### Curry

Use recursion.
If the number of provided arguments (`args`) is sufficient, call the passed function `f`.
Otherwise return a curried function `f` that expects the rest of the arguments.
If you want to curry a function that accepts a variable number of arguments (a variadic function, e.g. `Math.min()`), you can optionally pass the number of arguments to the second parameter `arity`.

```js
const curry = (f, arity = f.length, next) =>
  (next = prevArgs =>
    nextArg => {
      const args = [ ...prevArgs, nextArg ];
      return args.length >= arity ? f(...args) : next(args);
    }
  )([]);
// curry(Math.pow)(2)(10) -> 1024
// curry(Math.min, 3)(10)(50)(2) -> 2
```