Greetings,
I have a OrderedCollection of DrivingDays.
an OrderedCollection(2016-01-02| quigley s| nil|18§ 2016-01-03| marianos fresh| nil|5§ 2016-01-04| fresh thyme| nil|5§ 2016-01-05| panda express| nil|3§ 2016-01-06| peets| nil|7§ 2016-01-07| starbucks| nil|3§)
I want to select aDrivingDay object from the list by date, update it by adding mileage and places visited and put it back into the list.
If I #select the OrderedCollection, I get a copy of the item, not the same one in the OrderedCollection.
How do I select an item in the list for update?
Sincerely,
Joe.
Hi Joe,
If the orderedCollection contains your object DrivingDays then select should give you the object and not a copy.
You don't need to add it back to the collection just update the object.
Check your code for anything that might be making a copy.
All the best,
Ron Teitelbaum
-----Original Message----- From: beginners-bounces@lists.squeakfoundation.org [mailto:beginners-bounces@lists.squeakfoundation.org] On Behalf Of Joseph Alotta Sent: Tuesday, July 26, 2016 3:04 PM To: beginners@lists.squeakfoundation.org Subject: [Newbies] indexing into a collection
Greetings,
I have a OrderedCollection of DrivingDays.
an OrderedCollection(2016-01-02| quigley s| nil|18§ 2016-01-03| marianos fresh| nil|5§ 2016-01-04| fresh thyme| nil|5§ 2016-01-05| panda express| nil|3§ 2016-01-06| peets| nil|7§ 2016-01-07| starbucks| nil|3§)
I want to select aDrivingDay object from the list by date, update it by adding mileage and places visited and put it back into the list.
If I #select the OrderedCollection, I get a copy of the item, not the same one in the OrderedCollection.
How do I select an item in the list for update?
Sincerely,
Joe.
_______________________________________________ Beginners mailing list Beginners@lists.squeakfoundation.org http://lists.squeakfoundation.org/mailman/listinfo/beginners
Hi Joe,
As Ron said, you should not be getting a copy. If you still have a problem, perhaps best if you post code for a complete example: * class definition (with just two instance variables) * instance variable accessor methods * instance creation & adding to collection * select statement * updating object
cheers -ben
On Wed, Jul 27, 2016 at 5:53 AM, Ron Teitelbaum ron@usmedrec.com wrote:
Hi Joe,
If the orderedCollection contains your object DrivingDays then select should give you the object and not a copy.
You don't need to add it back to the collection just update the object.
Check your code for anything that might be making a copy.
All the best,
Ron Teitelbaum
-----Original Message----- From: beginners-bounces@lists.squeakfoundation.org [mailto:beginners-bounces@lists.squeakfoundation.org] On Behalf Of Joseph Alotta Sent: Tuesday, July 26, 2016 3:04 PM To: beginners@lists.squeakfoundation.org Subject: [Newbies] indexing into a collection
Greetings,
I have a OrderedCollection of DrivingDays.
an OrderedCollection(2016-01-02| quigley s| nil|18§ 2016-01-03| marianos fresh| nil|5§ 2016-01-04| fresh thyme| nil|5§ 2016-01-05| panda express| nil|3§ 2016-01-06| peets| nil|7§ 2016-01-07| starbucks| nil|3§)
I want to select aDrivingDay object from the list by date, update it by adding mileage and places visited and put it back into the list.
If I #select the OrderedCollection, I get a copy of the item, not the same one in the OrderedCollection.
How do I select an item in the list for update?
Sincerely,
Joe.
Ben, Ron, I made a small example, and it works as you said it would:
a := #( #(1 2) #(3 4)). b := a asOrderedCollection. b => an OrderedCollection(#(1 2) #(3 4)) c := b select: [ :i | (i first) = 3 ]. c => an OrderedCollection(#(3 4)) d := c first d => #(3 4) d at: 2 put: 5 d => #(3 5) b => an OrderedCollection(#(1 2) #(3 5))
Okay, I will check my other code.
Sincerely,
Joe.
