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"Browsing a class"

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Quentin Ducasse.

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-Hi.

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In this video, we are going
to look at the System Browser,

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which is a tool that helps you write
and navigate inside code,

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packages, classes.

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In order to find it, you simply have
to go to your Pharo environment,

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left-click and go to Tools,
then System Browser.

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Just click on that.

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This window will pop up
with four columns.

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The column on the left consists

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of all the packages
that are present in your Pharo image.

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You can see
that there are quite a lot of them.

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If you want to go
inside one of these packages,

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you simply have to click on it.

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For example, let's go inside AST-Core.

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Click on it.

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You can see
that this column is now filled

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and you can see
that those are all the classes

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that are inside this package.

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Now, if we want to go inside a class,
simply click on it

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and you will see that the next
two columns will fill in as well.

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The column on the right
consists of all the methods

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that are in the RBComment class.

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This one consists of protocols.

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Protocols are tags
or groups of methods.

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For example, right here, when we click,

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we will have all the methods of the class

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but if you want to filter
those methods a bit,

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for example display only the ones
that belong to the printing protocol,

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you can click on "printing" and see
that only printOn is filtered out.

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Now, if we want to look
inside the body of a method,

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we can click on it and you will see
that its body will appear here.

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You can really investigate the packages,
classes and methods with this tool.

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Now, another thing to note

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is that you can look
at the class definition here

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and the comments of the class
right there.

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This is a small introduction
to the System Browser tool.

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We will look into it a bit more
in the next videos.