HORIZON PROJECT

var castPath = require('./_castPath'),

    isFunction = require('./isFunction'),

    toKey = require('./_toKey');

/**

 * This method is like `_.get` except that if the resolved value is a

 * function it's invoked with the `this` binding of its parent object and

 * its result is returned.

 *

 * @static

 * @since 0.1.0

 * @memberOf _

 * @category Object

 * @param {Object} object The object to query.

 * @param {Array|string} path The path of the property to resolve.

 * @param {*} [defaultValue] The value returned for `undefined` resolved values.

 * @returns {*} Returns the resolved value.

 * @example

 *

 * var object = { 'a': [{ 'b': { 'c1': 3, 'c2': _.constant(4) } }] };

 *

 * _.result(object, 'a[0].b.c1');

 * // => 3

 *

 * _.result(object, 'a[0].b.c2');

 * // => 4

 *

 * _.result(object, 'a[0].b.c3', 'default');

 * // => 'default'

 *

 * _.result(object, 'a[0].b.c3', _.constant('default'));

 * // => 'default'

 */

function result(object, path, defaultValue) {

  path = castPath(path, object);

  var index = -1,

      length = path.length;

  // Ensure the loop is entered when path is empty.

  if (!length) {

    length = 1;

    object = undefined;

  }

  while (++index < length) {

    var value = object == null ? undefined : object[toKey(path[index])];

    if (value === undefined) {

      index = length;

      value = defaultValue;

    }

    object = isFunction(value) ? value.call(object) : value;

  }

  return object;

}

module.exports = result;