get_class_methods.markdown

get_class_methods

In PHP, get_class_methods is used in two different ways. The first way is to pass in a class name string to get the methods. We can get a list of the public instance methods defined on a class in Ruby using Object.instance_methods.

{{code:php class Car { public function drive() {} private function brake() {} }

$result = get_class_methods('Car');
var_export($result);
// => array (0 => 'drive')

}}

{{code:ruby class Car def drive; end

  private
  def brake; end
end

p Car.instance_methods
# => ["inspect", "clone", "method", ...]

}}

The other way is to pass in an object instance of the class to get the methods. We can get a list of methods for an object in Ruby using Object#methods.

{{code:php $result = get_class_methods(new Car); var_export($result); // => array (1 => 'drive') }}

{{code:ruby p Car.new.methods # => ["inspect", "clone", "method", ...]
}}

In Ruby, all objects instances inherit from the a base Object, so we get a rather long list of methods -- including our user defined methods.

If we want to only see a list of user defined public methods, we can use the Enumerable#reject method to exclude all of the methods inherited from Object.

{{code:ruby p Car.new.methods.reject {|m| Object.methods.include?(m) } # => ["drive"] }}

{{related: classobj/get_class classobj/get_class_vars classobj/get_object_vars }}