Method: Creates a lazy-option with the given callback.

Method: Creates an option given a return value.

Method: Returns the value if available, or throws an exception otherwise.

Method: Returns the value if available, or the results of the callable.

Method: Returns the value if available, or the default value if not.

Method: Returns the value if available, or throws the passed exception.

Method: This is similar to map() below except that the return value has no meaning; the passed callable is simply executed if the option is non-empty, and ignored if the option is empty.

Method: Returns true if a value is available, false otherwise.

Method: Returns true if no value is available, false otherwise.

Method: Applies the callable to the value of the option if it is non-empty, and returns the return value of the callable wrapped in Some().