Please to not use an unary on Symbol Dispatch on something. self class environment at: #Array is the best For Modules, we made progress and got bitten by many issues and teaching load. Stef On Sat, Feb 10, 2018 at 4:50 PM, Clément Bera <bera.clement@gmail.com> wrote:
On Sat, Feb 10, 2018 at 4:34 PM, Hernán Morales Durand <hernan.morales@gmail.com> wrote:
Hi Clément,
First time I read about modules in Pharo. What is a module exactly?
What's the problem to solve?
It's similar to namespaces with some different, arguably better, features.
Honestly I am not the expert on it so I would like some one else to answer.
Among other things, it solves the problem of having 2 classes with the same name (avoiding the prefixes we have like in C). But reportedly that's just a side-effect and not the main problem to solve.
Cheers,
Hernán
2018-02-10 9:47 GMT-03:00 Clément Bera <bera.clement@gmail.com>:
Hi,
In short, everything that is not namespace/module compatible will be deprecated/changed/removed in the future, so it is not recommended to use it.
a.2) #Array asClassInEnvironment: Smalltalk globals b.1) Smalltalk globals at: #Array => Ok-ish, note that you may need to change 'Smalltalk globals' the namespace/module when support for those will be added since Array will be in a module. Maybe you want instead to use instead:
c) self class environment at: #Array => this will work in the future if your code is a class which environment/namespace/module includes the Array class you would expect
a.1) #Array asClass b.2) Smalltalk at: #Array b.3) Smalltalk classNamed: #Array => In which namespace/module are you looking for #Array ? In the future this may be removed, alternatively it will work only for globals but not globals inside namespace/module which won't work since Array will be in a module.
On Sat, Feb 10, 2018 at 12:57 PM, Peter Uhnák <i.uhnak@gmail.com> wrote:
Hi,
what is the canonical way to get a class from a symbol?
a) Converting symbol into class via string protocol
a.1) #Array asClass I use this the most, because it is easy, uses unary selector, and so far I've never ran into any issues. But apparently it is not good -- why?
a.2) #Array asClassInEnvironment: Smalltalk globals
b) Retriving the class by key from the system dictionary
b.1) Smalltalk globals at: #Array
b.2) Smalltalk at: #Array
b.3) Smalltalk classNamed: #Array
c) something else entirely?
I get that using #asClass wouldn't work if there was a different environment, however I don't even know in what situation there could be a different environment, so I cannot assert how problematic it is or isn't.
Thanks, Peter
-- Clément Béra Pharo consortium engineer https://clementbera.wordpress.com/ Bâtiment B 40, avenue Halley 59650 Villeneuve d'Ascq
-- Clément Béra Pharo consortium engineer https://clementbera.wordpress.com/ Bâtiment B 40, avenue Halley 59650 Villeneuve d'Ascq