code: function mixin(object, source) {
        var ctor = object,
            isFunc = !source || isFunction(ctor);
  
        if (!source) {
          ctor = lodashWrapper;
          source = object;
          object = lodash;
        }
        forEach(functions(source), function(methodName) {
          var func = object[methodName] = source[methodName];
          if (isFunc) {
            ctor.prototype[methodName] = function() {
              var value = this.__wrapped__,
                  args = [value];
  
              push.apply(args, arguments);
              var result = func.apply(object, args);
              if (value && typeof value == 'object' && value === result) {
                return this;
              }
              result = new ctor(result);
              result.__chain__ = this.__chain__;
              return result;
            };
          }
        });
      }
docs: Adds function properties of a source object to the `lodash` function and
  chainable wrapper.
  
  @static
  @memberOf _
  @category Utilities
  @param {Object} object The object of function properties to add to `lodash`.
  @param {Object} object The object of function properties to add to `lodash`.
  @example
  
  _.mixin({
  'capitalize': function(string) {
  return string.charAt(0).toUpperCase() + string.slice(1).toLowerCase();
  }
  });
  
  _.capitalize('moe');
  // => 'Moe'
  
  _('moe').capitalize();
  // => 'Moe'