Merge pull request loverajoel#279 from boneskull/issue/42

Modify tip to avoid throwing; closes loverajoel#42
zackhall · Mar 1, 2016 · 5e953b1 · 5e953b1
2 parents 8ef67fc + a50aed8
commit 5e953b1
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/_posts/en/2016-01-06-writing-a-single-method-for-arrays-and-a-single-element.md b/_posts/en/2016-01-06-writing-a-single-method-for-arrays-and-a-single-element.md
@@ -17,14 +17,14 @@ You just have to concat everything into an array first. `Array.concat` will acce
 
 ```javascript
 function printUpperCase(words) {
-  var elements = [].concat(words);
+  var elements = [].concat(words || []);
   for (var i = 0; i < elements.length; i++) {
     console.log(elements[i].toUpperCase());
   }
 }
 ```
 
-`printUpperCase` is now ready to accept a single node or an array of nodes as its parameter.
+`printUpperCase` is now ready to accept a single node or an array of nodes as its parameter.  It also avoids the potential `TypeError` that would be thrown if no parameter was passed.
 
 ```javascript
 printUpperCase("cactus");