Ruby Object Model Diagram

Object includes the kernel module so object has all the instance methods of kernel like puts gets exit.

Ruby object model diagram.

There are just a few things that exist in ruby that you need to understand to really grok its object model. This is not an easy task since as the author comments. How does ruby internally represent and connect classes objects superclasses etc. Using class ancestors included modules and superclass diagram the object model of these several commonly used ruby classes.

Ruby s extreme decoupling and duck typing philosophy doesn t judge a class by its hierarchy. For ruby this post probably doesn t contain much new stuff for you. You can t get very far into ruby land without hearing that phrase. 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.

We now have a mental model for how ruby manages classes instances superclasses and modules but why does it matter. This video taken from my ruby reloaded course digs deep into what s going. But another thing that s worth noting is ruby objects hierarchy. Everything is an object.

Object is an instance of a class in a particular moment in runtime that can have its own state and data values. Since ruby 1 9 its hierarchy is like this. Thus variables don t have a predefined type which conflicts with uml s static typed object model. Umlify uses yuml probably the most used uml textual tool to render the diagram.

Differently from languages like java and c. Likewise a static uml object diagram is an instance of a class diagram. A diagram showing superclass and eigenclass links between ruby objects but not the module inclusion links is available at www atalon cz. It s true though everything in ruby is an object.

You can open your irb console and see it for yourself by typing. Since 11 january 2012 there is a diagram containing module inclusion links. 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. If you re a beginner you may want to look at a tutorial instead.

So if you re a ruby programmer you probably know that everything in ruby is an object. The interesting thing is how those objects are linked together and classified.