Tiny jQuery plugin fData for works with form as a json object

jquery.fData.js

$.fn.fData = function(_data) {

  var $form = this;

  if (!_data) {
    return $form.serializeArray().reduce(function(obj, field) {
      obj[field.name] = field.value;
      return obj;
    }, {});
  }

  $.each(_data, function(key, val) {
    $form[0][key].value = val;
  });

  return _data;
};

// Example
var form = $('form');

// Return json object of form
console.log(form.fData());

// Fill form
form.fData({
  userName: 'Sanya',
  email: '[email protected]',
  age: 32
})