Remove/undef a class method

Question

You can dynamically define a class method for a class like so:

class Foo
end

bar = %q{def bar() \"bar!\" end}
Foo.instance_eval(bar)

But h

Answer 1

This also works for me (not sure if there are differences between undef and remove_method):

class Foo
end

Foo.instance_eval do
  def color
    "green"
  end
end

Foo.color # => "green"

Foo.instance_eval { undef :color }

Foo.color # => NoMethodError: undefined method `color' for Foo:Class