kare

kare

Minimal implementation of Function Currying for python.

Usage

You can curry any callable by applying the curry function to it:

from kare import curry

def my_sum(x: int, y: int, z: int) -> int:
    return x + y + z

curried_sum = curry(my_sum)

Curried functions take a single argument and return either a new function that takes a single argument or the result of applying all the arguments passed so far to the original function:

sum_two = curried_sum(2)
sum_five = sum_two(3)
sum_five(1) # == 6, equivalent to my_sum(2, 3, 1)

If you chain multiple calls together for a more succint notation:

sum_five = curried_sum(2)(3)

The curry function also works as a decorator:

@curry
def my_curried_sum(x: int, y: int, z: int) -> int:
    return x + y + z

add_six = my_curried_sum(2)(4)

Currently we only support functions with positional and specified number of arguments. The following:

@curry  # This wil raise an exception
def variadic_positional_function(*args):
    ...

@curry # This wil raise an exception
def variadic_positional_function(*, x: int, y: int):
    ...

@curry # This wil raise an exception
def variadic_positional_function(x: int, y: int, **kwargs):
    ...

If you need to do partial application on keyword arguments you can use functools' partial as usual.