Merge options param to a defaults object (first draft)

options-pattern.js

    /**
     * Optional params pattern.
     * Merge a user defined object with a default one.
     */
    setOptions: function(defaults, options) {
      /* Force the obj param to be an object literal */
      if (typeof defaults !== 'object') defaults = {};
      if (typeof options !== 'object') options = {};
      
      /*
       * For every property of the `defaults` object
       * we check if the `options` object has defined
       * the same property, and if it's the case
       * we merge the newer property to the `defaults`
       * object.
       */
      for (var prop in defaults) {
        if (defaults.hasOwnProperty(prop)) {
          /* Actual merge */
          if (options[prop]) defaults[prop] = options[prop];
        }
      }
    }