Object model
************

An ``Object``, simply
=====================

.. pharo:autocompiledmethod:: EssentialsObjectTest>>#testInspectObject

  .. image:: ../../../Containers-Essentials/images/EssentialsObjectTest-testInspectObject.svg
    :align: center
    
``nil``, even more simpler
==========================

.. pharo:autocompiledmethod:: EssentialsObjectTest>>#testInspectNil

  .. image:: ../../../Containers-Essentials/images/EssentialsObjectTest-testInspectNil.svg
    :align: center

``true`` and ``false``
======================

On one hand, *truthness* is encoded by,

.. pharo:autocompiledmethod:: EssentialsObjectTest>>#testInspectTrue

  .. image:: ../../../Containers-Essentials/images/EssentialsObjectTest-testInspectTrue.svg
    :align: center

 
On the other hand, *falsehood* is encoded by,

.. pharo:autocompiledmethod:: EssentialsObjectTest>>#testInspectFalse

  .. image:: ../../../Containers-Essentials/images/EssentialsObjectTest-testInspectFalse.svg
    :align: center

``Object`` class and its superclasses 
=====================================

..
.. pharo:autocompiledmethod:: EssentialsObjectTest>>#testInspectObjectModel

.. image:: ../../../Containers-Essentials/images/EssentialsObjectTest-testInspectObjectModel.svg
  :align: center

``Trait`` class
+++++++++++++++

First introduced in :cite:`10.1007/978-3-540-45070-2_12` then extended in
:cite:`10.1145/1119479.1119483`, traits are another mechanism to define
behavior. Some applications can be found in both :cite:`10.1145/949343.949311`
and :cite:`CASSOU20092`, also a wiki page exists at :cite:`pharowiki-traits`.

.. image:: ../../../Containers-Essentials/images/EssentialsObjectTest-testInspectTraitModel.svg
  :align: center

As a real case, the class definition

.. pharo:autoclass:: CollectionRootTest

is an example of traits usage and its inspection produces

.. image:: ../../../Containers-Essentials/images/EssentialsObjectTest-testInspectCollectionRootTest.svg
  :align: center