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In this video, I’d like to show 
you a tip with Nautilus.

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And just for you to know: 
Nautilus is the submarine name

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in Jules Verne’s “20 000 
Leagues Under the Sea” 

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Nautilus enables to navigate
under the seas so it suits

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very very well to Pharo.

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Let’s have a look to the
OrderedCollection class.

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It is defined in the
Collection-Sequenceable package.

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In this package, there are several
core classes of the system.

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There is the Array class, 
the Interval class, LinkedList class.

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I can see that in the package
there is

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the OrderedCollection class which
has a sub-class, SortedCollection.

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Now what I can also see,

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which is not expressed in
a graphical way,

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it is that OrderedCollection is
a sub-class of SequenceableCollection.

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Sometimes, I would like to

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navigate inside the super-class
in order to see which

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methods are redefined or 
this kind of thing.

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To do this, I click on
Inheritance.

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Hence, I see the hierarchy, 
I see the super-class

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of OrderedCollection,
SequenceableCollection and its hierarchy.

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I also see that there are other sub-classes
of OrderedCollection

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in other packages,
and I see that

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SortedCollection is a sub-class
of OrderedCollection,

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this is in black, I am 
still in the package 

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containing OrderedCollection.

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So, like this, I can browse, 
and see

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the methods which are 
in other packages.

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Now, if I unselect
this mode while I’m on

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the super-class,
what will I see?

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I will see the class package.

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So, the SequenceableCollection
class is in the

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Collection-Abstract package.

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So now if I ask again to see the
inheritance,

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I will see all the 
sub-classes and super-classes 

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inheritance of
SequenceableCollection.

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I see that
SequenceableCollection inherits from

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Collection in the same package, 
that it defines in the same

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package ArrayedCollection.
I see that the hierarchy is

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is quite big, so normally
I should find

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somewhere
OrderedCollection, and OrderedCollection is here.

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Now if I select again
OrderedCollection and I

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click again on Inheritance,
I will go back into

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the original package, Sequenceable.

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And we are back to the start.

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What you’ve seen there is 
that Nautilus will

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enable you to browse
the inheritance ignoring

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packages, while showing
in which package you are browsing.