Vector Array subclass

curriedVector.js

var Vector = function(values) {
  var vector = !(values instanceof Array) ?
    Array.prototype.slice.call(arguments) :
    values;
  return function(i) {
    if(typeof i === 'number')
      return vector[i];
    else
      return vector;
  };
};

vector.js

var Vector = function() {
  values = Array.prototype.slice.call(arguments);
  values.sum = function() {
    var sum = 0.0;
    values.map(function(e) { sum += e; });
    return sum;
  }
  return values;
};