code: function pick(object, callback, thisArg) {
        var result = {};
        if (typeof callback != 'function') {
          var index = -1,
              props = baseFlatten(arguments, true, false, 1),
              length = isObject(object) ? props.length : 0;
  
          while (++index < length) {
            var key = props[index];
            if (key in object) {
              result[key] = object[key];
            }
          }
        } else {
          callback = lodash.createCallback(callback, thisArg, 3);
          forIn(object, function(value, key, object) {
            if (callback(value, key, object)) {
              result[key] = value;
            }
          });
        }
        return result;
      }
docs: Creates a shallow clone of `object` composed of the specified properties.
  Property names may be specified as individual arguments or as arrays of
  property names. If a callback is provided it will be executed for each
  property of `object` picking the properties the callback returns truey
  for. The callback is bound to `thisArg` and invoked with three arguments;
  (value, key, object).
  
  @static
  @memberOf _
  @category Objects
  @param {Object} object The source object.
  @param {Function|...string|string[]} [callback] The function called per
  iteration or property names to pick, specified as individual property
  names or arrays of property names.
  @param {*} [thisArg] The `this` binding of `callback`.
  @returns {Object} Returns an object composed of the picked properties.
  @example
  
  _.pick({ 'name': 'fred', '_userid': 'fred1' }, 'name');
  // => { 'name': 'fred' }
  
  _.pick({ 'name': 'fred', '_userid': 'fred1' }, function(value, key) {
  return key.charAt(0) != '_';
  });
  // => { 'name': 'fred' }