From fc28d56101cc8f4d4b7a02a2d94ae8e67f7d840d Mon Sep 17 00:00:00 2001
From: Aaron Powell <me@aaron-powell.com>
Date: Sun, 4 Dec 2011 07:17:28 +0000
Subject: [PATCH] implementing letter sequentials

---
 lib/tbd.js | 22 +++++++++++++++++-----
 1 file changed, 17 insertions(+), 5 deletions(-)

diff --git a/lib/tbd.js b/lib/tbd.js
index e160c2d..02471a1 100644
--- a/lib/tbd.js
+++ b/lib/tbd.js
@@ -131,11 +131,23 @@
     };
     
     utils.sequential = function(start) {
-        return function () {
-            var x = start;
-            start++;
-            return x;
-        };
+        if (start.constructor === Number) {
+            return function () {
+                var x = start;
+                start++;
+                return x;
+            };
+        } else if (start.constructor === String) {
+            var letters = 'abcdefghijklmnopqrstuvwxyz'.split('');
+            start = letters.indexOf(start);
+            return function () {
+                var x = start;
+                start++;
+                return letters[x];
+            };
+        } else {
+            throw 'This type is not supported for sequential values at the moment';
+        }
     };
     
     this.tbd.utils = utils;