core_ext.js.rb

module Kernel
  def p *args
    `console.log.apply(console, args)`
  end
end

class Array
  def -(other)
    reject { |i| other.include? i }
  end
end

class Element
  def up selector
    parent = `#{jquery}.parents(#{selector})[0] || nil`
    Element.new(parent) if parent
  end
  
  def down selector
    child = `#{jquery}.find(#{selector})[0] || nil`
    Element.new(child) if child
  end
  
  def [] name
    `#{jquery}.attr(#{name})`
  end
  
  def data name
    `#{jquery}.data(#{name}) || nil`
  end
  
  def jquery
    @jquery ||= `$(#{@el})`
  end
  
  def visible?
    `#{jquery}.is(':visible')`
  end
  
  attr_reader :el
  
  alias to_s inspect
  
  def class_names
    class_name.strip.split(/\s+/)
  end
end