Introduction to JVM languages and Fantom (very brief)
Download as PPTX, PDF2 likes941 views
JVM languages provide more expressiveness and help modernize programming languages. Fantom is a JVM language that compiles to JVM, CLR, and JavaScript. It is a multi-paradigm language that supports object-oriented, functional, static and dynamic typing. Fantom aims to reduce boilerplate code through features like mixins, concise accessors, null-safe fields, and closures. It also provides actor-based concurrency and foreign function interfaces.
![Concurrency with Actors
pool := ActorPool()
["one", "two", "three", "four"].each {
a := Actor(pool) |Str name| {
echo("Thread $name says Hello World!")
}
a.send(it)
}](https://image.slidesharecdn.com/wkudcjzvtlin8xvwmcjx-signature-24718854489de1d4940a81d8acd9b7cee3e085596edd8c7c4d8abdb63b7d1dfd-poli-150311083302-conversion-gate01/85/Introduction-to-JVM-languages-and-Fantom-very-brief-31-320.jpg)
Introduction to JVM languages and Fantom (very brief)
- 1. Introduction to JVM Languages and Fantom @jph98
- 2. Welcom e...
- 3. What I’ll Cover JVM languages and a brief history Where Fantom fits into the JVM language landscape Characteristics of the Fantom and a few examples
- 5. Java Source Code JIT Compiler x86 Native Code JIT Compiler x86_64 Native Code Bytecode Compiler Compiler Fantom Source Code JVM JVM
- 6. Why do we need JVM languages? More expressive, dynamic, functional Reduce amount of “boiler plate” code A way of modernising and pushing the language forward
- 7. Da Vinci Machine Project Project to extend the JVM for supporting other languages: - Tail call optimisation - Interface injection - Dynamic invocation - Continuations
- 8. Language Categories General purpose languages focusing on a specific paradigm Languages translated from other languages Paradigm specific or multi paradigm languages
- 9. Quiz Anybody care to guess how many JVM languages there are?
- 11. General Purpose Languages Functional Languages (e.g. Frege) Dynamically Typed Languages (e.g. JRuby) Multi Paradigm Languages (e.g. Scala)
- 12. Languages Translated to the JVM Ada JGNAT Go JGo Lisp CLforJava JS Nashorn Pascal Free Prolog JLog Python Jython R Renjin REXX Netrexx Ruby JRuby Scheme Bigloo Tcl Jacl
- 13. Specific Purpose Languages Parallel Programming - Ateji (Commercial) - Chapel (Developed by Cray) - X10 (Developed by IBM) Visualisation and animation - Processing
- 14. CLR Languages (CLI) .NET CLR also has a number of languages: Boo (Python esque) P# (Prolog) IKVM (Java) Phalanger (PHP) IronRuby IronPython
- 16. Overview Originally called Fan, created by Brian Frank and Andy Frank Academic Free License I’m covering this as an alternative to the standard Scala, Clojure yada yada...
- 17. Intent Provide a language that compiles to: - JVM (Java) - JavaFFI - CLR (.NET) - DotnetFFI - Browser (Javascript) - Produces fcode (intermediate CLR/JVM/JSVM) code
- 18. Ecosystem Overview Focus on providing elegant API’s Provides a REPL Modules in the form of Pods Desktop (FWT) and web (Webmod)
- 19. Characteristics Object Oriented, Functional Static and Dynamic Typing (Choice of) 64 bit Float, Int, Decimal + Str, Bool Duration, Uri, Slot, Range, List, Map
- 21. Classes Public and abstract Can also be Final, Const or Internal Example...
- 22. Mixins Like interfaces, but with method implementations. Public defender methods. Can group a number of slots together for reuse Can’t contain state, you need to provide own
- 23. Mixing Static and Dynamic person.addAddress(“New Bond House”); person->addAddress(“New Bond House”);
- 24. Reducing Boilerplate Code Concise in places, optional setters/getters Null safe fields, elvis operator
- 25. Accessors, optional sets/gets Accessors: class Person { Str name Int age }
- 26. Null Check Operators (Elvis) name ?: “No name specified” Variables can also be marked nullable or non-nullable
- 27. Closures Closure can be thought of as a function that can be stored in a variable Can access variables in same scope as defined Useful for event handling
- 28. Closure Examples 10.times |i| { echo(i) } 10.times { echo(it) }
- 29. Closure Examples Str first := “Bart” Str last := “Simpson” f := |->Str| { return first + “ “ + last }
- 30. Actor Concurrency System Works around a message passing model Actor is responsible for specific tasks Lets take a look at a counter example...
- 31. Concurrency with Actors pool := ActorPool() ["one", "two", "three", "four"].each { a := Actor(pool) |Str name| { echo("Thread $name says Hello World!") } a.send(it) }
- 32. FFI - Foreign Function Interface JavaFFI - Java type system into Fantom DotnetFFI - not available yet Use native classes to provide functionality
- 33. DSL’s - Domain Specific Languages StrDSL RegexDSL Can write your own using the DslPlugin
- 34. Conclusions Impressive set of features for the language Some useful constructs to avoid boilerplate code Main focus in Java and JS. Looking for .NET contributors for the DotNetFFI.
- 35. Conclusions There’s a lot more to cover here in terms of learning… Where are the JVM languages going? Java 8, Java 9… inclusions...