A simpler solution

[alexeisavca]

curryN solution can be simplified

[dominhhai]

Great work!
You are using args for specifying arguments but using n for checking whether the final argument came 1 == n.
I think that changing args to n will make your code more clearly because of n is used to specify arguments.

Something like following:

function curryN(fn, n) {
  // If `n` argument was omitted, use the function .length property.
  if (typeof n !== 'number') n = fn.length

    return function (arg) {
           // Implement rest of function for the final argument
        if (n <= 1) return fn(arg)
        // Otherwise, continue to calling grouped arguments with bind method
        return curryN(fn.bind(null, arg), n - 1)
    }
}

module.exports = curryN

[timoxley]

👍

[timoxley]

I've moved the solution to use bind via #69 comments welcome