Ruby v JS

oo.js

Foo = function(bar) {
  this.bar = bar;
}

foo = new Foo('baz');
foo.bar = 'qux';
// This works.

oo.rb

class Foo; end

foo = Foo.new
foo.bar = :baz
# This raises an exception

class Foo
  attr_accessor :bar
end

foo = Foo.new
foo.bar = :baz
# This works. Feels weird.