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Roelof

lasergame question

Hello,

Im on this page now: http://squeak.preeminent.org/tut2007/html/017.html

I do not understand one thing.

Where do I put the initialize "script"

When I put it on the initializeActiveSegments then initialize get not found.

Or must I make a seperate protocol named ActiveSegments for it.
If I made a initialize on the initiialize protocol. ActiveSegments stays
nill.

Roelof

Nicolai Hess

Re: lasergame question

Hi Roelof

2014-04-01 14:52 GMT+02:00 Roelof Wobben <[hidden email]>:

Hello,

Im on this page now: http://squeak.preeminent.org/tut2007/html/017.html

I do not understand one thing.

Where do I put the initialize "script"

What do you mean with "script", the method?

When I put it on the initializeActiveSegments then initialize get not found.

Or must I make a seperate protocol named ActiveSegments for it.

The protocols are only used for grouping/organizing methods, it does not make
a difference on how the methods are found or executed.

In that tutorial, both methods are in the protocol initialize-release.

If I made a initialize on the initiialize protocol. ActiveSegments stays nill.

Roelof

the initialize method is called "automatically" for every Object/Cell when
it is created with "new"

"Cell new" -> creates a new Cell and calls initialize.

camille teruel

Re: lasergame question

In reply to this post by Roelof

On 1 avr. 2014, at 14:52, Roelof Wobben <[hidden email]> wrote:

> Hello,

Hello,

> Im on this page now: http://squeak.preeminent.org/tut2007/html/017.html
>
> I do not understand one thing.
>
> Where do I put the initialize "script"

#initialize is not a script, it's a method. When an object is instantiated (for ex with: MyObject new) #initialize is automatically sent to it.
This is the place to put your newly created object in a correct initial state.
In your class, you just define a protocol named for example "initialization" where you put all the initialization-related methods.
Note that protocols have no meaning, i.e. they don't change how your objects behave, they're just here to help you classify
the methods of a class by concerns.
So the tutorial tell you to create two methods: #initialize that is automatically called after an object has been instantiated and #initializeActiveSegments where you
put some other initialization logic, that's all.

> When I put it on the initializeActiveSegments then initialize get not found.

Sorry, I don't understand.

> Or must I make a seperate protocol named ActiveSegments for it.

No use the same protocol "initialization" or "initialize-release" or whatever.

> If I made a initialize on the initiialize protocol. ActiveSegments stays nill.
>
> Roelof
>
>

Roelof

Re: lasergame question

Camille Teruel schreef op 1-4-2014 15:08:

> On 1 avr. 2014, at 14:52, Roelof Wobben <[hidden email]> wrote:
>
>> Hello,
> Hello,
>
>> Im on this page now: http://squeak.preeminent.org/tut2007/html/017.html
>>
>> I do not understand one thing.
>>
>> Where do I put the initialize "script"
> #initialize is not a script, it's a method. When an object is instantiated (for ex with: MyObject new) #initialize is automatically sent to it.
> This is the place to put your newly created object in a correct initial state.
> In your class, you just define a protocol named for example "initialization" where you put all the initialization-related methods.
> Note that protocols have no meaning, i.e. they don't change how your objects behave, they're just here to help you classify
> the methods of a class by concerns.
> So the tutorial tell you to create two methods: #initialize that is automatically called after an object has been instantiated and #initializeActiveSegments where you
> put some other initialization logic, that's all.
>
>> When I put it on the initializeActiveSegments then initialize get not found.
> Sorry, I don't understand.
>
>> Or must I make a seperate protocol named ActiveSegments for it.
> No use the same protocol "initialization" or "initialize-release" or whatever.
>

Oke,

I changed it so I have this :

Laser-Game-Model
with as classes:
- BlankCell
- Grid
- MirrorCell
-TargetCell

BlankCell has the following protocols:
- initializing-release
- testing

Initializing - release contains the following methods:
- initialize
- initializeActiveSegments

testing contains the following methods:
isOn
isOff

but when I run the test-runner I see this : MessageNotUnderstood :
BlankCell >> activeSegments.

