import castPath from './_castPath.js'; import isFunction from './isFunction.js'; import toKey from './_toKey.js'; /** * 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; } export default result;