bgl gwyng: Existential Lens란걸 알게되었는데 정의는 다음과 같다 data Lens s a = forall c. Lens (s -> (c, a)) ((c, a) -> s) 돌무식 렌즈(get, set 레코드)보다는 좀더 어렵지만 Van Laarhoven Lens보다는 훨씬 더 직관적이라서 렌즈의 이해에 도움이 많이 되었다. 전체 설명은 요깄다.

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bgl gwyng @bgl@hackers.pub

6/15/2025, 10:23:46 AM

Public

Existential Lens란걸 알게되었는데 정의는 다음과 같다

data Lens s a = forall c. Lens (s -> (c, a)) ((c, a) -> s)

돌무식 렌즈(get, set 레코드)보다는 좀더 어렵지만 Van Laarhoven Lens보다는 훨씬 더 직관적이라서 렌즈의 이해에 도움이 많이 되었다.

전체 설명은 요깄다.

Existential optics

A presentation of an alternative encoding for optics such as lenses and prisms using existential types.

tweag.io

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