just as named

auto-curry-fixed-length-function.js

const curry = f => (...args) =>
  args.length < f.length
    ? curry(f.bind(undefined, ...args))
    : f(...args)
//  : f(...args.slice(0, f.length))

const add = (a, b, c) => a + b + c

const cAdd = curry(add)

cAdd(1,2,3)//6
cAdd(1)(2,3)//6
cAdd(1)(2)(3)//6
cAdd(1,2)(3)//6