Update sdbm-hash.md

snippets/sdbm-hash.md

@@ -4,7 +4,7 @@ It uses the charCodeAt-methode and the shift-operator.
 
 ``` js
 function sdbm(s) {
-    var hashCode = new Number();
+    var hashCode = 0;
     for (var i = 0; i < s.length; i++) {
         hashCode = s.charCodeAt(i) + (hashCode << 6) + (hashCode << 16) - hashCode;
     }