Java 8 lambda syntax decided - same as C# and Scala • Hacker News Board

Re: Java 8 lambda syntax decided - same as C# and Scala

#21

Post by jeffz » Fri, Sep 09, 2011, 1:56 AM UTC

MatthewPhillips wrote: post #15

swax wrote: post #14

Earlier quoted context omitted.

Actually for just that example you don't need any of it. new Thread(doStuff).Start();

nah, it would have to be new Thread(new ThreadStart(doStuff)).Start();

Sorry, but since C# 2.0 we could just write "new Thread(DoStruff)" or "SomeDelegate del = SomeMethod".

Re: Java 8 lambda syntax decided - same as C# and Scala

#22

Post by calebmpeterson » Fri, Sep 09, 2011, 2:03 AM UTC

Locke1689 wrote: post #20

calebmpeterson wrote: post #16

try { // for a really long time } finally { // made a decision }

try { /* for a really long time */ } finally { /* made a decision */ }

Please tell me how you got it formatted like code. I tried a block quote and got italics instead.

Re: Java 8 lambda syntax decided - same as C# and Scala

#23

Post by koenigdavidmj » Fri, Sep 09, 2011, 2:05 AM UTC

calebmpeterson wrote: post #22

Locke1689 wrote: post #20

Earlier quoted context omitted.

try { /* for a really long time */ } finally { /* made a decision */ }

Please tell me how you got it formatted like code. I tried a block quote and got italics instead.

    Indent by four spaces.

Re: Java 8 lambda syntax decided - same as C# and Scala

#24

Post by keiferski » Fri, Sep 09, 2011, 2:23 AM UTC

koenigdavidmj wrote: post #23

calebmpeterson wrote: post #22

Earlier quoted context omitted.

Please tell me how you got it formatted like code. I tried a block quote and got italics instead.

Indent by four spaces.

  I think two spaces are enough

Re: Java 8 lambda syntax decided - same as C# and Scala

#25

Post by zmmmmm » Fri, Sep 09, 2011, 2:25 AM UTC

Nice to see pragmatism playing a role here. A big problem with Java has always been the "design by committee" nature of it where we end up with some theoretical best case that satisfies everyone's egos but turns out to utterly suck when used in practice.

From another point of view ... it's a shame we needed so many years to come up with "let's do it like C#".

Re: Java 8 lambda syntax decided - same as C# and Scala

#26

Post by linuxhansl » Fri, Sep 09, 2011, 2:25 AM UTC

MatthewPhillips wrote: post #5

Lambdas are a lot of fun on C#. new Thread( => { doStuff(); }).Start();

Big deal:

    new Thread(new Runnable() { public void run() {doStuff();} }).start();

Re: Java 8 lambda syntax decided - same as C# and Scala

#27

Post by zokier » Fri, Sep 09, 2011, 2:30 AM UTC

Any details on variable capturing from outer scope? The same as C# (apparently capture all variables?)?

Re: Java 8 lambda syntax decided - same as C# and Scala

#28

Post by zokier » Fri, Sep 09, 2011, 2:33 AM UTC

calebmpeterson wrote: post #16

try { // for a really long time } finally { // made a decision }

  try { /* thinking for a really long time */ } catch (TimeoutException ex) { /* copy from C# */ }

Re: Java 8 lambda syntax decided - same as C# and Scala

#29

Post by jpitz » Fri, Sep 09, 2011, 2:49 AM UTC

jinushaun wrote: post #11

Good. The lambda syntax in C# rocks and is a natural fit for Java considering the origin of C#.

Object Pascal?

Re: Java 8 lambda syntax decided - same as C# and Scala

#30

Post by vorg » Fri, Sep 09, 2011, 2:57 AM UTC

calebmpeterson wrote: post #16

try { // for a really long time } finally { // made a decision }

There's a JVM language out there that initially allowed try-statements without catch or finally clauses, e.g

    try{
      //for a short time only to decide
    }

But one of its despots, five years after the language was first released, changed the syntax to make a catch or finally clause compulsory, e.g

    try{
      //for a short time to decide
    }finally{}

Because I had used these standalone try-statements a lot, I had to go thru all my code and add empty finally statements to them all.

Scala, on the other hand, still allows standalone try-statements. And Scala and C# also have a better closure syntax than that language, and are more worthy to be copied by Java 8.