partition method

@override (Option<T>, Option<T>) partition(bool f(T t))

Return a record. If this Option is a Some:

• if f applied to its value returns true, then the tuple contains this Option as second value
• if f applied to its value returns false, then the tuple contains this Option as first value Otherwise the tuple contains both None.

Implementation

@override
(Option<T>, Option<T>) partition(bool Function(T t) f) =>
    (filter((a) => !f(a)), filter(f));