
>

> scala> def doto[A](a: A)(todos: (A=>Any)*) = todos.foldLeft(a){
> (a,todo) => todo(a); a }
> doto: [A](A)((A) => Any*)A
>
> scala> doto(new java.util.HashMap[String,Int])(_.put("a",1),_.put("b",2))
> res0: java.util.HashMap[String,Int] = {b=2, a=1}

there are extra () around the "todos", is that required to make this
all work? when i try to not have them the REPL says that the
underscores are confusing "missing parameter type blah blah".

i'm a little worried about how hard it is to understand the seemingly
special cases of magic syntax in Scala to get ideas in my head
translated into code that really does what i want :-}

thanks.