hash_assignment.rb

class Cacher
 
  def initialize
    @cache = {}
  end
 
  def expensive(a)
    "Foobar: #{a}"
  end
 
  def cached(selector)
    # If using parantheses it would work:
    # @cache['bla'] ||= expensive(selector)
    # The following breaks with Opal:
    @cache['bla'] ||= expensive selector
  end
end
 
cache = Cacher.new
puts cache.cached('foo').inspect