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# HoboSupport - Metaid
doctest_require: '../../lib/hobosupport'
{.hidden}
Why the Luck Stiff's essential meta-programming additions to Object. These are probably distributed elsewhere, but they're small enough to throw them in to HoboSupport and remove an external dependency.
## `Object#metaclass`
Returns the "metaclass" (bad name) or "singleton class" of a given ruby Object
>> o = Object.new
>> def o.foo; ;123; end
>> o.foo
=> 123
>> o.metaclass.instance_methods.grep "foo"
=> ["foo"]
## `Object#meta_eval`
* `object.meta_eval(string)`
* `object.meta_eval { block }`
Evaluates ruby source or a block in the context of the metaclass.
>> File.meta_eval "alias_method :b, :basename"
>> File.b "a/b"
=> "b"
And with a block
>> File.meta_eval { alias_method :b2, :basename }
>> File.b2 "a/b"
=> "b"
## `Object#metaclass_eval`
* `object.metaclass_eval(string)`
* `object.metaclass_eval { block }`
Like `#meta_eval`, but does a `class_eval` instead of an `instance_eval`
>> File.metaclass_eval "def b3(path); basename(path); end"
>> File.b3 "a/b"
=> "b"
And with a block
>> File.metaclass_eval { def b4(path); basename(path); end }
>> File.b4 "a/b"
=> "b"
## `Object#meta_def`
>> String.meta_def(:backwards_new) { |s| s.reverse }
>> String.backwards_new "strange"
=> "egnarts"
Version data entries
6 entries across 6 versions & 1 rubygems