On Jul 26, 2016, at 6:25 PM, Ben Coman [via Smalltalk] ml-node+s1294792n4908113h52@n4.nabble.com wrote:
Hi Joe,
As Ron said, you should not be getting a copy. If you still have a problem, perhaps best if you post code for a complete example:
- class definition (with just two instance variables)
- instance variable accessor methods
- instance creation & adding to collection
- select statement
- updating object
cheers -ben
On Wed, Jul 27, 2016 at 5:53 AM, Ron Teitelbaum <[hidden email]> wrote:
Hi Joe,
If the orderedCollection contains your object DrivingDays then select should give you the object and not a copy.
You don't need to add it back to the collection just update the object.
Check your code for anything that might be making a copy.
All the best,
Ron Teitelbaum
-----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Joseph Alotta Sent: Tuesday, July 26, 2016 3:04 PM To: [hidden email] Subject: [Newbies] indexing into a collection
Greetings,
I have a OrderedCollection of DrivingDays.
an OrderedCollection(2016-01-02| quigley s| nil|18§ 2016-01-03| marianos fresh| nil|5§ 2016-01-04| fresh thyme| nil|5§ 2016-01-05| panda express| nil|3§ 2016-01-06| peets| nil|7§ 2016-01-07| starbucks| nil|3§)
I want to select aDrivingDay object from the list by date, update it by adding mileage and places visited and put it back into the list.
If I #select the OrderedCollection, I get a copy of the item, not the same one in the OrderedCollection.
How do I select an item in the list for update?
Sincerely,
Joe.
Beginners mailing list [hidden email] http://lists.squeakfoundation.org/mailman/listinfo/beginners
If you reply to this email, your message will be added to the discussion below: http://forum.world.st/indexing-into-a-collection-tp4908090p4908113.html To start a new topic under Squeak - Beginners, email ml-node+s1294792n107673h12@n4.nabble.com To unsubscribe from Squeak - Beginners, click here. NAML
-- View this message in context: http://forum.world.st/indexing-into-a-collection-tp4908090p4908114.html Sent from the Squeak - Beginners mailing list archive at Nabble.com.
On Wed, Jul 27, 2016 at 8:13 AM, Joseph Alotta joseph.alotta@gmail.com wrote:
Ben, Ron, I made a small example, and it works as you said it would:
a := #( #(1 2) #(3 4)). b := a asOrderedCollection. b => an OrderedCollection(#(1 2) #(3 4)) c := b select: [ :i | (i first) = 3 ].
Ahh. Code examples help. Maybe what you need is #detect: which returns an element rather than a collection of elements.
c => an OrderedCollection(#(3 4)) d := c first d => #(3 4) d at: 2 put: 5 d => #(3 5) b => an OrderedCollection(#(1 2) #(3 5))
Okay, I will check my other code.
Sincerely,
Joe.
Here's a domain specific example...
Object subclass: #DrivingDays instanceVariables: 'date store mileage"?" ' ...etc...
oc := OrderedCollection new. oc add: (DrivingDays new date: '2016-01-02' ; store: 'quigley' ; mileage: 18). oc add: (DrivingDays new date: '2016-01-03' ; store: 'marianos' ; mileage: 5).
oc printString.
an OrderedCollection(2016-01-02| quigley | 18, 2016-01-03| marianos | 5)
drivingDayToUpdate := oc detect: [ :dd | dd store = 'marianos' ]. drivingDayToUpdate mileage: 7.
oc printString.
an OrderedCollection(2016-01-02| quigley | 18, 2016-01-03| marianos | 7)
(disclaimer, I am not somewhere I can run this. Its just off the top of my head.) cheers -ben
On Jul 26, 2016, at 6:25 PM, Ben Coman [via Smalltalk] <[hidden email]> wrote:
Hi Joe,
As Ron said, you should not be getting a copy. If you still have a problem, perhaps best if you post code for a complete example:
- class definition (with just two instance variables)
- instance variable accessor methods
- instance creation & adding to collection
- select statement
- updating object
cheers -ben
On Wed, Jul 27, 2016 at 5:53 AM, Ron Teitelbaum <[hidden email]> wrote:
Hi Joe,
If the orderedCollection contains your object DrivingDays then select should give you the object and not a copy.
You don't need to add it back to the collection just update the object.
Check your code for anything that might be making a copy.
