which is the nicer validation syntax?

gistfile1.js

// What's the best syntax to validate a JSON object?
var addr = { NamePrefixText: "Dr.", FirstName: "Lex", LastName: "Luthor",
             Address: ["5 Upper Ter"], CityName: "SF" };
Validate(addr, Address);  // returns true if valid, errors go in an error object like AR


// Here are some possibilities:

// implicit type
var Address = {
  NamePrefixText  : Valid.oneOf("", "Mr.", "Mrs.", "Ms.", "Dr."),
  FirstName       : Valid.nonBlank(),
  MiddleName      : Valid.string().optional(),
  LastName        : Valid.nonBlank(),
  Address         : Valid.length(1,2).arrayOf(Valid().string()),
  CityName        : Valid.nonBlank(),
};


// explicit type passed to constructor
var Address = {
  NamePrefixText  : Valid('string').oneOf("", "Mr.", "Mrs.", "Ms.", "Dr."),
  FirstName       : Valid('string').nonBlank(),
  MiddleName      : Valid('string').optional(),
  LastName        : Valid('string').nonBlank(),
  Address         : Valid('array').length(0,2).arrayOf(Valid().string()),
  CityName        : Valid('string').nonBlank(),
};


// explict type chained
var Address = {
  NamePrefixText  : Valid.string().oneOf("", "Mr.", "Mrs.", "Ms.", "Dr."),
  FirstName       : Valid.string().nonBlank(),
  MiddleName      : Valid.string().optional(),
  LastName        : Valid.string().nonBlank(),
  Address         : Valid.array(Valid().string()).length(1,2)
  CityName        : Valid.string().nonBlank(),
};


// function objects (current scheme, ugh)
var Address = {
  NamePrefixText  : Val.IsOneOf("", "Mr.", "Mrs.", "Ms.", "Dr."),
  FirstName       : Val.IsNonBlankString,
  MiddleName      : Val.IsString,
  LastName        : Val.IsNonBlankString,
  Address         : Val.IsArray(IsString, {min: 1, max : 2}),
  CityName        : Val.IsNonBlankString,
};