Roelof

camille teruel

Re: lasergame question

On 1 avr. 2014, at 16:21, Roelof Wobben <[hidden email]> wrote:

Camille Teruel schreef op 1-4-2014 15:08:
On 1 avr. 2014, at 14:52, Roelof Wobben <[hidden email]> wrote:

Hello,
Hello,

Im on this page now: http://squeak.preeminent.org/tut2007/html/017.html

I do not understand one thing.

Where do I put the initialize "script"
#initialize is not a script, it's a method. When an object is instantiated (for ex with: MyObject new) #initialize is automatically sent to it.
This is the place to put your newly created object in a correct initial state.
In your class, you just define a protocol named for example "initialization" where you put all the initialization-related methods.
Note that protocols have no meaning, i.e. they don't change how your objects behave, they're just here to help you classify
the methods of a class by concerns.
So the tutorial tell you to create two methods: #initialize that is automatically called after an object has been instantiated and #initializeActiveSegments where you
put some other initialization logic, that's all.

When I put it on the initializeActiveSegments then initialize get not found.
Sorry, I don't understand.

Or must I make a seperate protocol named ActiveSegments for it.
No use the same protocol "initialization" or "initialize-release" or whatever.

Oke,

I changed it so I have this :

Laser-Game-Model
with as classes:
- BlankCell
- Grid
- MirrorCell
-TargetCell

BlankCell has the following protocols:
- initializing-release
- testing

Initializing - release contains the following methods:
- initialize
- initializeActiveSegments

testing contains the following methods:
isOn
isOff

but when I run the test-runner I see this : MessageNotUnderstood : BlankCell >> activeSegments.

This error means "instances of BlankCell does not understand the message #activeSegments" that's all, this part of your program is not implemented yet.

Roelof

Roelof

Re: lasergame question

Camille Teruel schreef op 1-4-2014 16:34:

On 1 avr. 2014, at 16:21, Roelof Wobben <[hidden email]> wrote:

Camille Teruel schreef op 1-4-2014 15:08:

On 1 avr. 2014, at 14:52, Roelof Wobben <[hidden email]> wrote:

Hello,

Hello,

Im on this page now: http://squeak.preeminent.org/tut2007/html/017.html

I do not understand one thing.

Where do I put the initialize "script"

#initialize is not a script, it's a method. When an object is instantiated (for ex with: MyObject new) #initialize is automatically sent to it.
This is the place to put your newly created object in a correct initial state.
In your class, you just define a protocol named for example "initialization" where you put all the initialization-related methods.
Note that protocols have no meaning, i.e. they don't change how your objects behave, they're just here to help you classify
the methods of a class by concerns.
So the tutorial tell you to create two methods: #initialize that is automatically called after an object has been instantiated and #initializeActiveSegments where you
put some other initialization logic, that's all.

When I put it on the initializeActiveSegments then initialize get not found.

Sorry, I don't understand.

Or must I make a seperate protocol named ActiveSegments for it.

No use the same protocol "initialization" or "initialize-release" or whatever.

Oke,

I changed it so I have this :

Laser-Game-Model
with as classes:
- BlankCell
- Grid
- MirrorCell
-TargetCell

BlankCell has the following protocols:
- initializing-release
- testing

Initializing - release contains the following methods:
- initialize
- initializeActiveSegments

testing contains the following methods:
isOn
isOff

but when I run the test-runner I see this : MessageNotUnderstood : BlankCell >> activeSegments.

This error means "instances of BlankCell does not understand the message #activeSegments" that's all, this part of your program is not implemented yet.

Im not agree with you according to the tutorial on this page : http://squeak.preeminent.org/tut2007/html/019.html there is a error with isOn and isOff. #activeSegments schould be implemented by now.

Roelof

Nicolai Hess

Re: lasergame question

In reply to this post by Roelof

2014-04-01 16:21 GMT+02:00 Roelof Wobben <[hidden email]>:

Camille Teruel schreef op 1-4-2014 15:08:

On 1 avr. 2014, at 14:52, Roelof Wobben <[hidden email]> wrote:

Hello,

Hello,

Im on this page now: http://squeak.preeminent.org/tut2007/html/017.html

I do not understand one thing.

