property_exists

  • There are no public class properties of objects in Ruby. Ruby instead uses public methods as properties. Checking if a method exists for a class in Ruby is is discussed in method_exists.

    In Ruby we can use the Module#attr_reader method as a way of easily creating accessor methods for instance variables within a class. This is vaguely similar to having a public property.

    PHP

    class Car {
  public $doors;
}
$car = new Car;
$exists = property_exists($car, 'doors');
var_export($exists);
// => true

    Ruby

    class Car
  attr_reader :doors
end
 
car = Car.new
p respond_to?(:doors)
# => true

    see also

← printf range →

Looking for Rails or PHP web application development, integration, and training?

Rails for PHP is brought to you by Maintainable Software. Get custom web applications and personalized training from the authors of the book and website.