Module `datatap.utils.or_nullish`

Expand source code

from typing import Optional, TypeVar, Callable

_T = TypeVar("_T")
_S = TypeVar("_S")

class OrNullish:
    """
    A helper class to represent the monad `α OrNullish = α | None`.
    """

    @staticmethod
    def bind(val: Optional[_T], fn: Callable[[_T], Optional[_S]]) -> Optional[_S]:
        """
        Monadically binds `fn` to the value of `val`.
        """
        if val is None:
            return None
        else:
            return fn(val)

Classes

class OrNullish

A helper class to represent the monad α OrNullish = α | None.

Expand source code

class OrNullish:
    """
    A helper class to represent the monad `α OrNullish = α | None`.
    """

    @staticmethod
    def bind(val: Optional[_T], fn: Callable[[_T], Optional[_S]]) -> Optional[_S]:
        """
        Monadically binds `fn` to the value of `val`.
        """
        if val is None:
            return None
        else:
            return fn(val)

Static methods

def bind(val: Optional[~_T], fn: Callable[[~_T], Optional[~_S]]) ‑> Optional[~_S]

Monadically binds fn to the value of val.

Expand source code

@staticmethod
def bind(val: Optional[_T], fn: Callable[[_T], Optional[_S]]) -> Optional[_S]:
    """
    Monadically binds `fn` to the value of `val`.
    """
    if val is None:
        return None
    else:
        return fn(val)