Where do I put the initialize "script"

#initialize is not a script, it's a method. When an object is instantiated (for ex with: MyObject new) #initialize is automatically sent to it.
This is the place to put your newly created object in a correct initial state.
In your class, you just define a protocol named for example "initialization" where you put all the initialization-related methods.
Note that protocols have no meaning, i.e. they don't change how your objects behave, they're just here to help you classify
the methods of a class by concerns.
So the tutorial tell you to create two methods: #initialize that is automatically called after an object has been instantiated and #initializeActiveSegments where you
put some other initialization logic, that's all.

When I put it on the initializeActiveSegments then initialize get not found.

Sorry, I don't understand.

Or must I make a seperate protocol named ActiveSegments for it.

No use the same protocol "initialization" or "initialize-release" or whatever.

Oke,

I changed it so I have this :

Laser-Game-Model
with as classes:
- BlankCell
- Grid
- MirrorCell
-TargetCell

BlankCell has the following protocols:
- initializing-release
- testing

Initializing - release contains the following methods:
- initialize
- initializeActiveSegments

testing contains the following methods:
isOn
isOff

but when I run the test-runner I see this : MessageNotUnderstood : BlankCell >> activeSegments.

Roelof

Then you missed the last step on http://squeak.preeminent.org/tut2007/html/016.html
Select "create instance var accessors" from the second popup menu.

Roelof

Re: lasergame question

Nicolai Hess schreef op 1-4-2014 16:44:

2014-04-01 16:21 GMT+02:00 Roelof Wobben <[hidden email]>:

Camille Teruel schreef op 1-4-2014 15:08:

On 1 avr. 2014, at 14:52, Roelof Wobben <[hidden email]> wrote:

Hello,

Hello,

Im on this page now: http://squeak.preeminent.org/tut2007/html/017.html

I do not understand one thing.

Where do I put the initialize "script"

#initialize is not a script, it's a method. When an object is instantiated (for ex with: MyObject new) #initialize is automatically sent to it.
This is the place to put your newly created object in a correct initial state.
In your class, you just define a protocol named for example "initialization" where you put all the initialization-related methods.
Note that protocols have no meaning, i.e. they don't change how your objects behave, they're just here to help you classify
the methods of a class by concerns.
So the tutorial tell you to create two methods: #initialize that is automatically called after an object has been instantiated and #initializeActiveSegments where you
put some other initialization logic, that's all.

When I put it on the initializeActiveSegments then initialize get not found.

Sorry, I don't understand.

Or must I make a seperate protocol named ActiveSegments for it.

No use the same protocol "initialization" or "initialize-release" or whatever.

Oke,

I changed it so I have this :

Laser-Game-Model
with as classes:
- BlankCell
- Grid
- MirrorCell
-TargetCell

BlankCell has the following protocols:
- initializing-release
- testing

Initializing - release contains the following methods:
- initialize
- initializeActiveSegments

testing contains the following methods:
isOn
isOff

but when I run the test-runner I see this : MessageNotUnderstood : BlankCell >> activeSegments.

Roelof

Then you missed the last step on http://squeak.preeminent.org/tut2007/html/016.html
Select "create instance var accessors" from the second popup menu.

I also did.
See this :

Object subclass: #BlankCell
    instanceVariableNames: 'activeSegments'
    classVariableNames: ''
    category: 'Laser-Game-Model'

Roelof

camille teruel

Re: lasergame question

In reply to this post by Roelof

On 1 avr. 2014, at 16:39, Roelof Wobben <[hidden email]> wrote:

Camille Teruel schreef op 1-4-2014 16:34:

On 1 avr. 2014, at 16:21, Roelof Wobben <[hidden email]> wrote:

Camille Teruel schreef op 1-4-2014 15:08:
On 1 avr. 2014, at 14:52, Roelof Wobben <[hidden email]> wrote:

Hello,
Hello,

Im on this page now: http://squeak.preeminent.org/tut2007/html/017.html

I do not understand one thing.

Where do I put the initialize "script"
#initialize is not a script, it's a method. When an object is instantiated (for ex with: MyObject new) #initialize is automatically sent to it.
This is the place to put your newly created object in a correct initial state.
In your class, you just define a protocol named for example "initialization" where you put all the initialization-related methods.
Note that protocols have no meaning, i.e. they don't change how your objects behave, they're just here to help you classify
the methods of a class by concerns.
So the tutorial tell you to create two methods: #initialize that is automatically called after an object has been instantiated and #initializeActiveSegments where you
put some other initialization logic, that's all.

