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In this video, I will 
show you one very nice

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facet of Pharo,
its inspector.

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An inspector is a tool
that enables to interact

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with objects, and to discuss 
with them in a lively way.

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Let’s try on the file system.

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For example, if I do “File system

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working directory", I will

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get all the files that are, for 
instance, at my image’s root,

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so we will get all those files.

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Let’s have a look. If I do
“Inspect”,

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I open an inspector.

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Here I have an inspector.

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This is the new Pharo inspector
developed

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by the GT team, it has

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very interesting features.

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Let’s begin to look at the tab

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called “Raw”.

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The “Raw” tab is the old 
inspector. What will

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it show?

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It shows the object data, the
object instance variables

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such as defined in the class.

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I can interact with it.

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I can, for instance,
ask for all the entries.

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Here I get all the entries,
or give me all the

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directories, for instance,
here I get all the directories.

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If we look at the object class,
if I do “self

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browse", what do I see? 

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This view shows me the values

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for the object, the instance
variables that

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have been defined in the class
that way.

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It enables me to look inside.

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For instance, here I can see
that the “Path” is actually

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composed of this object “self”,
and I can see it

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here. I am still in raw mode, 
and

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I can browse inside.

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If I do this, I am actually
going to look at

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the User string and that kind of thing.

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Here I essentially violate 
the encapsulation.

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The system will look at
the introspective behavior,

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it will show me the fields
values.

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This view is very useful.

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But now the new inspector
does more things.

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This means that each object can
show to the user

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different facets of how it
is represented.

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By default, every object 
has the raw facet.

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There is also the Meta facet,
which is

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what enables to browse the class.

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We can browse quickly the class,
for instance, like this.

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Normally, it’s just useful
when you are in the navigation

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flow, when you need to know
directly without opening

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another browser.

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But the most important are
those other tabs.

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Here for example, 

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the inspector knowing that 
we have a reference,

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a directory, shows everything
contained in the directory.

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It is what I showed you there
when I did this.

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Here, we get the same thing.

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Now, we can browse inside

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this file system.

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If I choose Ston, this is an equivalent
of Json in Pharo,

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once more I get a

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reference inside the file
system, which is

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this file here,
I get an access on

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the file called 

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meta-inf.ston. And now the
inspector is 

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smart and tells me “I will
show you its content if you want.”

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I look at its content and 
it appears I have 

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a content, I don’t know exactly
what it is for, but it is a content.

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In the same way, I can 
browse the sub-folders.

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Here, if I choose 
package-cash, this is the place where

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packages are stored by default.

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Indeed, this is still an object 
of the file system

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but it shows me its content.

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If I look into Data, I can see

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one png. If I click on 
this png, I will browse.

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Here, you see there are other tabs.

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If I click on Content,

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the png as stored in a binary
format on my disk.

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As it is a png, 
the inspector shows me a preview

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of what the png contains.

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If I look at the script.st,

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for example, I will have
different panes.

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Here there are two, I don’t 
know exactly why

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but there is one with
syntax highlighting and the other

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one without, showing the
content once more. 

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If it is a .zip file, it
is even better because when I

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on it, the zip content is
encoded and 

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compressed but the items,
at this point, are

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interpreted. Here I can 
browse directly 

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my objects and in the same
way recursively.

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That was to show you that the 
Pharo inspector 

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is really a very powerful tool
for interacting 

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precisely with objects, 
moreover as each object

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determines a representation
or a set of

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meaningful representations
for us to

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interact with it and to be 
the most efficient, 

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this enables to build very quickly
little tools.

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Here you have a small file systems
browser, why?

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Because when you browse and
inspect 

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the file system, sometimes you
want to know

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exactly what you are inspecting.