Ruby Object Model Diagram

So if you re a ruby programmer you probably know that everything in ruby is an object.

Ruby object model diagram.

Using class ancestors included modules and superclass diagram the object model of these several commonly used ruby classes. Object includes the kernel module so object has all the instance methods of kernel like puts gets exit. It s true though everything in ruby is an object. There are just a few things that exist in ruby that you need to understand to really grok its object model.

Thus variables don t have a predefined type which conflicts with uml s static typed object model. It shows a snapshot of the detailed state of a system at a point in time thus an object diagram encompasses objects and their relationships which may be considered a special case of a class diagram or a. Since ruby 1 9 its hierarchy is like this. You can open your irb console and see it for yourself by typing.

When you write ruby code you are inside a main object that s why you can just write puts hello world instead of kernel puts hello world. Everything is an object. This is not an easy task since as the author comments. Likewise a static uml object diagram is an instance of a class diagram.

Ruby s extreme decoupling and duck typing philosophy doesn t judge a class by its hierarchy. Everything is an object or more precisely every box is this diagram is a basicobject. We now have a mental model for how ruby manages classes instances superclasses and modules but why does it matter. But another thing that s worth noting is ruby objects hierarchy.

As part of my compiler project one of my imminent decisions is what object model to use and sine i like ruby it seemed a good time to go through ruby and look at the guts of the ruby object model if you ve dabbled in meta programming etc. Differently from languages like java and c. Hash array string integer and float. A diagram showing superclass and eigenclass links between ruby objects but not the module inclusion links is available at www atalon cz.

Since 11 january 2012 there is a diagram containing module inclusion links. You can t get very far into ruby land without hearing that phrase. The interesting thing is how those objects are linked together and classified. This video taken from my ruby reloaded course digs deep into what s going.

Umlify uses yuml probably the most used uml textual tool to render the diagram. Object is an instance of a class in a particular moment in runtime that can have its own state and data values.