When I put it on the initializeActiveSegments then initialize get not found.
Sorry, I don't understand.

Or must I make a seperate protocol named ActiveSegments for it.
No use the same protocol "initialization" or "initialize-release" or whatever.

Oke,

I changed it so I have this :

Laser-Game-Model
with as classes:
- BlankCell
- Grid
- MirrorCell
-TargetCell

BlankCell has the following protocols:
- initializing-release
- testing

Initializing - release contains the following methods:
- initialize
- initializeActiveSegments

testing contains the following methods:
isOn
isOff

but when I run the test-runner I see this : MessageNotUnderstood : BlankCell >> activeSegments.

This error means "instances of BlankCell does not understand the message #activeSegments" that's all, this part of your program is not implemented yet.

Im not agree with you according to the tutorial on this page : http://squeak.preeminent.org/tut2007/html/019.html there is a error with isOn and isOff.

There is no way to be agree or not with that, MessageNotUnderstood is an error thrown when a message is ..., well, ... not understood.

So no method named activeSegments is defined in BlankCell hierarchy, it's as simple as that.

#activeSegments schould be implemented by now.

Well according to the DNU error, it is not. So I guess you missed some step in the tutorial.

Roelof

Ben Coman

Re: lasergame question

In reply to this post by Roelof

Roelof Wobben wrote:

> Camille Teruel schreef op 1-4-2014 15:08:
>> On 1 avr. 2014, at 14:52, Roelof Wobben <[hidden email]> wrote:
>>
>>> Hello,
>> Hello,
>>
>>> Im on this page now: http://squeak.preeminent.org/tut2007/html/017.html
>>>
>>> I do not understand one thing.
>>>
>>> Where do I put the initialize "script"
>> #initialize is not a script, it's a method. When an object is
>> instantiated (for ex with: MyObject new) #initialize is automatically
>> sent to it.
>> This is the place to put your newly created object in a correct
>> initial state.
>> In your class, you just define a protocol named for example
>> "initialization" where you put all the initialization-related methods.
>> Note that protocols have no meaning, i.e. they don't change how your
>> objects behave, they're just here to help you classify
>> the methods of a class by concerns.
>> So the tutorial tell you to create two methods: #initialize that is
>> automatically called after an object has been instantiated and
>> #initializeActiveSegments where you
>> put some other initialization logic, that's all.
>>
>>> When I put it on the initializeActiveSegments then initialize get
>>> not found.
>> Sorry, I don't understand.
>>
>>> Or must I make a seperate protocol named ActiveSegments for it.
>> No use the same protocol "initialization" or "initialize-release" or
>> whatever.
>>
>
> Oke,
>
> I changed it so I have this :
>
> Laser-Game-Model
> with as classes:
> - BlankCell
> - Grid
> - MirrorCell
> -TargetCell
>
>
> BlankCell has the following protocols:
> - initializing-release
> - testing
>
> Initializing - release contains the following methods:
> - initialize
> - initializeActiveSegments
>
> testing contains the following methods:
> isOn
> isOff
>
> but when I run the test-runner I see this : MessageNotUnderstood :
> BlankCell >> activeSegments.
>
> Roelof

Now first as an aside, I'll just mention something that caught me out
when I went through this tutorial when I was quite new to Smalltalk,
which is paying attention to whether you are defining methods on the
instance-side or the class-side, as indicated by which of the <instance>
or <class> button is highlighted.

Now for BlankCell, if you select protocol --all--
do you see a method #activeSegments ?
The lack of that method is the cause of the MessageNotUnderstood.

