Opal chapter 4_a_new_hope
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Opal presentation given at OC Ruby 7/25/2013
Transcript of Opal chapter 4_a_new_hope
WHO CODES RUBY?
WHO WORKS WITH THE WEB?
WHO LIKES JAVASCRIPT
WHO LIKES RUBY BETTER?
from http://dark--romance.deviantart.com/art/Screamy-and-
Bee-love-Ruby-146852940
YOU ARE MY AUDIENCE
THE PITCH
OPAL WILL MAKE YOU HAPPY
STEP BACK
(from:
)
http://www.celiajohnsononline.com/knee-exercises-osteoarthritis-joint-pain/
WHAT IS OPAL?Ruby to JS Source to Source, similar to CoffescriptRuntime (supports method missing, operator overloading,etc)
TOTALLY AWESOME
AS CODEclass Opal < Ruby include Browser::Access include Javascript::Interaction
runs_in :browser runs_in :nodeend
WHAT'S CURRENTLY UNDERGITHUB.COM/OPAL
PAGE 2
THE RUBY WAY
Matz wrote in an introductory article to Ruby
"For me the purpose of life is partly to have joy. Programmersoften feel joy when they can concentrate on the creative sideof programming, So Ruby is designed to make programmers
happy."
OPAL IS THE RUBY WAY
(from
)
http://www.get-covers.com/do-more-of-what-makes-you-happy/
OPAL IS JDD FOR MEJoy Driven Development
no need for it, but I can't stop codingForrest just loves to write opal (Test Infected parody)
WHAT IF YOU CODE RUBY IN THE BROWSER?
TOP 7 REASONS WHY OPAL WILL MAKE YOUHAPPY
1. It is a viable Ruby2. Greenspun's 10th Rule, Opal Edition3. Solves things the Ruby way4. Tools you already know and love5. Easy integration with Ruby6. Better tools (In Browser)7. A new future
#1 VIABLE - NOT A TOYIn production - 5 + apps, 2 more coming soonReal Ruby1.9.3 - compliant (mostly)passes 1377 rubyspec examplesruns asciidoc gem unmodifiedruns mspec gem unmodifiedcan compile itself
Capable of compiling complex codeIs written in Ruby, easy to contribute
RUBY LANGUAGE FEATURES IN OPALclassesmodules & mixinssingleton methodsmethod_missingarity checkslambdablocksyieldCONSTANTSglobal variables
MORE FEATURESclass variablesinstance variableEnumerableBasicObjectKernelNilClassRangeHashString InterpolationHeredocs%w splits
DON'T UNDERESTIMATE THE POWER OF ABETTER LANGUAGE
opal-irb, opal-inspector, easy to writeleads us to Greenspun's 10th rule
GREENSPUN'S 10TH RULEAny sufficiently complicated C or Fortran program contains
an ad hoc, informally-specified, bug-ridden, slowimplementation of half of Common Lisp.
#2 GREENSPUN'S 10TH RULE, OPAL EDITIONAny sufficiently complicated Javascript program contains an
ad hoc, informally-specified, bug-ridden, slow implementationof half of Ruby
JAVASCRIPT EFFORTS THAT IMITATE RUBY ORRAILS
PROTOTYPE
UNDERSCORE
STRUKT
STRINGJS
HTTP://YEHUDAKATZ.COM/2012/01/10/JAVASCRIPT-NEEDS-BLOCKS/
HTTP://WWW.CODEPROJECT.COM/ARTICLES/31452/RAIYA-IN-HUMAX-V0-3-EXTENDING-YOUR-JAVASCRIPT-CLAS
ACTIVEJS
REDSCRIPT
FORML
OTHER ATTEMPTS TO DO RUBY ON JS
(from:
)
https://github.com/jashkenas/coffee-script/wiki/List-of-languages-that-compile-to-JS
WHY NOT THE REAL THING?
OPAL IS RUBY
#3 SOLVING THINGS THE RUBY WAYpackaging/modulesjavascript integrationtesting
PACKAGING AND MODULE
JAVASCRIPT MODULES long article
AMDCommonJSHarmony
http://addyosmani.com/writing-modular-js/
MODULESDo This
define( module_id /*optional*/, [dependencies] /*optional*/, definition function /*function for instantiating the module or object*/);// Consider 'foo' and 'bar' are two external modules// In this example, the 'exports' from the two modules loaded are passed as// function arguments to the callback (foo and bar)// so that they can similarly be accessed
And Thisrequire(['foo', 'bar'], function ( foo, bar ) { // rest of your code here foo.doSomething();});
RUBYrequireuses gems
require 'file_or_gem_you_want'
OPALrequireuses gemsopal-sprockets handles requiresalso include templates
require 'file_gem_template_you_want'
FOR NON RAILS STANDALONE - RAKEFILErequire 'bundler/setup'# require 'opal/rake_task'require 'opal'require 'opal-sprockets'
desc "build jqconsole based irb"task :build_jqconsole do
File.open("js/app-jqconsole.js", "w+") do |out| env = Opal::Environment.new env.append_path "examples" env.append_path "opal" out << env["app-jqconsole"].to_s end # system "terminal-notifier -title 'opal-irb build' -message 'js file built'" system "open -a 'Google Chrome' index-jq.html"end
FOR NON RAILS STANDALONE APP-JQCONSOLE.RBrequire 'opal'require 'opal-jquery'require 'opal-parser'require 'opal_irb_jqconsole'
Document.ready? do OpalIrbJqconsole.create("#console")end
JAVASCRIPT INTEGRATIONx strings (backticks %x)method missing
window = windowwindow.location
TESTINGopal-specrake/phantomjsin browser
OPAL-SPEC
#4 THE TOOLS YOU KNOW AND LOVElanguage - Rubyeditor - emacs, vim, sublime, Rubymine, etc.Rakerspec (sorry DHH)guard<fill in the ruby tool> - remember it's just Ruby
#5 EASY INTEGRATION WITH RUBYopal-railsopal-sprockets (already shown in modules)it's Ruby
#6 NEW IN BROWSER TOOLSopal-irbopal-inspector
OPAL-IRBirb for opalhistoryreadline controlsmultiline edit (over all of history)send a link - live gist
OPAL-INSPECTORinspired by amber.js in browser Smalltalk like code browserchange the paradigm of developmentdevelop in browser w/better toolspersistent live Opal objects is similar to Smalltalk image
DEMOSopal-irbopal-inspectorSource Maps (head has broken it somewhat though)
QUICK LOOK AT CODEonly 440 lines for opal-inspector current statevery short, small classesdidn't need a framework
#7 A NEW FUTURE (HOPE)in browser dev, goodness from Smalltalk, Ruby and LispMachinesmeteor.js like same code on both sides
blurring front and back1 language…
THERE CAN ONLY BE ONE
May that language be Ruby/Opal
CALL TO ARMSthings are goodthey can be betterneed your help
HELPtry it outtalk, google group, ircdocumentcontribute, it's just Rubyhave fun
KISS JAVASCRIPT GOODBYE
Created by fkchang.
