currying.js

Function.prototype.method = function (name, func) {
  if (!this.prototype[name]) {
    this.prototype[name] = func;
    return this;
  }
};

Function.method('curry', function () {
  var slice = Array.prototype.slice,
      args = slice.apply(arguments),
      that = this;
  return function () {
    return that.apply(null, args.concat(slice.apply(arguments)));
  };
});

function add(a, b) {
  return a+b;
}
var add1 = add.curry(1);
console.log(add1(6));