Optional brackets around lambda expression

[Steven Simpson]

On 15/06/11 21:42, Pavel Minaev wrote:
> Note that this applies also to "Redmond syntax" in general; e.g.:
>
>    new User().use(x => x + "a string");

Ah - I only looked at the options in the original "Syntax poll", where
expressions were in braces for Redmond.

> On Wed, Jun 15, 2011 at 1:35 PM, Yuval Shavit <yshavit at akiban.com
> <mailto:yshavit at akiban.com>> wrote:
>
>     What would happen with something like:
>
>      public interface Sam {
>        String doSomething(String arg);
>      }
>      public class User {
>        public void use(Sam sam) { System.out.println("saw a sam"); }
>        public void use(String string) { System.out.println("saw a
>     string"); }
>      }
>
>      new User().use( #(x) x + "a string" );
>
>     In that context, which are we passing?
>       - lambda that takes a String, concatenates "a string" to it and
>     returns
>     the result
>

Yes.

>       - a string consisting of (lambda x -> x).toString() concatenated
>     with "a
>     string"
>

For that, you write (#(x) x) + "a string" - ordinary expression brackets
can still be used, but are only necessary in the more contrived cases.