All the best,
Ron Teitelbaum
-----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Joseph Alotta Sent: Tuesday, July 26, 2016 3:04 PM To: [hidden email] Subject: [Newbies] indexing into a collection
Greetings,
I have a OrderedCollection of DrivingDays.
an OrderedCollection(2016-01-02| quigley s| nil|18§ 2016-01-03| marianos fresh| nil|5§ 2016-01-04| fresh thyme| nil|5§ 2016-01-05| panda express| nil|3§ 2016-01-06| peets| nil|7§ 2016-01-07| starbucks| nil|3§)
I want to select aDrivingDay object from the list by date, update it by adding mileage and places visited and put it back into the list.
If I #select the OrderedCollection, I get a copy of the item, not the same one in the OrderedCollection.
How do I select an item in the list for update?
Sincerely,
Joe.
Hi Joe & Ben,
Ben's example is a good one. If there will be only one instance of DrivingDays in the collection for a given date then you should look at Dictionary and LookupTable. You could then add items to the collection with:
collection at: aDrivingDays date put: aDrivingDays.
and then use:
item := collection at: aDate.
to fetch the instance you want.
Lou
On Wed, 27 Jul 2016 15:51:44 +0800, Ben Coman btc@openinworld.com wrote:
On Wed, Jul 27, 2016 at 8:13 AM, Joseph Alotta joseph.alotta@gmail.com wrote:
Ben, Ron, I made a small example, and it works as you said it would:
a := #( #(1 2) #(3 4)). b := a asOrderedCollection. b => an OrderedCollection(#(1 2) #(3 4)) c := b select: [ :i | (i first) = 3 ].
Ahh. Code examples help. Maybe what you need is #detect: which returns an element rather than a collection of elements.
c => an OrderedCollection(#(3 4)) d := c first d => #(3 4) d at: 2 put: 5 d => #(3 5) b => an OrderedCollection(#(1 2) #(3 5))
Okay, I will check my other code.
Sincerely,
Joe.
Here's a domain specific example...
Object subclass: #DrivingDays instanceVariables: 'date store mileage"?" ' ...etc...
oc := OrderedCollection new. oc add: (DrivingDays new date: '2016-01-02' ; store: 'quigley' ; mileage: 18). oc add: (DrivingDays new date: '2016-01-03' ; store: 'marianos' ; mileage: 5).
oc printString.
an OrderedCollection(2016-01-02| quigley | 18, 2016-01-03| marianos | 5)
drivingDayToUpdate := oc detect: [ :dd | dd store = 'marianos' ]. drivingDayToUpdate mileage: 7.
oc printString.
an OrderedCollection(2016-01-02| quigley | 18, 2016-01-03| marianos | 7)
(disclaimer, I am not somewhere I can run this. Its just off the top of my head.) cheers -ben
On Jul 26, 2016, at 6:25 PM, Ben Coman [via Smalltalk] <[hidden email]> wrote:
Hi Joe,
As Ron said, you should not be getting a copy. If you still have a problem, perhaps best if you post code for a complete example:
- class definition (with just two instance variables)
- instance variable accessor methods
- instance creation & adding to collection
- select statement
- updating object
cheers -ben
On Wed, Jul 27, 2016 at 5:53 AM, Ron Teitelbaum <[hidden email]> wrote:
Hi Joe,
If the orderedCollection contains your object DrivingDays then select should give you the object and not a copy.
You don't need to add it back to the collection just update the object.
Check your code for anything that might be making a copy.
All the best,
Ron Teitelbaum
-----Original Message----- From: [hidden email] [mailto:[hidden email]] On Behalf Of Joseph Alotta Sent: Tuesday, July 26, 2016 3:04 PM To: [hidden email] Subject: [Newbies] indexing into a collection
Greetings,
I have a OrderedCollection of DrivingDays.
an OrderedCollection(2016-01-02| quigley s| nil|18§ 2016-01-03| marianos fresh| nil|5§ 2016-01-04| fresh thyme| nil|5§ 2016-01-05| panda express| nil|3§ 2016-01-06| peets| nil|7§ 2016-01-07| starbucks| nil|3§)
I want to select aDrivingDay object from the list by date, update it by adding mileage and places visited and put it back into the list.
If I #select the OrderedCollection, I get a copy of the item, not the same one in the OrderedCollection.
How do I select an item in the list for update?
Sincerely,
Joe.
beginners@lists.squeakfoundation.org
-
Ben Coman -
Joseph Alotta -
Louis LaBrunda -
Ron Teitelbaum