Bump to v4.0.0.

lodash.functions/index.js

@@ -1,31 +1,117 @@
 /**
- * lodash 3.0.0 (Custom Build) <https://lodash.com/>
- * Build: `lodash modern modularize exports="npm" -o ./`
- * Copyright 2012-2015 The Dojo Foundation <http://dojofoundation.org/>
- * Based on Underscore.js 1.7.0 <http://underscorejs.org/LICENSE>
- * Copyright 2009-2015 Jeremy Ashkenas, DocumentCloud and Investigative Reporters & Editors
+ * lodash 4.0.0 (Custom Build) <https://lodash.com/>
+ * Build: `lodash modularize exports="npm" -o ./`
+ * Copyright 2012-2016 The Dojo Foundation <http://dojofoundation.org/>
+ * 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>
  */
-var baseFunctions = require('lodash._basefunctions'),
-    keysIn = require('lodash.keysin');
+var arrayFilter = require('lodash._arrayfilter'),
+    keys = require('lodash.keys');
+
+/** `Object#toString` result references. */
+var funcTag = '[object Function]',
+    genTag = '[object GeneratorFunction]';
+
+/** Used for built-in method references. */
+var objectProto = global.Object.prototype;
 
 /**
- * Creates an array of function property names from all enumerable properties,
- * own and inherited, of `object`.
+ * Used to resolve the [`toStringTag`](http://ecma-international.org/ecma-262/6.0/#sec-object.prototype.tostring)
+ * of values.
+ */
+var objectToString = objectProto.toString;
+
+/**
+ * The base implementation of `_.functions` which creates an array of
+ * `object` function property names filtered from those provided.
+ *
+ * @private
+ * @param {Object} object The object to inspect.
+ * @param {Array} props The property names to filter.
+ * @returns {Array} Returns the new array of filtered property names.
+ */
+function baseFunctions(object, props) {
+  return arrayFilter(props, function(key) {
+    return isFunction(object[key]);
+  });
+}
+
+/**
+ * Checks if `value` is classified as a `Function` object.
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is correctly classified, else `false`.
+ * @example
+ *
+ * _.isFunction(_);
+ * // => true
+ *
+ * _.isFunction(/abc/);
+ * // => false
+ */
+function isFunction(value) {
+  // The use of `Object#toString` avoids issues with the `typeof` operator
+  // in Safari 8 which returns 'object' for typed array constructors, and
+  // PhantomJS 1.9 which returns 'function' for `NodeList` instances.
+  var tag = isObject(value) ? objectToString.call(value) : '';
+  return tag == funcTag || tag == genTag;
+}
+
+/**
+ * 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('')`)
+ *
+ * @static
+ * @memberOf _
+ * @category Lang
+ * @param {*} value The value to check.
+ * @returns {boolean} Returns `true` if `value` is an object, else `false`.
+ * @example
+ *
+ * _.isObject({});
+ * // => true
+ *
+ * _.isObject([1, 2, 3]);
+ * // => true
+ *
+ * _.isObject(_.noop);
+ * // => true
+ *
+ * _.isObject(null);
+ * // => false
+ */
+function isObject(value) {
+  var type = typeof value;
+  return !!value && (type == 'object' || type == 'function');
+}
+
+/**
+ * Creates an array of function property names from own enumerable properties
+ * of `object`.
  *
  * @static
  * @memberOf _
- * @alias methods
  * @category Object
  * @param {Object} object The object to inspect.
  * @returns {Array} Returns the new array of property names.
  * @example
  *
- * _.functions(_);
- * // => ['after', 'ary', 'assign', ...]
+ * function Foo() {
+ *   this.a = _.constant('a');
+ *   this.b = _.constant('b');
+ * }
+ *
+ * Foo.prototype.c = _.constant('c');
+ *
+ * _.functions(new Foo);
+ * // => ['a', 'b']
  */
 function functions(object) {
-  return baseFunctions(object, keysIn(object));
+  return object == null ? [] : baseFunctions(object, keys(object));
 }
 
 module.exports = functions;