Looking at the previous page it says "Add an instance variable
"activeSegments"
and "We will use Squeak's built-in tools to create accessors for this
new instance variable"
I would say something went wrong there. Consider the last snapshot of
page 16.

cheers -ben

camille teruel

Re: lasergame question

In reply to this post by Roelof

On 1 avr. 2014, at 16:50, Roelof Wobben <[hidden email]> wrote:

Nicolai Hess schreef op 1-4-2014 16:44:

2014-04-01 16:21 GMT+02:00 Roelof Wobben <[hidden email]>:

Camille Teruel schreef op 1-4-2014 15:08:

On 1 avr. 2014, at 14:52, Roelof Wobben <[hidden email]> wrote:

Hello,

Hello,

Im on this page now: http://squeak.preeminent.org/tut2007/html/017.html

I do not understand one thing.

Where do I put the initialize "script"

#initialize is not a script, it's a method. When an object is instantiated (for ex with: MyObject new) #initialize is automatically sent to it.
This is the place to put your newly created object in a correct initial state.
In your class, you just define a protocol named for example "initialization" where you put all the initialization-related methods.
Note that protocols have no meaning, i.e. they don't change how your objects behave, they're just here to help you classify
the methods of a class by concerns.
So the tutorial tell you to create two methods: #initialize that is automatically called after an object has been instantiated and #initializeActiveSegments where you
put some other initialization logic, that's all.

When I put it on the initializeActiveSegments then initialize get not found.

Sorry, I don't understand.

Or must I make a seperate protocol named ActiveSegments for it.

No use the same protocol "initialization" or "initialize-release" or whatever.

Oke,

I changed it so I have this :

Laser-Game-Model
with as classes:
- BlankCell
- Grid
- MirrorCell
-TargetCell

BlankCell has the following protocols:
- initializing-release
- testing

Initializing - release contains the following methods:
- initialize
- initializeActiveSegments

testing contains the following methods:
isOn
isOff

but when I run the test-runner I see this : MessageNotUnderstood : BlankCell >> activeSegments.

Roelof

Then you missed the last step on http://squeak.preeminent.org/tut2007/html/016.html
Select "create instance var accessors" from the second popup menu.

I also did.
See this :

Object subclass: #BlankCell
    instanceVariableNames: 'activeSegments'
    classVariableNames: ''
    category: 'Laser-Game-Model'

This message just serve as a class definition, it basically says "I want a class named BlankCell, subclass of Object, with one instance variable named activeSegments, in the category Laser-Game-Model".

But, it says nothing about BlankCell methods.

So as Nicolai pointed out, you forgot to do the last step of page 16. It will create two methods for accessing the instance variable activeSegments:

First an accessor method:

BlankCell>>activeSegments

^ activeSegments

And a mutator (you should rename the argument to better convey the intent)

BlankCell>>activeSegments: anObject

activeSegments := anObject

Roelof

Ben Coman

Re: lasergame question

In reply to this post by Roelof

Roelof Wobben wrote:

Nicolai Hess schreef op 1-4-2014 16:44:

2014-04-01 16:21 GMT+02:00 Roelof Wobben <[hidden email]>:

Camille Teruel schreef op 1-4-2014 15:08:

On 1 avr. 2014, at 14:52, Roelof Wobben <[hidden email]> wrote:

Hello,

Hello,

Im on this page now: http://squeak.preeminent.org/tut2007/html/017.html

I do not understand one thing.

Where do I put the initialize "script"

#initialize is not a script, it's a method. When an object is instantiated (for ex with: MyObject new) #initialize is automatically sent to it.
This is the place to put your newly created object in a correct initial state.
In your class, you just define a protocol named for example "initialization" where you put all the initialization-related methods.
Note that protocols have no meaning, i.e. they don't change how your objects behave, they're just here to help you classify
the methods of a class by concerns.
So the tutorial tell you to create two methods: #initialize that is automatically called after an object has been instantiated and #initializeActiveSegments where you
put some other initialization logic, that's all.

When I put it on the initializeActiveSegments then initialize get not found.

Sorry, I don't understand.

Or must I make a seperate protocol named ActiveSegments for it.

No use the same protocol "initialization" or "initialize-release" or whatever.

Oke,

I changed it so I have this :

Laser-Game-Model
with as classes:
- BlankCell
- Grid
- MirrorCell
-TargetCell

BlankCell has the following protocols:
- initializing-release
- testing

Initializing - release contains the following methods:
- initialize
- initializeActiveSegments

testing contains the following methods:
isOn
isOff

but when I run the test-runner I see this : MessageNotUnderstood : BlankCell >> activeSegments.

