Currying is ok I guess

use.md

> const curry = require('./curry')
> const add3 = (a, b, c) => a + b + c
> add3(1, 2, 3)
6
> const curAdd3 = curry(add3)
> curAdd3(1)
[Function]
> curAdd3(1, 2)
[Function]
> curAdd3(1, 2, 3)
6
> curAdd3(1)(2, 3)
6
> curAdd3(1)(2)(3)
6
> const nums = [1, 2, 3]
> curAdd3(...nums)
6
> curAdd3(...nums.slice(1))
[Function]

variadic.js

const curry = (f, prevArgs = []) => (...nextArgs) => {
  const args = [...prevArgs, ...nextArgs]

  if (f.length === args.length) {
    return f(...args)
  } else {
    return curry(f, args)
  }
}

module.exports = (f) => curry(f)