Function flatten

Flattens nested options in one level. This function is similar to Option.flatten but more typesafe.

Using this function is possible to ensure at compile time that the target is optional is actually a nested optional.

Example

const opt1 = Option.Some(Option.Some(10))
flatten(opt1).unwrap() // 10

const opt2: Option<Option<string>> = Option.None()
const flatten2: Option<string>= flatten(opt2)
flatten2.isNone() // true
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