Returns `false` if `Left` or returns the boolean result of the application of the given predicate to the `Right` value.

Removes one level of nesting.

Constructor of Either from any couple of mutually exclusive `value` and `error`.

Constructor of Either from any lazy function that returns a couple of mutually exclusive `value` and `error`.

Constructor of Either from an Option.

Constructor of Either from a predicate.

Extracts the value out of the Either, if it exists.

Helper to check if the Either has an error.

Helper to check if the Either has a value.

Constructor for Either with a value.

Map over the Either value if it exists.

Map over the Either error if it exists.

Extracts the value out of the Either.

Constructor for Either with an error.

Base struct.