Roelof

Then you missed the last step on http://squeak.preeminent.org/tut2007/html/016.html
Select "create instance var accessors" from the second popup menu.

I also did.
See this :

Object subclass: #BlankCell
    instanceVariableNames: 'activeSegments'
    classVariableNames: ''
    category: 'Laser-Game-Model'

Roelof

This only creates the instance variable. I'm not clear whether are saying you performed the step shown in the second last snapshot on page 16 or not - but the evidence of the MNU would seem it didn't happen. Now I'm going to extrapolate a lot a check whether you are thinking of 'activeSegments' in #initializeActiveSegments as a reference to the instance variable. However it is not a reference to the variable (even if the name is the same) but actually a send of the #activeSegments message to 'self'. Doing it like this rather than accessing the variable directly has the advantage of focusing access to the variable through a single point, which helps observability of variable access. Also, in a "live" environment like Smalltalk, when you have instances of class X in a running system, and you add an instance variable to X, all existing classes contain 'nil' for that added variable and _everywhere_ you directly access that variable in your code would need to be wrapped in a conditional.message like #ifNil:

cheers -ben

Ben Coman

Re: lasergame question

In reply to this post by camille teruel

Camille Teruel wrote:

On 1 avr. 2014, at 16:50, Roelof Wobben <[hidden email]> wrote:

Nicolai Hess schreef op 1-4-2014 16:44:

2014-04-01 16:21 GMT+02:00 Roelof Wobben <[hidden email]>:

Camille Teruel schreef op 1-4-2014 15:08:

On 1 avr. 2014, at 14:52, Roelof Wobben <[hidden email]> wrote:

Hello,

Hello,

Im on this page now: http://squeak.preeminent.org/tut2007/html/017.html

I do not understand one thing.

Where do I put the initialize "script"

#initialize is not a script, it's a method. When an object is instantiated (for ex with: MyObject new) #initialize is automatically sent to it.
This is the place to put your newly created object in a correct initial state.
In your class, you just define a protocol named for example "initialization" where you put all the initialization-related methods.
Note that protocols have no meaning, i.e. they don't change how your objects behave, they're just here to help you classify
the methods of a class by concerns.
So the tutorial tell you to create two methods: #initialize that is automatically called after an object has been instantiated and #initializeActiveSegments where you
put some other initialization logic, that's all.

When I put it on the initializeActiveSegments then initialize get not found.

Sorry, I don't understand.

Or must I make a seperate protocol named ActiveSegments for it.

No use the same protocol "initialization" or "initialize-release" or whatever.

Oke,

I changed it so I have this :

Laser-Game-Model
with as classes:
- BlankCell
- Grid
- MirrorCell
-TargetCell

BlankCell has the following protocols:
- initializing-release
- testing

Initializing - release contains the following methods:
- initialize
- initializeActiveSegments

testing contains the following methods:
isOn
isOff

but when I run the test-runner I see this : MessageNotUnderstood : BlankCell >> activeSegments.

Roelof

Then you missed the last step on http://squeak.preeminent.org/tut2007/html/016.html
Select "create instance var accessors" from the second popup menu.

I also did.
See this :

Object subclass: #BlankCell
    instanceVariableNames: 'activeSegments'
    classVariableNames: ''
    category: 'Laser-Game-Model'

This message just serve as a class definition, it basically says "I want a class named BlankCell, subclass of Object, with one instance variable named activeSegments, in the category Laser-Game-Model".

But, it says nothing about BlankCell methods.

So as Nicolai pointed out, you forgot to do the last step of page 16. It will create two methods for accessing the instance variable activeSegments:

First an accessor method:

BlankCell>>activeSegments

^ activeSegments

And a mutator (you should rename the argument to better convey the intent)

BlankCell>>activeSegments: anObject

activeSegments := anObject

Roelof

>And a mutator (you should rename the argument to better convey the intent)
In general maybe, but not for the tutorial.
cheers -ben

Roelof

Re: lasergame question

Ben Coman schreef op 1-4-2014 17:13:

Camille Teruel wrote:

On 1 avr. 2014, at 16:50, Roelof Wobben <[hidden email]> wrote:

Nicolai Hess schreef op 1-4-2014 16:44:

2014-04-01 16:21 GMT+02:00 Roelof Wobben <[hidden email]>:

Camille Teruel schreef op 1-4-2014 15:08:

On 1 avr. 2014, at 14:52, Roelof Wobben <[hidden email]> wrote:

Hello,

Hello,

Im on this page now: http://squeak.preeminent.org/tut2007/html/017.html

I do not understand one thing.

