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In this video, I will 
present a cool tool

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which help you to learn
Pharo by yourself

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It is ProfStef.

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How to launch ProfStef?

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You type "ProfStef Go", select it,

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then "Do it", and you are in ProfStef.

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So, ProfStef is a small
tool written in Pharo.

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What is interesting is that
it only uses Pharo syntax.

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All you will see,
all you will manipulate,

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are Pharo expressions.

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For example, here, you have
a Pharo comment

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that explains to do "Hello"

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then, "Select the text",

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use right-click and 
choose "do it".

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We will do it using 
keyboard shortcuts.

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Et voilà, I moved to 
the second lesson.

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Now you understood the principle,

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some comments, and now some 
expressions to execute.

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If I do "Do it',
it opens a workspace and 

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I can type text inside, I close it.

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This expression opens

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a window that displays 
the system version I am using

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to record this video.

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And to go to next lesson: 
I select the expression, or not,

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I can just put the caret 
on the line, "Do it", and  

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I go to the next lesson. 
This new lesson,

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tells you that you were able
to achieve "Do it"

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Now, I will do "Print".

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Same as before, you have results
and you will see and interact.

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So here, for example,
What is the current date?

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March, 5th.

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Voilà, you have seen all you need

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to achieve to ProfStef lessons
by yourself.

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And you will see that it is fun ;-)

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I would like to thank
Laurent Lafont who is

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the author of ProfStef because
it is a really cool tool.

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So, we will do 
"ProfStef says: #Thanks to:

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#Laurent". Thanks again.

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Obviously, this 
expression cannot be executed

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directly, so let's go to
the next lesson.