// Tiny, recursive autocurry
const curry = (
  f, arr = []
) => (...args) => (
  a => a.length === f.length ?
    f(...a) :
    curry(f, a)
)([...arr, ...args]);

Hi, great post!

What is the a here? I tried throwing a log here but a was undefined once I put this in between curly brackets. Is a the passed in ...args?

Thanks!