Where do I put the initialize "script"

#initialize is not a script, it's a method. When an object is instantiated (for ex with: MyObject new) #initialize is automatically sent to it.
This is the place to put your newly created object in a correct initial state.
In your class, you just define a protocol named for example "initialization" where you put all the initialization-related methods.
Note that protocols have no meaning, i.e. they don't change how your objects behave, they're just here to help you classify
the methods of a class by concerns.
So the tutorial tell you to create two methods: #initialize that is automatically called after an object has been instantiated and #initializeActiveSegments where you
put some other initialization logic, that's all.

When I put it on the initializeActiveSegments then initialize get not found.

Sorry, I don't understand.

Or must I make a seperate protocol named ActiveSegments for it.

No use the same protocol "initialization" or "initialize-release" or whatever.

Oke,

I changed it so I have this :

Laser-Game-Model
with as classes:
- BlankCell
- Grid
- MirrorCell
-TargetCell

BlankCell has the following protocols:
- initializing-release
- testing

Initializing - release contains the following methods:
- initialize
- initializeActiveSegments

testing contains the following methods:
isOn
isOff

but when I run the test-runner I see this : MessageNotUnderstood : BlankCell >> activeSegments.

Roelof

Then you missed the last step on http://squeak.preeminent.org/tut2007/html/016.html
Select "create instance var accessors" from the second popup menu.

I also did.
See this :

Object subclass: #BlankCell
    instanceVariableNames: 'activeSegments'
    classVariableNames: ''
    category: 'Laser-Game-Model'

This message just serve as a class definition, it basically says "I want a class named BlankCell, subclass of Object, with one instance variable named activeSegments, in the category Laser-Game-Model".

But, it says nothing about BlankCell methods.

So as Nicolai pointed out, you forgot to do the last step of page 16. It will create two methods for accessing the instance variable activeSegments:

First an accessor method:

BlankCell>>activeSegments

^ activeSegments

And a mutator (you should rename the argument to better convey the intent)

BlankCell>>activeSegments: anObject

activeSegments := anObject

Roelof

>And a mutator (you should rename the argument to better convey the intent)
In general maybe, but not for the tutorial.
cheers -ben

Oke,

I see what went wrong. I did try to make this work on Pharo and appereantly it worked otherwise.
I will download squezee 3.9 and try again.

Roelof

Mark Rizun

Re: lasergame question

Hello, Roelof!

Stef is partly right. I had implemented Laser Game but on Squeak, not Pharo.

If you have any questions, ask me and I will try to help you.

Mark

Roelof

Re: lasergame question

Mark Rizun schreef op 1-4-2014 18:12:
> Hello, Roelof!
>
> Stef is partly right. I had implemented Laser Game but on Squeak, not
> Pharo.
> If you have any questions, ask me and I will try to help you.
>
> Mark

First question :

I had a working test. I saved it to my hard disk.
Closed Pharo . re open it and the test is failing.

Roelof

Ben Coman

Re: lasergame question

Roelof Wobben wrote:

> Mark Rizun schreef op 1-4-2014 18:12:
>> Hello, Roelof!
>>
>> Stef is partly right. I had implemented Laser Game but on Squeak, not
>> Pharo.
>> If you have any questions, ask me and I will try to help you.
>>
>> Mark
>
> First question :
>
> I had a working test. I saved it to my hard disk.
> Closed Pharo . re open it and the test is failing.
>
> Roelof
>
>
>

That is a very generic statement, and my very generic answer is that
I've never observed that happening. You would need to present more
specific context for your problem.
* What is the error
* What is the method source and line that it is failing on
* What are the values of the instance variables

This is generally described in the following article.
http://www.catb.org/esr/faqs/smart-questions.html

cheers -ben