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Drew Colthorp www.atomicobject.com iPhone, meet Ruby

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@atomicobject http://spin.atomicobject.com A Tour of RubyMotion • Implementation of Ruby • Similar object model to Objective C, natural language for the platform • UNIX Ethos • Very Flexible

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From our app directory, we can run our app in the simulator with a simple command.

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From-scratch implementation of Ruby. Started by apple in 2007.

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© HipByte SPRL

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© HipByte SPRL

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@atomicobject http://spin.atomicobject.com Garbage Collection (Sort of. Auto-release and retain, similar to ARC.)

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(App idea shamelessly ripped off from HipByte.)

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@atomicobject http://spin.atomicobject.com Ruby

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Classes and methods; no header files; rest arguments. What you don’t see in the usual case is the flexibility of Ruby.

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Method invocation syntax.

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Keyword args: added to RubyMotion for Obj-C compatibility, now standard in Ruby 2.0.

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do is syntax for blocks. Very similar to Objective C blocks parent= is just a method assumed to exist on el. Aliases to setParent if el is an Objective C object.

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These features of ruby make it great for creating internal DSLs. Why create separate parsers for incomplete languages when your primary language is so flexible?

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Unlike most languages, there are no contexts where you can’t put code. For example, within a class definition, you can do whatever you want.

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For example, we could put a print statement in our class def.

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This is how you’d normally write it.

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Checking of valid objects in ActiveRecord validates is a method on class objects inheriting from ActiveRecord::Base

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@atomicobject http://spin.atomicobject.com Rake

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@atomicobject http://spin.atomicobject.com Specs

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@atomicobject http://spin.atomicobject.com REPL

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Now, if we hold command and click on an element, the context of our REPL changes to the clicked element. Right now our REPL says (main), meaning we haven’t clicked an element.

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If we command-click our text-box, we see UILabel:0xf975. Now “self” refers to that element.

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So we can set self.backgroundColor to see it change to red. Or we can tweak frame size to get the positioning just right.

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@atomicobject http://spin.atomicobject.com What about Objective-C?

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@atomicobject http://spin.atomicobject.com Apps

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© 37signals

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@atomicobject http://spin.atomicobject.com The End