Ensure _.find returns undefinedwhen a value cannot be found. [closes #15]

Former-commit-id: e6dc89f98a1df81e1b1d67c5e8f5725e4df3bc5a

lodash.js

@@ -585,6 +585,7 @@
    * // => 2
    */
   var find = createIterator(baseIteratorOptions, {
+    'init': '',
     'inLoop': 'if (callback(collection[index], index, collection)) return collection[index]'
   });
 

test/test.js

@@ -174,6 +174,22 @@
 
   /*--------------------------------------------------------------------------*/
 
+  QUnit.module('lodash.find');
+
+  (function() {
+    var array = [1, 2, 3, 4];
+
+    test('should return found `value`', function() {
+      equal(_.find(array, function(n) { return n > 2; }), 3);
+    });
+
+    test('should return `undefined` if `value` is not found', function() {
+      equal(_.find(array, function(n) { return n == 5; }), undefined);
+    });
+  }());
+
+  /*--------------------------------------------------------------------------*/
+
   QUnit.module('lodash.flatten');
 
   (function() {