Create: 2023-08-28 Update: 2025-07-06 09:17:26

cmp: add Or

Недавно принятый небольшой proposal, не от авторов языка (что не такая уж и редкость), суть которого в очень простой функции — получение первого не пустого элемента из произвольного набора. Несмотря на то, что предложение кажется странным, подобная функция встречается достаточно часто на практике. Изначальный proposal был про получение первой не пустой строки из набора строк, но в итоге было решено сделать обобщенную функцию которая подходит для любых типов. И тут начались проблемы…

Я уже говорил о том, что proposal о zero ждут авторы кода с дженериками? Так вот это тот самый случай: сейчас cmp.Or нельзя реализовать без использования констрейнта comparable на дженериках. Который, в свою очередь, не работает с любыми типами внутри которых есть несравниваемые поля - например слайсы. А разгадка проста: для сравнения с нулем/пустой переменной сейчас авторы дженерик кода вынуждены создавать пустую переменную и проводить сравнивание с ней. Что довольно сильно ограничивает список типов с которыми такой код может работать.

Ссылка для желающих поиграться на практике.

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cmp: add Or · Issue #60204 · golang/go

An extremely common string operation is testing if a string is blank and if so replacing it with a default value. I propose adding First(...strings) string to package strings (and probably an equiv...

hottg.com/go_update/31

3.0K viewsedited Aug 28, 2023 at 16:46

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cmp: add Or

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