Consider the following curry implementation. What gets logged?

function curry(fn) {
  return function curried(...args) {
    if (args.length >= fn.length) {
      return fn.apply(this, args);
    }
    return function (...next) {
      return curried.apply(this, args.concat(next));
    };
  };
}

function sum(a, b, c) {
  return a + b + c;
}

const curriedSum = curry(sum);

console.log(curriedSum(1)(2)(3));
console.log(curriedSum(1, 2)(3));
console.log(curriedSum(1, 2, 3));