Merge pull request #2177 from vsemozhetbyt/patch-3

Make code example more realistic and safe

Author: iliakan

1-js/05-data-types/05-array-methods/article.md

@@ -426,6 +426,7 @@ By the way, if we ever want to know which elements are compared -- nothing preve
 ```js run
 [1, -2, 15, 2, 0, 8].sort(function(a, b) {
   alert( a + " <> " + b );
+  return a - b;
 });
 ```