why groovy when java 8 or scala, or…

Copyright © 2012 Russel Winder 1

Why Groovy When Java 8,Or Scala, Or…

Russel Winder

email: [email protected]: [email protected]

twitter: russel_winder

mailto:[email protected]


Aims, Goals and Objectives

● Show that Groovy cannot be complacent about it's place in the JVM-verse.

● Survive till the end of the session…


Structure

A beginning.

A middle.

An end.


Protocol

● Questions or short comments during the session are entirely in order.

● Let me know you have an interjection by raising your hand, and when I come to an appropriate pause, I'll pass you the token.

Questions, answers, comments, etc. appearingto get too long as interjections may get stackedto be unstacked at a break.


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Frontispiece


A Preface


Friends, programmers, humans,

lend me your ears;


I come to bury Groovy,not to praise it.


A Beginning


Staticallytypedlanguages

Dynamicallytypedlanguages

WAR


Static Typing Mandatory

● Compilers catch:● Incorrect use of types.● Silly spelling errors.

● Need fewer tests.

● Compiled direct to target:● Less overhead.● Faster

● Can work with big code bases because of the testable modularity.


Catch errors early, before execution.

Computational performance is all that matters.


Apart from correct implementation.


And the right functionality


And good user experience.


Dynamic is Inadequate

● Cannot program to interfaces.

● Have to write tests for things a compiler can (and should) catch trivially.

● Have to run the code to find out anything.

● Every action is “interpreted” and so slow.

● Difficult to work with big codebases.


Languages such as

Java, Scala, Kotlin, Ceylon

work where

Groovy, JRuby, Jython, Closure

result in incomprehensible codes.


Staticallytypedlanguages

Dynamicallytypedlanguages

Groovy


Groovy is in the middle of the battlefield by trying to be both dynamic and static.


Guillaume Laforge emphasized@TypeChecked and @StaticCompilein his GGeX 2012 opening keynote.


Guillaume Laforge emphasizedmaking Groovy static by default

in his GGeX 2012 opening keynote.


Why turn a perfectly good dynamic language into a static one?


Let's not worry too much about RPython and CPython and PyPy. Or perhaps we should…


Just use a good designed to be statically-typed language from the outset?


Scala

● Doesn't have the same data model as Java.● Is in it's own world effectively.● So Scala projects generally all Scala.


Ceylon

● Doesn't have the same data model as Java.● Is in it's own world effectively.● So Ceylon projects generally all Ceylon.

Ceylon supports optional typing!


Kotlin

● Doesn't have the same data model as Java.● Is in it's own world effectively.● So Kotlin projects generally all Kotlin.


If a language has to define it's owndata structures library then you begin

to think there is a problem.


Or perhaps the Java Collections framework is fundamentally broken?


Java 8

● Has exactly the same data model as Java.● Is the new world effectively.● So Java 8 projects generally all Java.

The only question is when to upgradefrom Java 5, 6 and 7 to Java 8.


Intermission


http://steveonjava.com/nighthacking/

http://steveonjava.com/nighthacking/


The fight is

JavaFX

vs.

GroovyFX


But, soft! what light through yonder window breaks?


A Middle


Jave 8 evolves the Collections framework by introducing public defender methods.


Backward compatibility assured.


Data Parallelism in Collections.


Data ParallelismTransform a sequence to another sequence all actions happen at the same time logically.


GPars redundant?


ActorsIndependent processes communicating via asynchronous exchange of messages

CSPSequential processes connected by channels using synchronous message exchange (rendezvous).

DataflowOperators connected by channels with activity triggered by arrival of data on the channels.


ActorsIndependent processes communicating via asynchronous exchange of messages


DataflowOperators connected by channels with activity triggered by arrival of data on the channels.


CSPSequential processes connected by channels using synchronous message exchange (rendezvous).


The End


To Groovy or not to Groovy…


…that is the question.


Is static Groovy a better language than Java 8?


Groovy has 6 months to stake it's claim to hegemony over the JVM space.


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DevoxxUK 2013

2013-03-26 & 2013-03-27

http://www.devoxx.com/display/UK13/Home

http://www.devoxx.com/display/UK13/Home


Why Groovy When Java 8,Or Scala, Or…

Russel Winder

email: [email protected]: [email protected]

twitter: russel_winder

mailto:[email protected]

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