currying is a mechanism to pre-fill arguments of a later function call

curry.js

if (!Function.prototype.curry) {
  (function () {
    var slice = Array.prototype.slice;

    Function.prototype.curry = function () {
      var target = this;
      var args = slice.call(arguments);

      return function () {
        var allArgs = args;

        if (arguments.length > 0) {
          allArgs = args.concat(slice.call(arguments));
        }

        return target.apply(this, allArgs);
      };
    };
  }());
}