Implementing the Curry function in JavaScript for arbitrary number of arguments

curry-es5.js

function curry(func) {
  var slice = Array.prototype.slice,
      args = slice.call(arguments, 1);
  return function () {
    return func.apply(
      null,
      args.concat(slice.call(arguments, 0))
    );
  };
}

curry-es6.js

function curry(func, ...first) {
  return function (...second) {
    return func(...first, ...second);
  }
}