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"Redo: Better printing with printOn:"

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Quentin Ducasse.

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-Hello, everyone.

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In part 6 of the redo,

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we will see how to change the output
the "Print it" command gave us.

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For now, we will look
at the Counter object we created,

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if we remove the "increment"
and print everything.

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So, double-click, right-click, Print it
or we can simply press Cmd+P.

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We can see that it is a counter

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but we do not have much info
on the value it holds

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and this might be valuable.

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In order to change that,

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we have to take a look
at the printOn method.

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Let's go there and write the "printOn:"

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so it takes "aStream" as an argument
and...

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We want to keep the Counter
we had before.

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So, this is a Counter.

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But we want to add value.

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We have to do : "aStream nextPutAll:".

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And we have to add "withValue"

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and in order to concatenate two strings,
we will use the comma

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and then write "count"

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and convert for count
to a string with "printString".

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This is a counter,

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this is "withValue",

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and this will add the actual value
of "count" to a string.

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And now,

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we will add a carriage return.

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Let's save all this

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and see how it works now.

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We should have a Counter
with value 0, right?

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Let's print it.

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"Counter withValue 0". That is great.

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Now, if we change this,
and make it start at 23,

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and print this,

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"Counter withValue 23".
So, that is cool.

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That is working as expected and it is
a good time to commit what we changed.

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Let's go to Commit,

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say: "printOn method corrected

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(with value)".

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And let's commit everything.

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So, in this part,

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we learned how to change the output
we can get with a "Print it" command

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on an object we have defined.