function result(object, key, defaultValue) {
	      var value = object == null ? undefined : object[key];
	      if (typeof value == 'undefined') {
	        value = defaultValue;
	      }
	      return isFunction(value) ? value.call(object) : value;
	    }
Resolves the value of property `key` on `object`. If the value of `key` is
a function it is invoked with the `this` binding of `object` and its result
is returned, else the property value is returned. If the property value is
`undefined` the `defaultValue` is used in its place.

@static
@memberOf _
@category Object
@param {Object} object The object to query.
@param {string} key The key of the property to resolve.
@param {*} [defaultValue] The value returned if the property value
 resolves to `undefined`.
@returns {*} Returns the resolved value.
@example

var object = { 'user': 'fred', 'age': _.constant(40) };

_.result(object, 'user');
// => 'fred'

_.result(object, 'age');
// => 40

_.result(object, 'status', 'busy');
// => 'busy'

_.result(object, 'status', _.constant('busy'));
// => 'busy'