Why Groovy When Java 8 or Scala, or…

Why Groovy When Java 8,
Or Scala, Or…

Russel Winder
email: russel@winder.org.uk
xmpp: russel@winder.org.uk
twitter: russel_winder

Copyright © 2012 Russel Winder 1

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. appearing
to get too long as interjections may get stacked
to 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


Statically Dynamically
typed WAR typed
languages languages


Static Typing Mandatory
● Compilers catch: ● Compiled direct to
● Incorrect use of types. target:
● Silly spelling errors. ● Less overhead.
● Need fewer tests. ● 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 ● Every action is
interfaces. “interpreted” and so
● Have to write tests for slow.
things a compiler can ● Difficult to work with
(and should) catch big codebases.
trivially.
● Have to run the code to
find out anything.


Languages such as

Java, Scala, Kotlin, Ceylon

work where

Groovy, JRuby, Jython, Closure

result in incomprehensible codes.


Statically Dynamically
typed Groovy typed
languages languages


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


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


Guillaume Laforge emphasized
making 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
● So Ceylon projects generally all Ceylon.

Ceylon supports optional typing!


Kotlin
● So Kotlin projects generally all Kotlin.


If a language has to define it's own
data 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 upgrade
from Java 5, 6 and 7 to Java 8.


Intermission


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 Parallelism
Transform a sequence to
another sequence all
actions happen at the same
time logically.


GPars redundant?


Dataflow
Operators connected by
Actors channels with activity
Independent processes triggered by arrival of
communicating via data on the channels.
asynchronous exchange
of messages

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

Actors
Independent processes
communicating via
asynchronous exchange
of messages


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


CSP
Sequential 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.


Surreptitious Advertisement


DevoxxUK 2013

2013-03-26 & 2013-03-27

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


Why Groovy When Java 8,
Or Scala, Or…

Russel Winder
email: russel@winder.org.uk
xmpp: russel@winder.org.uk
twitter: russel_winder


Why Groovy When Java 8 or Scala, or…

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