Bump to v4.3.0.

lodash.result/index.js

@@ -1,31 +1,28 @@
 /**
- * lodash 4.2.1 (Custom Build) <https://lodash.com/>
+ * lodash 4.3.0 (Custom Build) <https://lodash.com/>
  * Build: `lodash modularize exports="npm" -o ./`
- * Copyright 2012-2016 The Dojo Foundation <http://dojofoundation.org/>
+ * Copyright jQuery Foundation and other contributors <https://jquery.org/>
+ * Released under MIT license <https://lodash.com/license>
  * Based on Underscore.js 1.8.3 <http://underscorejs.org/LICENSE>
- * Copyright 2009-2016 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
- * Available under MIT license <https://lodash.com/license>
+ * Copyright Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
  */
-var baseSlice = require('lodash._baseslice'),
-    toString = require('lodash.tostring');
+var stringToPath = require('lodash._stringtopath');
 
 /** `Object#toString` result references. */
 var funcTag = '[object Function]',
-    genTag = '[object GeneratorFunction]';
+    genTag = '[object GeneratorFunction]',
+    symbolTag = '[object Symbol]';
 
 /** Used to match property names within property paths. */
 var reIsDeepProp = /\.|\[(?:[^[\]]*|(["'])(?:(?!\1)[^\\]|\\.)*?\1)\]/,
-    reIsPlainProp = /^\w*$/,
-    rePropName = /[^.[\]]+|\[(?:(-?\d+(?:\.\d+)?)|(["'])((?:(?!\2)[^\\]|\\.)*?)\2)\]/g;
-
-/** Used to match backslashes in property paths. */
-var reEscapeChar = /\\(\\)?/g;
+    reIsPlainProp = /^\w*$/;
 
 /** Used for built-in method references. */
 var objectProto = Object.prototype;
 
 /**
- * Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
+ * Used to resolve the
+ * [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
  * of values.
  */
 var objectToString = objectProto.toString;
@@ -37,30 +34,10 @@ var objectToString = objectProto.toString;
  * @param {*} value The value to inspect.
  * @returns {Array} Returns the cast property path array.
  */
-function baseCastPath(value) {
+function castPath(value) {
   return isArray(value) ? value : stringToPath(value);
 }
 
-/**
- * The base implementation of `_.get` without support for default values.
- *
- * @private
- * @param {Object} object The object to query.
- * @param {Array|string} path The path of the property to get.
- * @returns {*} Returns the resolved value.
- */
-function baseGet(object, path) {
-  path = isKey(path, object) ? [path + ''] : baseCastPath(path);
-
-  var index = 0,
-      length = path.length;
-
-  while (object != null && index < length) {
-    object = object[path[index++]];
-  }
-  return (index && index == length) ? object : undefined;
-}
-
 /**
  * Checks if `value` is a property name and not a property path.
  *
@@ -70,50 +47,26 @@ function baseGet(object, path) {
  * @returns {boolean} Returns `true` if `value` is a property name, else `false`.
  */
 function isKey(value, object) {
-  if (typeof value == 'number') {
+  var type = typeof value;
+  if (type == 'number' || type == 'symbol') {
     return true;
   }
   return !isArray(value) &&
-    (reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
+    (isSymbol(value) || reIsPlainProp.test(value) || !reIsDeepProp.test(value) ||
       (object != null && value in Object(object)));
 }
 
-/**
- * Gets the parent value at `path` of `object`.
- *
- * @private
- * @param {Object} object The object to query.
- * @param {Array} path The path to get the parent value of.
- * @returns {*} Returns the parent value.
- */
-function parent(object, path) {
-  return path.length == 1 ? object : get(object, baseSlice(path, 0, -1));
-}
-
-/**
- * Converts `string` to a property path array.
- *
- * @private
- * @param {string} string The string to convert.
- * @returns {Array} Returns the property path array.
- */
-function stringToPath(string) {
-  var result = [];
-  toString(string).replace(rePropName, function(match, number, quote, string) {
-    result.push(quote ? string.replace(reEscapeChar, '$1') : (number || match));
-  });
-  return result;
-}
-
 /**
  * Checks if `value` is classified as an `Array` object.
  *
  * @static
  * @memberOf _
+ * @since 0.1.0
  * @type {Function}
  * @category Lang
  * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ * @returns {boolean} Returns `true` if `value` is correctly classified,
+ *  else `false`.
  * @example
  *
  * _.isArray([1, 2, 3]);
@@ -135,9 +88,11 @@ var isArray = Array.isArray;
  *
  * @static
  * @memberOf _
+ * @since 0.1.0
  * @category Lang
  * @param {*} value The value to check.
- * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ * @returns {boolean} Returns `true` if `value` is correctly classified,
+ *  else `false`.
  * @example
  *
  * _.isFunction(_);
@@ -155,11 +110,13 @@ function isFunction(value) {
 }
 
