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When I have an Option<Result<T, E>> but need a Result<Option<T>, E> (lemmy.ml)

submitted 2 days ago by [email protected] to c/[email protected]

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[–] [email protected] 7 points 2 days ago (1 children)

@Ephera you have to be a connoisseur to understand this one 🙂

[–] [email protected] 3 points 1 day ago (2 children)

Care to explain for the uninitiated like me? It feels like a meme, but conceptually an Option is very different from a Result, maybe I'm overthinking but to me an Option None means no action was taken (e.g. a function that runs every loop to take an action every second will return None most times and Some when it executes), whereas an Ok(None) means an action was taken and it has nothing to return (e.g. a function that safely reads a value from a JSON file, it didn't failed reading the file so it's an Ok, but the value wasn't there so it's None).

[–] [email protected] 7 points 1 day ago (1 children)

You can use transpose() to go from Option<Result<T>> to Result<Option<T>> and vice versa.

The "meme" is a trans pride flag and a human pose.

[–] howrar 5 points 22 hours ago

Ah, so a trans pose.

Nice.

[–] [email protected] 2 points 20 hours ago

It's just a "joke" about the method name.