Question

This blogpost proposed this implementation of a curried addition function:

def addN(n):
    return lambda x: x + n

def plus(a, b):
    addA=addN(a)
    return addA(b)

I believe my version is more correct because it uses unary functions all the way.

from operator import add
plus = lambda a: lambda b: add(a, b) 
plus(1)(2)

What do you think ?

Answer 1

Your plus function is identical to the addN function from the blog post. The only differences are:

1. You used a lambda where the blog post used a def.
2. For some reason you used operator.add(a,b) instead of simply a+b.

Usage of plus and addN will give the same results so neither one is more “correct”.

Note that the function naming you chose is confusing since your plus function corresponds to the addN function (rather than the plus function) from the blog post.