[squeakland] What is a parameter in etoys?

[Ricardo Moran]

Ok, I'll do it tonight :)

On Mon, Mar 28, 2011 at 1:51 PM, Bert Freudenberg <bert at freudenbergs.de>wrote:

>
> On 28.03.2011, at 15:58, Ricardo Moran wrote:
>
> Great explanation! I didn't know the difference between "arguments" and
> "parameters" :)
>
>
>
> http://en.wikipedia.org/wiki/Parameter_(computer_programming)#Parameters_and_arguments
>
> BTW, is this written somewhere? It would be cool to add it to the manual...
>
>
> Go ahead and add it :)
>
> - Bert -
>
>
> On Mon, Mar 28, 2011 at 10:02 AM, Bert Freudenberg <bert at freudenbergs.de>wrote:
>
>> On 28.03.2011, at 14:17, Christine Murakami wrote:
>>
>> Do you have some documentation on how parameters work in Etoys and what
>> they can accomplish? I looked it up in your Floss manual but it was unclear
>> to me where to find that information.
>>
>>
>> Many tiles in Etoys have a parameter. It is a value that influences the
>> behavior of that tile.
>>
>> For example, the "forward by" tile has a parameter that specifies how far
>> the object should move. The "make sound" parameter specifies which sound to
>> make. Etc.
>>
>> You can also make your own tiles. When you create a new script, a tile for
>> it is placed in an object's "scripts" viewer category. That tile can be used
>> in another script.
>>
>> The "add parameter" menu entry lets you add a parameter to your own tile.
>> If you use that new tile in another script, you can set a specific value for
>> the parameter just like with any other tile.
>>
>> Inside the script for your tile, that parameter is shown in the title bar.
>> It is called "number" (unless you change the parameter type). You drag this
>> "number" tile and use it like any variable tile in that script.
>>
>> E.g. in this script, I used the "number" tile four times:
>>
>> <PastedGraphic-1.png>
>>
>> Every time you use your new tile, you can give it another "concrete"
>> value. That's why in the script itself, you only have the "abstract" value
>> called "number". (Computer scientists call the concrete values "arguments"
>> and the abstract values "parameters", but even programmers get confused
>> about the distinction)
>>
>> <PastedGraphic-3.png>
>>
>> Note that after adding a parameter, you can not set your script to
>> "ticking" anymore, because it now needs a parameter. It only gets a concrete
>> value for the parameter from another script where your tile is used.
>> Additionally, you can set a value in the viewer, and hit the yellow button
>> to run your script with that value:
>>
>> <PastedGraphic-6.png>
>>
>> - Bert -
>>
>>
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>>
>
>
>
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