lodash/result.js

import baseToPath from './_baseToPath';
import get from './get';
import isFunction from './isFunction';
import isKey from './_isKey';
import parent from './_parent';

/**
 * 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
 * @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 if the resolved value is `undefined`.
 * @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) {
  if (!isKey(path, object)) {
    path = baseToPath(path);
    var result = get(object, path);
    object = parent(object, path);
  } else {
    result = object == null ? undefined : object[path];
  }
  if (result === undefined) {
    result = defaultValue;
  }
  return isFunction(result) ? result.call(object) : result;
}

export default result;