Quantcast

Convert Literal array into Dynamic array

Previous Topic Next Topic
 
classic Classic list List threaded Threaded
5 messages Options
Reply | Threaded
Open this post in threaded view
|  
Report Content as Inappropriate

Convert Literal array into Dynamic array

chrismihaylyk
HI, friends!

Can anyone help me how to convert literal array: #(2 3 4)
into the dynamic array: {2. 3. 4}?

Thanks a lot, Khrystyna!
Reply | Threaded
Open this post in threaded view
|  
Report Content as Inappropriate

Re: Convert Literal array into Dynamic array

EstebanLM

> On 16 Apr 2017, at 16:37, chrismihaylyk <[hidden email]> wrote:
>
> HI, friends!
>
> Can anyone help me how to convert literal array: #(2 3 4)
> into the dynamic array: {2. 3. 4}?

this is not a dynamic array (that does not exist on Pharo).
check, if you do:

#(2 3 4) =  {2. 3. 4} ==> true

and:

#(2 3 4) class =  {2. 3. 4} class ==> true

in fact, the only difference between them is that the first is literal (it will be as is in the compiled code) and the second is a runtime array (it will be evaluated on execution).

Now, perhaps what you want is to transform an Array into a Collection that accepts additions (that would be a “dynamic” collection on Pharo)..

For that you can do:

a := #(2 3 4) asOrderedCollection.
a add: 5.

a ==> anOrderedCollection(2 3 4 5).

(note that you could want a Set… or whatever… but the most common transformation is an array into an OrderedCollection (because it preserves order, etc.)

cheers,
Esteban

>
> Thanks a lot, Khrystyna!
>
>
>
> --
> View this message in context: http://forum.world.st/Convert-Literal-array-into-Dynamic-array-tp4942305.html
> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.
>


Reply | Threaded
Open this post in threaded view
|  
Report Content as Inappropriate

Re: Convert Literal array into Dynamic array

chrismihaylyk
Thank you very much!
Now I understand.

Actually, I need this interpretation {7. 8. "f"} for writing parser of javascript queries which is used in MongoDB shell, to be able to execute this with  MongoQuery Pharo class.
Maybe, you could help me how to implement it?

2017-04-16 18:19 GMT+03:00 Esteban Lorenzano <[hidden email]>:

> On 16 Apr 2017, at 16:37, chrismihaylyk <[hidden email]> wrote:
>
> HI, friends!
>
> Can anyone help me how to convert literal array: #(2 3 4)
> into the dynamic array: {2. 3. 4}?

this is not a dynamic array (that does not exist on Pharo).
check, if you do:

#(2 3 4) =  {2. 3. 4} ==> true

and:

#(2 3 4) class =  {2. 3. 4} class ==> true

in fact, the only difference between them is that the first is literal (it will be as is in the compiled code) and the second is a runtime array (it will be evaluated on execution).

Now, perhaps what you want is to transform an Array into a Collection that accepts additions (that would be a “dynamic” collection on Pharo)..

For that you can do:

a := #(2 3 4) asOrderedCollection.
a add: 5.

a ==> anOrderedCollection(2 3 4 5).

(note that you could want a Set… or whatever… but the most common transformation is an array into an OrderedCollection (because it preserves order, etc.)

cheers,
Esteban

>
> Thanks a lot, Khrystyna!
>
>
>
> --
> View this message in context: http://forum.world.st/Convert-Literal-array-into-Dynamic-array-tp4942305.html
> Sent from the Pharo Smalltalk Users mailing list archive at Nabble.com.
>



Reply | Threaded
Open this post in threaded view
|  
Report Content as Inappropriate

Re: Convert Literal array into Dynamic array

Ben Coman

On Mon, Apr 17, 2017 at 1:30 AM, Христина Михайлюк <[hidden email]> wrote:

Actually, I need this interpretation {7. 8. "f"} for writing parser of javascript queries which is used in MongoDB shell, to be able to execute this with  MongoQuery Pharo class.
Maybe, you could help me how to implement it?

Do you mean parsing Json syntax? 
https://www.mongodb.com/json-and-bson

Maybe this is useful 
https://ci.inria.fr/pharo-contribution/job/EnterprisePharoBook/lastSuccessfulBuild/artifact/book-result/NeoJSON/NeoJSON.html

cheers -ben


Reply | Threaded
Open this post in threaded view
|  
Report Content as Inappropriate

Re: Convert Literal array into Dynamic array

chrismihaylyk
Thanks!
But I've just handled it by using STON fromString:

Khrystyna.

2017-04-17 19:14 GMT+03:00 Ben Coman <[hidden email]>:

On Mon, Apr 17, 2017 at 1:30 AM, Христина Михайлюк <[hidden email]> wrote:

Actually, I need this interpretation {7. 8. "f"} for writing parser of javascript queries which is used in MongoDB shell, to be able to execute this with  MongoQuery Pharo class.
Maybe, you could help me how to implement it?

Do you mean parsing Json syntax? 
https://www.mongodb.com/json-and-bson

Maybe this is useful 
https://ci.inria.fr/pharo-contribution/job/EnterprisePharoBook/lastSuccessfulBuild/artifact/book-result/NeoJSON/NeoJSON.html

cheers -ben



Loading...