dataclass-applicative¶
This packages provides functions for operating on container-like
dataclass instances.
Quick start¶
Given a dataclass,
>>> from dataclasses import dataclass
>>> from dataclass_applicative import amap, fmap, gather, pure, names, values
>>> @dataclass
... class F:
... x: object
... y: object
... z: object
we can list its fields;
>>> list(names(F))
['x', 'y', 'z']
list its values;
>>> list(values(F(1, 2, 3)))
[1, 2, 3]
default-construct new instances;
>>> pure(F, 1)
F(x=1, y=1, z=1)
apply a function to those values;
>>> fmap(str, F(1, 2, 3))
F(x='1', y='2', z='3')
or apply functions stored in one object to values stored in another;
>>> amap(F(str, lambda _: 999, lambda z: z + 1), F(1, 2, 3))
F(x='1', y=999, z=4)
and gather all attributes from many instances into tuples in a new object:
>>> gather(F(1, 2, 3), F(10, 11, 12), F(3, 2, 1), F(0, 0, 0))
F(x=(1, 10, 3, 0), y=(2, 11, 2, 0), z=(3, 12, 1, 0))