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monkey

Monkey is a smart, scoped monkeypatching library. You can define monkeypatches via an intuitive DSL, and apply them only to scoped blocks, assured that your changes won't leak out to objects outside your scope.

Usage

Monkeypatching objects

# define the "metaclass" monkeypatch on Object
Monkey.see(Object) do
  def metaclass
    class << self; self; end
  end
end

# patch Object to include the "metaclass" monkeypatch for the duration of
# the block
Monkey.patch(Object, :metaclass) do
  "foo".metaclass # => #<Class:#<String:0x1016d7570>>
end

# the monkeypatch doesn't make it out of the scope
"foo".metaclass # => NoMethodError

# patch Object to include the "metaclass" monkeypatch
Monkey.patch(Object, :metaclass)

# the monkeypatch persists
"foo".metaclass # => #<Class:#<String:0x1016d7570>>

Monkeypatching classes

# define the "foo" and "bar" monkeypatches on the class-level of Object
Monkey.see(Object.metaclass) do
  def foo
    Kernel.rand
  end

  def bar
    "hello!"
  end
end

Monkey.patch(Object.metaclass, :foo, :bar) do
  Object.foo # => 0.571499912853919
  Object.bar # => "hello!"
end

Monkeypatching instances

# define the "metaclass" monkeypatch on Object
Monkey.see(Object) do
  def metaclass
    class << self; self; end
  end
end

a = "foo"

Monkey.patch(a, :metaclass) { a.metaclass }