 /**
- * Checks if `value` is the [language type](https://es5.github.io/#x8) of `Object`.
- * (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
+ * Checks if `value` is the
+ * [language type](http://www.ecma-international.org/ecma-262/6.0/#sec-ecmascript-language-types)
+ * of `Object`. (e.g. arrays, functions, objects, regexes, `new Number(0)`, and `new String('')`)
  *
  * @static
  * @memberOf _
+ * @since 0.1.0
  * @category Lang
  * @param {*} value The value to check.
  * @returns {boolean} Returns `true` if `value` is an object, else `false`.
@@ -183,45 +140,68 @@ function isObject(value) {
 }
 
 /**
- * Gets the value at `path` of `object`. If the resolved value is
- * `undefined` the `defaultValue` is used in its place.
+ * Checks if `value` is object-like. A value is object-like if it's not `null`
+ * and has a `typeof` result of "object".
  *
  * @static
  * @memberOf _
- * @category Object
- * @param {Object} object The object to query.
- * @param {Array|string} path The path of the property to get.
- * @param {*} [defaultValue] The value returned if the resolved value is `undefined`.
- * @returns {*} Returns the resolved value.
+ * @since 4.0.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is object-like, else `false`.
  * @example
  *
- * var object = { 'a': [{ 'b': { 'c': 3 } }] };
+ * _.isObjectLike({});
+ * // => true
  *
- * _.get(object, 'a[0].b.c');
- * // => 3
+ * _.isObjectLike([1, 2, 3]);
+ * // => true
  *
- * _.get(object, ['a', '0', 'b', 'c']);
- * // => 3
+ * _.isObjectLike(_.noop);
+ * // => false
  *
- * _.get(object, 'a.b.c', 'default');
- * // => 'default'
+ * _.isObjectLike(null);
+ * // => false
  */
-function get(object, path, defaultValue) {
-  var result = object == null ? undefined : baseGet(object, path);
-  return result === undefined ? defaultValue : result;
+function isObjectLike(value) {
+  return !!value && typeof value == 'object';
 }
 
 /**
- * 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.
+ * Checks if `value` is classified as a `Symbol` primitive or object.
  *
  * @static
  * @memberOf _
+ * @since 4.0.0
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is correctly classified,
+ *  else `false`.
+ * @example
+ *
+ * _.isSymbol(Symbol.iterator);
+ * // => true
+ *
+ * _.isSymbol('abc');
+ * // => false
+ */
+function isSymbol(value) {
+  return typeof value == 'symbol' ||
+    (isObjectLike(value) && objectToString.call(value) == symbolTag);
+}
+
+/**
+ * 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 if the resolved value is `undefined`.
+ * @param {*} [defaultValue] The value returned for `undefined` resolved values.
  * @returns {*} Returns the resolved value.
  * @example
  *
@@ -240,17 +220,25 @@ function get(object, path, defaultValue) {
  * // => 'default'
  */
 function result(object, path, defaultValue) {
-  if (!isKey(path, object)) {
-    path = baseCastPath(path);
-    var result = get(object, path);
-    object = parent(object, path);
-  } else {
-    result = object == null ? undefined : object[path];
+  path = isKey(path, object) ? [path] : castPath(path);
+
+  var index = -1,
+      length = path.length;
+
+  // Ensure the loop is entered when path is empty.
+  if (!length) {
+    object = undefined;
+    length = 1;
   }
-  if (result === undefined) {
-    result = defaultValue;
+  while (++index < length) {
+    var value = object == null ? undefined : object[path[index]];
+    if (value === undefined) {
+      index = length;
+      value = defaultValue;
+    }
+    object = isFunction(value) ? value.call(object) : value;
   }
-  return isFunction(result) ? result.call(object) : result;
+  return object;
 }
 
 module.exports = result;