Bump to v3.0.0.

utility/propertyOf.js

@@ -0,0 +1,26 @@
+/**
+ * The inverse of `_.property`; this method creates a function which returns
+ * the property value of a given key on `object`.
+ *
+ * @static
+ * @memberOf _
+ * @category Utility
+ * @param {Object} object The object to inspect.
+ * @returns {Function} Returns the new function.
+ * @example
+ *
+ * var object = { 'user': 'fred', 'age': 40, 'active': true };
+ * _.map(['active', 'user'], _.propertyOf(object));
+ * // => [true, 'fred']
+ *
+ * var object = { 'a': 3, 'b': 1, 'c': 2 };
+ * _.sortBy(['a', 'b', 'c'], _.propertyOf(object));
+ * // => ['b', 'c', 'a']
+ */
+function propertyOf(object) {
+  return function(key) {
+    return object == null ? undefined : object[key];
+  };
+}
+
+export default propertyOf;