Created a branch here
<https://github.com/elixir-lang/elixir/compare/main...christhekeele:elixir:if-else-do-end>
if folk wanna play with this form and see if it improves readability around
conditional re-assignment in their
codebases:
https://github.com/elixir-lang/elixir/compare/main...christhekeele:elixir:if-else-do-end
map = %{}
condition = true
map = if condition, else: map do
Map.put(map, :key, :value)
end
#=> %{key: :value}
On Friday, December 6, 2024 at 7:02:48 PM UTC-6 sabi...@gmail.com wrote:
> For reference, there has been a previous discussion about then_if:
>
> https://groups.google.com/g/elixir-lang-core/c/uM_M-DWh42A/m/6pNKZcLyAQAJ?pli=1
>
>
> Le ven. 6 déc. 2024 à 23:59, José Valim <jose....@gmail.com> a écrit :
>
>> Hi Juan!
>>
>> My initial gut feeling is that this approach does not scale. What if you
>> want to delete a key conditionally? Should we have delete_if?
>>
>> It feels a more general approach would be to introduce `then_if`:
>>
>> then_if(subject, condition?, function)
>>
>> Or similar. :)
>>
>> *José Valimhttps://dashbit.co/ <https://dashbit.co/>*
>>
>>
>> On Fri, Dec 6, 2024 at 3:27 PM Juan Manuel Azambuja <ju...@mimiquate.com>
>> wrote:
>>
>>> Hello,
>>>
>>> After working with Elixir for some time I have found myself repeating
>>> some patterns when dealing with maps.
>>>
>>> One pattern I see repeated constantly in different apps developed by
>>> myself or others is adding values to a map conditionally or returning the
>>> map unchanged. This comes in different flavors:
>>>
>>> [image: Screenshot 2024-12-06 at 11.13.23 AM.png]
>>> or
>>> [image: Screenshot 2024-12-06 at 11.14.32 AM.png]
>>>
>>> When this pattern gets used enough in an app, it's normal to see it
>>> abstracted in a MapUtils module that updates the map conditionally if a
>>> condition is met or returns the map unchanged otherwise.
>>>
>>> My proposal is to include Map.put_if/4 which would abstract the
>>> condition check and return the map unchanged if the condition is not met:
>>>
>>> [image: Screenshot 2024-12-06 at 11.17.21 AM.png]
>>>
>>> Enhancing the API by doing this will result in less code and more
>>> readable solutions.
>>>
>>> Thanks for reading!
>>>
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>>> .
>>>
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> To view this discussion visit
>> https://groups.google.com/d/msgid/elixir-lang-core/CAGnRm4%2BLFJvKvdZX%3DnZEJj77sjmkXNm19KQz_vJr%2BAmKrecXPQ%40mail.gmail.com
>>
>> <https://groups.google.com/d/msgid/elixir-lang-core/CAGnRm4%2BLFJvKvdZX%3DnZEJj77sjmkXNm19KQz_vJr%2BAmKrecXPQ%40mail.gmail.com?utm_medium=email&utm_source=footer>
>> .
>>
>
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